NO SOUND OUTPUT IN ALL MODES [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)]

id160309000413


Without Bose® and Without i-stop System

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  ACC relay malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between the following terminals:
•  AUDIO2 7.5 A fuse—Tuner and amp unit (TAU) terminal 2F
•  IG2 30 A fuse—ACC relay terminal D (CX-9 (TC))
•  IG2 30 A fuse—ACC relay terminal C (CX-5 (KF))
―  AUDIO2 7.5 A fuse malfunction
―  IG2 30 A fuse malfunction
―  Open circuit in wiring harness between the following terminals:
•  ACC relay terminal C—Tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  ACC relay terminal D—Tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  Battery positive terminal—ACC relay terminal D (CX-9 (TC))
•  Battery positive terminal—ACC relay terminal C (CX-5 (KF))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground.
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
•  Open circuit in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
―  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B

*1  :CX-9 (TC)
*2  :CX-5 (KF)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 9.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
4
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 11.
5
INSPECT ACC RELAY
•  Remove the ACC relay.
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ACC relay.
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ACC relay normal?
Yes
Replace the ACC relay, then go to Step 11.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
6
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Tuner and amp unit (TAU) terminal 2F
―  ACC relay terminal D*1/C*2
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse and IG2 30 A fuse.
•  Any fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following:
•  AUDIO2 7.5 A fuse—Tuner and amp unit (TAU) terminal 2F
•  IG2 30 A fuse—ACC relay terminal D*1/C*2
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  Any fuse is damaged:
―  Replace the fuse.
•  All fuses are normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following:
•  ACC relay terminal C*1/D*2—Tuner and amp unit (TAU) terminal 2F
•  Battery positive terminal—ACC relay terminal D*1/C*2
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
7
INSPECT WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND FOR OPEN CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
8
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 11.
No
Replace the connectivity master unit (CMU), then go to Step 11.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
9
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 11.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
10
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the tuner and amp unit (TAU) connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
―  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
•  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
•  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
11
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)

*1  :CX-9 (TC)
*2  :CX-5 (KF)

With Bose ® and Without i-stop System

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  ACC relay malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between the following terminals:
•  AUDIO2 7.5 A fuse—Tuner and amp unit (TAU) terminal 2F
•  IG2 30 A fuse—ACC relay terminal D (CX-9 (TC))
•  IG2 30 A fuse—ACC relay terminal C (CX-5 (KF))
―  AUDIO2 7.5 A fuse malfunction
―  IG2 30 A fuse malfunction
―  Open circuit in wiring harness between the following terminals:
•  ACC relay terminal C—Tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  ACC relay terminal D—Tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  Battery positive terminal—ACC relay terminal D (CX-9 (TC))
•  Battery positive terminal—ACC relay terminal C (CX-5 (KF))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground
•  Open circuit in wiring harness between audio amplifier terminal 3B and body ground
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
―  Front center speaker malfunction
―  Rear speaker (LH) malfunction
―  Rear speaker (RH) malfunction
―  Bass-box malfunction
―  Front side speaker (LH) malfunction (CX-9 (TC))
―  Front side speaker (RH) malfunction (CX-9 (TC))
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
Possible Causes
•  Short to ground in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))

