DTC B1238:01 [CONNECTIVITY MASTER UNIT (TYPE-A)]

id1602a8014000


Without Bose®

Description

Speaker circuit malfunction
Detection condition
•  The connectivity master unit (CMU) detected a short to ground or short to power supply in the speaker circuit with the ignition switched ON (engine off or on).
Fail-safe
Not applicable
Possible cause
•  Tuner and amp unit (TAU) connector or terminal malfunction
•  Front door speaker (LH) connector or terminal malfunction
•  Tweeter (LH) connector or terminal malfunction (with tweeter (LH))
•  Short to ground 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 (with tweeter (LH))
―  Tuner and amp unit (TAU) terminal 2P―Tweeter (LH) terminal B (with tweeter (LH))
•  Short to power supply 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 (with tweeter (LH))
―  Tuner and amp unit (TAU) terminal 2P―Tweeter (LH) terminal B (with tweeter (LH))
•  Front door speaker (LH) malfunction
•  Tweeter (LH) malfunction (with tweeter (LH))
•  Front door speaker (RH) connector or terminal malfunction
•  Tweeter (RH) connector or terminal malfunction (with tweeter (RH))
•  Short to ground in wiring harness between the following terminals:
―  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 (with tweeter (RH))
―  Tuner and amp unit (TAU) terminal 2O―Tweeter (RH) terminal A (with tweeter (RH))
•  Short to power supply in wiring harness between the following terminals:
―  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 (with tweeter (RH))
―  Tuner and amp unit (TAU) terminal 2O―Tweeter (RH) terminal A (with tweeter (RH))
•  Front door speaker (RH) malfunction
•  Tweeter (RH) malfunction (with tweeter (RH))
•  Rear door speaker (LH) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2L―Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2J―Rear door speaker (LH) terminal B
•  Short to power supply in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2L―Rear door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2J―Rear door speaker (LH) terminal B
•  Rear door speaker (LH) malfunction
•  Rear door speaker (RH) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  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
•  Short to power supply in wiring harness between the following terminals:
―  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
•  Rear door speaker (RH) malfunction
•  Tuner and amp unit (TAU) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
DETERMINE MALFUNCTIONING SPEAKER
•  Perform diagnostic assist code “94” speaker inspection.
•  Is audio produced from each speaker in order?
Yes
Go to Step 27.
No
No audio produced from front door speaker (LH) and tweeter (LH) (with tweeter (LH))
•  Go to the next step.
No audio produced from front door speaker (RH) and tweeter (RH) (with tweeter (RH))
•  Go to Step 9.
No sound produced from rear door speaker (LH)
•  Go to Step 16.
No audio produced from rear door speaker (RH)
•  Go to Step 21.
No audio produced from all speakers.
•  Go to Step 26.
2
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  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 27.
3
INSPECT FRONT DOOR SPEAKER (LH) CONNECTOR CONDITION
•  Disconnect the front door speaker (LH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Without tweeter (LH):
•  Go to Step 5.
With tweeter (LH):
•  Go to the next step.
No
Repair or replace the connector, then go to Step 27.
4
INSPECT TWEETER (LH) CONNECTOR CONDITION
•  Disconnect the tweeter (LH) 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 27.
5
INSPECT FRONT DOOR SPEAKER (LH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the following connectors are disconnected.
―  Tuner and amp unit (TAU)
―  Front door speaker (LH)
―  Tweeter (LH) (with tweeter (LH))
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
•  Is there continuity?
Yes
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 (with tweeter (LH))
•  Tuner and amp unit (TAU) terminal 2P―Tweeter (LH) terminal B (with tweeter (LH))
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 27.
No
Go to the next step.
6
INSPECT FRONT DOOR SPEAKER (LH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the following connectors are disconnected.
―  Tuner and amp unit (TAU)
―  Front door speaker (LH)
―  Tweeter (LH) (with tweeter (LH))
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)]
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Front door speaker (LH) terminal B
―  Front door speaker (LH) terminal C
•  Is the voltage 0 V?
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 (with tweeter (LH))
•  Tuner and amp unit (TAU) terminal 2P―Tweeter (LH) terminal B (with tweeter (LH))
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 27.