*1  :CX-9 (TC)
*2  :CX-5 (KF)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 12.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
4
INSPECT AUDIO AMPLIFIER CONNECTOR
•  Disconnect the audio amplifier connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
5
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
6
INSPECT ACC RELAY
•  Remove the ACC relay.
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ACC relay.
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ACC relay normal?
Yes
Replace the ACC relay, then go to Step 15.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
7
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Tuner and amp unit (TAU) terminal 2F
―  ACC relay terminal D (CX-9 (TC))
―  ACC relay terminal C (CX-5 (KF))
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse and IG2 30 A fuse.
•  Any fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following:
•  AUDIO2 7.5 A fuse—Tuner and amp unit (TAU) terminal 2F
•  IG2 30 A fuse—ACC relay terminal D (CX-9 (TC))
•  IG2 30 A fuse—ACC relay terminal C (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  Any fuse is damaged:
―  Replace the fuse.
•  All fuses are normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following:
•  ACC relay terminal C—Tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  ACC relay terminal D—Tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  Battery positive terminal—ACC relay terminal D (CX-9 (TC))
•  Battery positive terminal—ACC relay terminal C (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
8
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect the wiring harness for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
9
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN AUDIO AMPLIFIER AND BODY GROUND
•  Verify that the audio amplifier connectors are disconnected.
•  Inspect the wiring harness for continuity between audio amplifier terminal 3B (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between audio amplifier terminal 3B and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
10
DETERMINE IF MALFUNCTION CAUSE IS AUDIO AMPLIFIER
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the audio amplifier.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 15.
No
Go to the next step.
11
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 15.
No
Replace the connectivity master unit (CMU), then go to Step 15.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
12
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [BASS-BOX SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR SPEAKER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 15.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [BASS-BOX REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
13
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the audio amplifier connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
•  Audio amplifier terminal 3C—Tweeter (LH) terminal B
•  Audio amplifier terminal 3D—Tweeter (LH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
•  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
13
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
•  Is there continuity?
No
•  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
14
INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND
•  Verify that the connector of the malfunctioning speaker and the audio amplifier connector are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning and body ground.
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
―  Tweeter (LH) terminal B
―  Tweeter (LH) terminal A
―  Front door speaker (RH) terminal B
―  Front door speaker (RH) terminal C
―  Tweeter (RH) terminal B
―  Tweeter (RH) terminal A
―  Rear door speaker (LH) terminal B
―  Rear door speaker (LH) terminal C
―  Rear door speaker (RH) terminal C
―  Rear door speaker (RH) terminal B
―  Front center speaker terminal B
―  Front center speaker terminal A
―  Front side speaker (LH) terminal B (CX-9 (TC))
―  Front side speaker (LH) terminal A (CX-9 (TC))
―  Front side speaker (RH) terminal B (CX-9 (TC))
―  Front side speaker (RH) terminal A (CX-9 (TC))
―  Rear speaker (LH) terminal B
―  Rear speaker (LH) terminal A
―  Rear speaker (RH) terminal B
―  Rear speaker (RH) terminal A
―  Bass-box terminal A
―  Bass-box terminal E
―  Bass-box terminal F
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
•  Audio amplifier terminal 3C—Tweeter (LH) terminal B
•  Audio amplifier terminal 3D—Tweeter (LH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
•  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
14
•  Is there continuity?
Yes
•  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
Go to the next step.
No
Go to the next step.
15
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)


Without Bose®, With i-stop System and Without i-ELOOP

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  Ignition relay (ACC_STAB) malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
―  AUDIO2 7.5 A fuse malfunction
―  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF) or CX-8 (KG))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF) or CX-8 (KG))
•  DC-DC converter malfunction
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
•  Open circuit in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
―  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B

*1  :CX-9 (TC)
*2  :CX-5 (KF) or CX-8 (KG)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 13.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
4
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
5
INSPECT DC-DC CONVERTER CONNECTOR
•  Disconnect the DC-DC converter connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
6
INSPECT IGNITION RELAY (ACC_STAB)
•  Remove the ignition relay (ACC_STAB).
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ignition relay (ACC_STAB).
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ignition relay (ACC_STAB) normal?
Yes
Replace the ignition relay (ACC_STAB), then go to Step 15.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
7
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
8
INSPECT WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND FOR OPEN CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
9
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR SHORT TO GROUND
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 15.
No
Go to the next step.
10
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR OPEN CIRCUIT
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) (wiring harness side) and tuner and amp unit (TAU) terminal 2F (wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
11
INSPECT DC-DC CONVERTER
•  Inspect DC-DC converter.
(Refer to the [DC-DC CONVERTER INSPECTION] in the workshop manual.)
•  Is the DC-DC converter normal?
Yes
Go to the next step.
No
Replace the DC-DC converter, then go to Step 15.
(Refer to the [DC-DC CONVERTER REMOVAL/INSTALLATION] in the workshop manual.)
12
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 15.
No
Replace the connectivity master unit (CMU), then go to Step 15.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
13
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 15.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
14
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the tuner and amp unit (TAU) connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
―  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
•  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
•  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
15
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)


With Bose ® , With i-stop System and Without i-ELOOP


L.H.D

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  Ignition relay (ACC_STAB) malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal D (CX-5 (KF))
―  AUDIO2 7.5 A fuse malfunction
―  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay (ACC_STAB) terminal D (CX-5 (KF))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground
•  Open circuit in wiring harness between audio amplifier terminal 3B and body ground
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  DC-DC converter malfunction
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
―  Front center speaker malfunction
―  Rear speaker (LH) malfunction
―  Rear speaker (RH) malfunction
―  Bass-box malfunction
―  Front side speaker (LH) malfunction (CX-9 (TC))
―  Front side speaker (RH) malfunction (CX-9 (TC))
Possible Causes
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
Possible Causes
•  Short to ground in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))

*1  :CX-9 (TC)
*2  :CX-5 (KF)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 16.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
4
INSPECT AUDIO AMPLIFIER CONNECTOR
•  Disconnect the audio amplifier connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
5
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
6
INSPECT DC-DC CONVERTER CONNECTOR
•  Disconnect the DC-DC converter connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
7
INSPECT IGNITION RELAY (ACC_STAB) RELAY
•  Remove the ignition relay (ACC_STAB).
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ignition relay (ACC_STAB).
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ignition relay (ACC_STAB) normal?
Yes
Replace the ignition relay (ACC_STAB), then go to Step 19.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
8
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
9
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect the wiring harness for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
10
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN AUDIO AMPLIFIER AND BODY GROUND
•  Verify that the audio amplifier connectors are disconnected.
•  Inspect the wiring harness for continuity between audio amplifier terminal 3B (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between audio amplifier terminal 3B and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
11
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR SHORT TO GROUND
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D*1/C*2 (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D*1/C*2 and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 19.
No
Go to the next step.
12
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR OPEN CIRCUIT
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D*1/C*2 (wiring harness side) and tuner and amp unit (TAU) terminal 2F (wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D*1/C*2 and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
13
INSPECT DC-DC CONVERTER
•  Inspect DC-DC converter.
(Refer to the [DC-DC CONVERTER INSPECTION] in the workshop manual.)
•  Is the DC-DC converter normal?
Yes
Go to the next step.
No
Replace the DC-DC converter, then go to Step 19.
(Refer to the [DC-DC CONVERTER REMOVAL/INSTALLATION] in the workshop manual.)
14
DETERMINE IF MALFUNCTION CAUSE IS AUDIO AMPLIFIER
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the audio amplifier.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Go to the next step.
15
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Replace the connectivity master unit (CMU), then go to Step 19.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
16
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [BASS-BOX SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR SPEAKER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 19.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [BASS-BOX REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
17
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the audio amplifier connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
•  Audio amplifier terminal 3C—Tweeter (LH) terminal B
•  Audio amplifier terminal 3D—Tweeter (LH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
•  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
17
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
•  Is there continuity?
No
•  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
18
INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND
•  Verify that the connector of the malfunctioning speaker and the audio amplifier connector are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning and body ground.
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
―  Tweeter (LH) terminal B
―  Tweeter (LH) terminal A
―  Front door speaker (RH) terminal B
―  Front door speaker (RH) terminal C
―  Tweeter (RH) terminal B
―  Tweeter (RH) terminal A
―  Rear door speaker (LH) terminal B
―  Rear door speaker (LH) terminal C
―  Rear door speaker (RH) terminal C
―  Rear door speaker (RH) terminal B
―  Front center speaker terminal B
―  Front center speaker terminal A
―  Front side speaker (LH) terminal B (CX-9 (TC))
―  Front side speaker (LH) terminal A (CX-9 (TC))
―  Front side speaker (RH) terminal B (CX-9 (TC))
―  Front side speaker (RH) terminal A (CX-9 (TC))
―  Rear speaker (LH) terminal B
―  Rear speaker (LH) terminal A
―  Rear speaker (RH) terminal B
―  Rear speaker (RH) terminal A
―  Bass-box terminal A
―  Bass-box terminal E
―  Bass-box terminal F
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
•  Audio amplifier terminal 3C—Tweeter (LH) terminal B
•  Audio amplifier terminal 3D—Tweeter (LH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 3G—Front door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
•  Audio amplifier terminal 3H—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2A—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
18
•  Is there continuity?
Yes
•  Audio amplifier terminal 2E—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (RH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
Go to the next step.
No
Go to the next step.
19
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)

*1  :CX-9 (TC)
*2  :CX-5 (KF)


R.H.D

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  Ignition relay (ACC_STAB) malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
―  AUDIO2 7.5 A fuse malfunction
―  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Open circuit in wiring harness between DC-DC converter terminal K and ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground
•  Open circuit in wiring harness between audio amplifier terminal 3B and body ground
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF) or CX-8 (KG))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF) or CX-8 (KG))
•  DC-DC converter malfunction
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Rear door speaker (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Front center speaker malfunction
―  Rear speaker (LH) malfunction
―  Rear speaker (RH) malfunction
―  Bass-box malfunction
―  Front side speaker (RH) malfunction (CX-9 (TC))
―  Front side speaker (LH) malfunction (CX-9 (TC))
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3C—Tweeter (RH) terminal B
―  Audio amplifier terminal 3D—Tweeter (RH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
Possible Causes
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 3E—Bass-box terminal D (CX-8 (KG))
―  Audio amplifier terminal 3F—Bass-box terminal B (CX-8 (KG))
―  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
•  Short to ground in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3C—Tweeter (RH) terminal B
―  Audio amplifier terminal 3D—Tweeter (RH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 3E—Bass-box terminal D (CX-8 (KG))
―  Audio amplifier terminal 3F—Bass-box terminal B (CX-8 (KG))
―  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))

*1  :CX-9 (TC)
*2  :CX-5 (KF) or CX-8 (KG)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 16.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
4
INSPECT AUDIO AMPLIFIER CONNECTOR
•  Disconnect the audio amplifier connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
5
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
6
INSPECT DC-DC CONVERTER CONNECTOR
•  Disconnect the DC-DC converter connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
7
INSPECT IGNITION RELAY (ACC_STAB) RELAY
•  Remove the ignition relay (ACC_STAB).
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ignition relay (ACC_STAB).
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ignition relay (ACC_STAB) normal?
Yes
Replace the ignition relay (ACC_STAB), then go to Step 19.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
8
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal D (CX-5 (KF) or CX-8 (KG))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
9
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect the wiring harness for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
10
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN AUDIO AMPLIFIER AND BODY GROUND
•  Verify that the audio amplifier connectors are disconnected.
•  Inspect the wiring harness for continuity between audio amplifier terminal 3B (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between audio amplifier terminal 3B and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
11
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR SHORT TO GROUND
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 19.
No
Go to the next step.
12
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR OPEN CIRCUIT
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) (wiring harness side) and tuner and amp unit (TAU) terminal 2F (wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D (CX-9 (TC))/C (CX-5 (KF) or CX-8 (KG)) and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
13
INSPECT DC-DC CONVERTER
•  Inspect DC-DC converter.
(Refer to the [DC-DC CONVERTER INSPECTION] in the workshop manual.)
•  Is the DC-DC converter normal?
Yes
Go to the next step.
No
Replace the DC-DC converter, then go to Step 19.
(Refer to the [DC-DC CONVERTER REMOVAL/INSTALLATION] in the workshop manual.)
14
DETERMINE IF MALFUNCTION CAUSE IS AUDIO AMPLIFIER
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the audio amplifier.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Go to the next step.
15
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Replace the connectivity master unit (CMU), then go to Step 19.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
16
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [BASS-BOX SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR SPEAKER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 19.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [BASS-BOX REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
17
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the audio amplifier connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3C—Tweeter (RH) terminal B
―  Audio amplifier terminal 3D—Tweeter (RH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
•  Audio amplifier terminal 3C—Tweeter (RH) terminal B
•  Audio amplifier terminal 3D—Tweeter (RH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
17
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 3E—Bass-box terminal D (CX-8 (KG))
―  Audio amplifier terminal 3F—Bass-box terminal B (CX-8 (KG))
―  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
•  Is there continuity?
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
•  Audio amplifier terminal 3E—Bass-box terminal D (CX-8 (KG))
•  Audio amplifier terminal 3F—Bass-box terminal B (CX-8 (KG))
•  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
18
INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND
•  Verify that the connector of the malfunctioning speaker and the audio amplifier connector are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning and body ground.
―  Front door speaker (RH) terminal B
―  Front door speaker (RH) terminal C
―  Tweeter (RH) terminal B
―  Tweeter (RH) terminal A
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
―  Tweeter (LH) terminal B
―  Tweeter (LH) terminal A
―  Rear door speaker (RH) terminal B
―  Rear door speaker (RH) terminal C
―  Rear door speaker (LH) terminal C
―  Rear door speaker (LH) terminal B
―  Front center speaker terminal B
―  Front center speaker terminal A
―  Front side speaker (LH) terminal B (CX-9 (TC))
―  Front side speaker (LH) terminal A (CX-9 (TC))
―  Front side speaker (RH) terminal B (CX-9 (TC))
―  Front side speaker (RH) terminal A (CX-9 (TC))
―  Rear speaker (LH) terminal B
―  Rear speaker (LH) terminal A
―  Rear speaker (RH) terminal B
―  Rear speaker (RH) terminal A
―  Bass-box terminal A (CX-9 (TC) or CX-5 (KF))
―  Bass-box terminal B (CX-5 (KF) or CX-8 (KG))
―  Bass-box terminal D (CX-8 (KG))
―  Bass-box terminal E (CX-9 (TC))
―  Bass-box terminal F (CX-9 (TC))
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
•  Audio amplifier terminal 3C—Tweeter (RH) terminal B
•  Audio amplifier terminal 3D—Tweeter (RH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF) or CX-8 (KG))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
18
•  Is there continuity?
Yes
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
•  Audio amplifier terminal 3E—Bass-box terminal D (CX-8 (KG))
•  Audio amplifier terminal 3F—Bass-box terminal B (CX-8 (KG))
•  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
Go to the next step.
No
Go to the next step.
19
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)


Without Bose®, With i-stop System and With i-ELOOP

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  Ignition relay (ACC_STAB) malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal D (CX-5 (KF))
―  AUDIO2 7.5 A fuse malfunction
―  Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 4A and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 2A and ignition relay (ACC_STAB) terminal D (CX-5 (KF))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground.
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  DC-DC converter (i-ELOOP) malfunction
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
•  Open circuit in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
―  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B

*1  :CX-9 (TC)
*2  :CX-5 (KF)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 13.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
4
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
5
INSPECT DC-DC CONVERTER (i-ELOOP) CONNECTOR
•  Disconnect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the DC-DC converter (i-ELOOP) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 15.
6
INSPECT IGNITION RELAY (ACC_STAB)
•  Remove the ignition relay (ACC_STAB).
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ignition relay (ACC_STAB).
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ignition relay (ACC_STAB) normal?
Yes
Replace the ignition relay (ACC_STAB), then go to Step 15.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
7
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  DC-DC converter (i-ELOOP) terminal 4A—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  DC-DC converter (i-ELOOP) terminal 2A—Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
8
INSPECT WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND FOR OPEN CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
9
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR SHORT TO GROUND
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D*1/C*2 (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D*1/C*2 and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 15.
No
Go to the next step.
10
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR OPEN CIRCUIT
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D*1/C*2 (wiring harness side) and tuner and amp unit (TAU) terminal 2F (wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D*1/C*2 and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 15.
11
INSPECT DC-DC CONVERTER (i-ELOOP)
•  Inspect DC-DC converter (i-ELOOP).
(Refer to the [DC-DC CONVERTER (i-ELOOP) INSPECTION] in the workshop manual.)
•  Is the DC-DC converter (i-ELOOP) normal?
Yes
Go to the next step.
No
Replace the DC-DC converter (i-ELOOP), then go to Step 15.
(Refer to the [DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION] in the workshop manual.)
12
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 15.
No
Replace the connectivity master unit (CMU), then go to Step 15.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
13
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 15.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
14
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the tuner and amp unit (TAU) connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
―  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Tuner and amp unit (TAU) terminal 2N—Front door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2P—Front door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
•  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2Q—Front door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2O—Front door speaker (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2Q—Tweeter (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2O—Tweeter (RH) terminal A
•  Tuner and amp unit (TAU) terminal 2J—Rear door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2L—Rear door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2M—Rear door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2K—Rear door speaker (RH) terminal B
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
15
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)

*1  :CX-9 (TC)
*2  :CX-5 (KF)

With Bose ® , With i-stop System and With i-ELOOP


L.H.D.

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  Ignition relay (ACC_STAB) malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal D
―  AUDIO2 7.5 A fuse malfunction
―  Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 2A and ignition relay (ACC_STAB) terminal D
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground
•  Open circuit in wiring harness between audio amplifier terminal 3B and body ground
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F
•  DC-DC converter (i-ELOOP) malfunction
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
―  Front center speaker malfunction
―  Rear speaker (LH) malfunction
―  Rear speaker (RH) malfunction
―  Bass-box malfunction
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 3E—Bass-box terminal B
―  Audio amplifier terminal 3F—Bass-box terminal A
Possible Causes
•  Short to ground in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 3E—Bass-box terminal B
―  Audio amplifier terminal 3F—Bass-box terminal A

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 16.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
4
INSPECT AUDIO AMPLIFIER CONNECTOR
•  Disconnect the audio amplifier connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
5
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
6
INSPECT DC-DC CONVERTER (i-ELOOP) CONNECTOR
•  Disconnect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the DC-DC converter (i-ELOOP) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
7
INSPECT IGNITION RELAY (ACC_STAB) RELAY
•  Remove the ignition relay (ACC_STAB).
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ignition relay (ACC_STAB).
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ignition relay (ACC_STAB) normal?
Yes
Replace the ignition relay (ACC_STAB), then go to Step 19.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
8
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition relay (ACC_STAB) terminal D
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal D
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  DC-DC converter (i-ELOOP) terminal 2A—Ignition relay (ACC_STAB) terminal D
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
9
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect the wiring harness for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
10
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN AUDIO AMPLIFIER AND BODY GROUND
•  Verify that the audio amplifier connectors are disconnected.
•  Inspect the wiring harness for continuity between audio amplifier terminal 3B (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between audio amplifier terminal 3B and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
11
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR SHORT TO GROUND
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal C (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 19.
No
Go to the next step.
12
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR OPEN CIRCUIT
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal C (wiring harness side) and tuner and amp unit (TAU) terminal 2F (wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
13
INSPECT DC-DC CONVERTER (i-ELOOP)
•  Inspect DC-DC converter (i-ELOOP).
(Refer to the [DC-DC CONVERTER (i-ELOOP) INSPECTION] in the workshop manual.)
•  Is the DC-DC converter (i-ELOOP) normal?
Yes
Go to the next step.
No
Replace the DC-DC converter (i-ELOOP), then go to Step 19.
(Refer to the [DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION] in the workshop manual.)
14
DETERMINE IF MALFUNCTION CAUSE IS AUDIO AMPLIFIER
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the audio amplifier.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Go to the next step.
15
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Replace the connectivity master unit (CMU), then go to Step 19.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
16
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [BASS-BOX SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR SPEAKER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 19.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [BASS-BOX REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
17
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the audio amplifier connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
―  Audio amplifier terminal 3C—Tweeter (LH) terminal B
―  Audio amplifier terminal 3D—Tweeter (LH) terminal A
―  Audio amplifier terminal 3H—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3G—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3E—Tweeter (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (RH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C
―  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B
―  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C
―  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 3E—Bass-box terminal B
―  Audio amplifier terminal 3F—Bass-box terminal A
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
•  Audio amplifier terminal 3C—Tweeter (LH) terminal B
•  Audio amplifier terminal 3D—Tweeter (LH) terminal A
•  Audio amplifier terminal 3H—Front door speaker (RH) terminal C
•  Audio amplifier terminal 3G—Front door speaker (RH) terminal B
•  Audio amplifier terminal 3H—Tweeter (RH) terminal B
•  Audio amplifier terminal 3G—Tweeter (RH) terminal A
•  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C
•  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B
•  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C
•  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 3E—Bass-box terminal B
•  Audio amplifier terminal 3F—Bass-box terminal A
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
18
INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND
•  Verify that the connector of the malfunctioning speaker and the audio amplifier connector are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning and body ground.
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
―  Tweeter (LH) terminal B
―  Tweeter (LH) terminal A
―  Front door speaker (RH) terminal B
―  Front door speaker (RH) terminal C
―  Tweeter (RH) terminal B
―  Tweeter (RH) terminal A
―  Rear door speaker (LH) terminal B
―  Rear door speaker (LH) terminal C
―  Rear door speaker (RH) terminal C
―  Rear door speaker (RH) terminal B
―  Front center speaker terminal B
―  Front center speaker terminal A
―  Front side speaker (LH) terminal B
―  Front side speaker (LH) terminal A
―  Front side speaker (RH) terminal B
―  Front side speaker (RH) terminal A
―  Rear speaker (LH) terminal B
―  Rear speaker (LH) terminal A
―  Rear speaker (RH) terminal B
―  Rear speaker (RH) terminal A
―  Bass-box terminal A
―  Bass-box terminal E
―  Bass-box terminal F
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (LH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (LH) terminal B
•  Audio amplifier terminal 3C—Tweeter (LH) terminal B
•  Audio amplifier terminal 3D—Tweeter (LH) terminal A
•  Audio amplifier terminal 3H—Front door speaker (RH) terminal C
•  Audio amplifier terminal 3G—Front door speaker (RH) terminal B
•  Audio amplifier terminal 3H—Tweeter (RH) terminal B
•  Audio amplifier terminal 3G—Tweeter (RH) terminal A
•  Audio amplifier terminal 2E—Rear door speaker (LH) terminal C
•  Audio amplifier terminal 2C—Rear door speaker (LH) terminal B
•  Audio amplifier terminal 2M—Rear door speaker (RH) terminal C
•  Audio amplifier terminal 2K—Rear door speaker (RH) terminal B
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 3E—Bass-box terminal B
•  Audio amplifier terminal 3F—Bass-box terminal A
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
Go to the next step.
19
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)


R.H.D.

Description
NO SOUND OUTPUT IN ALL MODES
•  Sound is not output from speakers even if any mode is selected
Possible Causes
•  DTCs are stored in the Mazda ERA-GLONASS control module. (With Mazda ERA-GLONASS)
•  Connector poor contact or terminal damage
•  Ignition relay (ACC_STAB) malfunction
•  Tuner and amp unit (TAU) ACC power supply circuit malfunction
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Short circuit to ground in wiring harness between AUDIO2 7.5 A fuse and ignition relay (ACC_STAB) terminal D (CX-5 (KF))
―  AUDIO2 7.5 A fuse malfunction
―  Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 4A and ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 2A and ignition relay (ACC_STAB) terminal D (CX-5 (KF))
•  Open circuit in wiring harness between tuner and amp unit (TAU) terminal 2A and body ground
•  Open circuit in wiring harness between audio amplifier terminal 3B and body ground
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Short circuit to ground in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal D and tuner and amp unit (TAU) terminal 2F (CX-9 (TC))
•  Open circuit in wiring harness between ignition relay (ACC_STAB) terminal C and tuner and amp unit (TAU) terminal 2F (CX-5 (KF))
•  DC-DC converter (i-ELOOP) malfunction
•  Tuner and amp unit (TAU) malfunction
•  Connectivity master unit (CMU) malfunction
•  Speaker malfunction
―  Front door speaker (LH) malfunction
―  Tweeter (LH) malfunction
―  Front door speaker (RH) malfunction
―  Tweeter (RH) malfunction
―  Rear door speaker (LH) malfunction
―  Rear door speaker (RH) malfunction
―  Front center speaker malfunction
―  Rear speaker (LH) malfunction
―  Rear speaker (RH) malfunction
―  Bass-box malfunction
―  Front side speaker (LH) malfunction (CX-9 (TC))
―  Front side speaker (RH) malfunction (CX-9 (TC))
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3C—Tweeter (RH) terminal B
―  Audio amplifier terminal 3D—Tweeter (RH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
Possible Causes
•  Open circuit in wiring harness between the following terminals:
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
•  Short to ground in wiring harness between the following terminals:
―  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3C—Tweeter (RH) terminal B
―  Audio amplifier terminal 3D—Tweeter (RH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
―  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))

*1  :CX-9 (TC)
*2  :CX-5 (KF)

Diagnostic procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
•  System is normal.
•  Due to the possibility that sound is not output in some modes, verify the malfunction in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
No
•  No sound is produced from all speakers
With Mazda ERA-GLONASS
―  Go to the next step.
Without Mazda ERA-GLONASS
―  Go to Step 3.
•  No sound is produced from some speakers
―  Go to Step 16.
2
VERIFY Mazda ERA-GLONASS CONTROL MODULE DTCs
•  Retrieve the Mazda ERA-GLONASS control module DTCs using the M-MDS.
(Refer to the [DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE]] in the workshop manual.)
No
Go to the next step.
3
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the tuner and amp unit (TAU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
4
INSPECT AUDIO AMPLIFIER CONNECTOR
•  Disconnect the audio amplifier connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
5
INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR
•  Disconnect the connectivity master unit (CMU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
6
INSPECT DC-DC CONVERTER (i-ELOOP) CONNECTOR
•  Disconnect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Disconnect the DC-DC converter (i-ELOOP) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 19.
7
INSPECT IGNITION RELAY (ACC_STAB) RELAY
•  Remove the ignition relay (ACC_STAB).
(Refer to the [RELAY LOCATION] in the workshop manual.)
•  Inspect the ignition relay (ACC_STAB).
(Refer to the [RELAY INSPECTION] in the workshop manual.)
•  Is the ignition relay (ACC_STAB) normal?
Yes
Replace the ignition relay (ACC_STAB), then go to Step 19.
(Refer to the [RELAY LOCATION] in the workshop manual.)
No
Go to the next step.
8
INSPECT TUNER AND AMP UNIT (TAU) ACC POWER SUPPLY VOLTAGE
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the AUDIO2 7.5 A fuse.
•  If the fuse is blown:
―  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
―  AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  DC converter (i-ELOOP) terminal 4A—Ignition relay (ACC_STAB) terminal C (CX-9 (TC))
•  DC converter (i-ELOOP) terminal 2A—Ignition relay (ACC_STAB) terminal D (CX-5 (KF))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
9
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN TUNER AND AMP UNIT (TAU) AND BODY GROUND
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect the wiring harness for continuity between tuner and amp unit (TAU) terminal 2A (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the tuner and amp unit (TAU) terminal 2A and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
10
VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN AUDIO AMPLIFIER AND BODY GROUND
•  Verify that the audio amplifier connectors are disconnected.
•  Inspect the wiring harness for continuity between audio amplifier terminal 3B (wiring harness side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between audio amplifier terminal 3B and body ground.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
11
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR SHORT TO GROUND
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D*1/C*2 (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D*1/C*2 and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 19.
No
Go to the next step.
12
INSPECT WIRING HARNESS BETWEEN IGNITION RELAY (ACC_STAB) AND TUNER AND AMP UNIT (TAU) FOR OPEN CIRCUIT
•  Verify that the ignition relay (ACC_STAB) is removed.
•  Verify that the tuner and amp unit (TAU) connector is disconnected.
•  Inspect for continuity between ignition relay (ACC_STAB) terminal D*1/C*2 (wiring harness side) and tuner and amp unit (TAU) terminal 2F (wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between ignition relay (ACC_STAB) terminal D*1/C*2 and tuner and amp unit (TAU) terminal 2F.
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
Repair or replace the malfunctioning location.
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
13
INSPECT DC-DC CONVERTER (i-ELOOP)
•  Inspect DC-DC converter (i-ELOOP).
(Refer to the [DC-DC CONVERTER (i-ELOOP) INSPECTION] in the workshop manual.)
•  Is the DC-DC converter (i-ELOOP) normal?
Yes
Go to the next step.
No
Replace the DC-DC converter (i-ELOOP), then go to Step 19.
(Refer to the [DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION] in the workshop manual.)
14
DETERMINE IF MALFUNCTION CAUSE IS AUDIO AMPLIFIER
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the audio amplifier.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Go to the next step.
15
DETERMINE IF MALFUNCTION CAUSE IS TUNER AND AMP UNIT (TAU)
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION [TYPE-A]] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Go to Step 19.
No
Replace the connectivity master unit (CMU), then go to Step 19.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual.)
16
INSPECT SPEAKERS
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Inspect the malfunctioning speaker.
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [TWEETER INSPECTION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [BASS-BOX SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER INSPECTION] in the workshop manual.)
(Refer to the [REAR SPEAKER INSPECTION] in the workshop manual.)
•  Is the speaker resistance normal?
Yes
Go to the next step.
No
Replace the malfunctioning speaker, then go to Step 19.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [BASS-BOX REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT CENTER SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [FRONT SIDE SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
(Refer to the [REAR SPEAKER REMOVAL/INSTALLATION] in the workshop manual.)
17
INSPECT SPEAKER CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the connector of the malfunctioning speaker and the audio amplifier connector.
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
―  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
―  Audio amplifier terminal 3C—Tweeter (RH) terminal B
―  Audio amplifier terminal 3D—Tweeter (RH) terminal A
―  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF))
―  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
―  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF))
―  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF))
―  Audio amplifier terminal 2G—Front center speaker terminal B
―  Audio amplifier terminal 2I—Front center speaker terminal A
―  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
―  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
―  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
―  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
―  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
―  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
―  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
―  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
•  Audio amplifier terminal 3C—Tweeter (RH) terminal B
•  Audio amplifier terminal 3D—Tweeter (RH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF))
•  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
17
•  Verify the continuity of the wiring harness between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning.
―  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
―  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
―  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
•  Is there continuity?
No
•  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 19.
18
INSPECT SPEAKER CIRCUIT FOR SHORT TO GROUND
•  Verify that the connector of the malfunctioning speaker and the audio amplifier connector are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) of the speakers which are malfunctioning and body ground.
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
―  Tweeter (LH) terminal B
―  Tweeter (LH) terminal A
―  Front door speaker (RH) terminal B
―  Front door speaker (RH) terminal C
―  Tweeter (RH) terminal B
―  Tweeter (RH) terminal A
―  Rear door speaker (LH) terminal B
―  Rear door speaker (LH) terminal C
―  Rear door speaker (RH) terminal C
―  Rear door speaker (RH) terminal B
―  Front center speaker terminal B
―  Front center speaker terminal A
―  Rear speaker (LH) terminal B
―  Rear speaker (LH) terminal A
―  Rear speaker (RH) terminal B
―  Rear speaker (RH) terminal A
―  Bass-box terminal A
―  Bass-box terminal E
―  Bass-box terminal F
―  Front side speaker (RH) terminal B (CX-9 (TC))
―  Front side speaker (RH) terminal A (CX-9 (TC))
―  Front side speaker (LH) terminal B (CX-9 (TC))
―  Front side speaker (LH) terminal A (CX-9 (TC))
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Audio amplifier terminal 3C—Front door speaker (RH) terminal C
•  Audio amplifier terminal 3D—Front door speaker (RH) terminal B
•  Audio amplifier terminal 3C—Tweeter (RH) terminal B
•  Audio amplifier terminal 3D—Tweeter (RH) terminal A
•  Audio amplifier terminal 3E—Front door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3F—Front door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3H—Front door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 3G—Front door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3E—Tweeter (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 3F—Tweeter (LH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 3H—Tweeter (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 3G—Tweeter (LH) terminal A (CX-5 (KF))
•  Audio amplifier terminal 3H—Rear door speaker (RH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 3G—Rear door speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2E—Rear door speaker (RH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2C—Rear door speaker (RH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2A—Rear door speaker (LH) terminal C (CX-9 (TC))
•  Audio amplifier terminal 2B—Rear door speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2M—Rear door speaker (LH) terminal C (CX-5 (KF))
•  Audio amplifier terminal 2K—Rear door speaker (LH) terminal B (CX-5 (KF))
•  Audio amplifier terminal 2G—Front center speaker terminal B
•  Audio amplifier terminal 2I—Front center speaker terminal A
•  Audio amplifier terminal 2O—Rear speaker (LH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (LH) terminal A
•  Audio amplifier terminal 2O—Rear speaker (RH) terminal B
•  Audio amplifier terminal 2P—Rear speaker (RH) terminal A
•  Audio amplifier terminal 2F—Bass-box terminal A (CX-9 (TC))
•  Audio amplifier terminal 1A—Bass-box terminal E (CX-9 (TC))
•  Audio amplifier terminal 1B—Bass-box terminal F (CX-9 (TC))
•  Audio amplifier terminal 3E—Bass-box terminal B (CX-5 (KF))
•  Audio amplifier terminal 3F—Bass-box terminal A (CX-5 (KF))
18
•  Is there continuity?
Yes
•  Audio amplifier terminal 2E—Front side speaker (RH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2C—Front side speaker (RH) terminal A (CX-9 (TC))
•  Audio amplifier terminal 2M—Front side speaker (LH) terminal B (CX-9 (TC))
•  Audio amplifier terminal 2K—Front side speaker (LH) terminal A (CX-9 (TC))
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground.
Go to the next step.
No
Go to the next step.
19
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect all the connectors.
•  Reconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual.)
•  Connect the service plug.
(Refer to the [SERVICE PLUG DISCONNECTION/CONNECTION] in the workshop manual.)
•  Switch the ignition to ACC or ON (engine off or on).
•  Launch the on-board diagnostic assist function.
•  Select assist code “94”.
•  Press the [ENTER] and verify that the sound is output from each speaker.
•  Is sound output from each speaker in the order?
Yes
Troubleshooting completed (explain the contents of the servicing to the customer).
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM (WITH CENTER DISPLAY) (TYPE-A) (E)].)

*1  :CX-9 (TC)
*2  :CX-5 (KF)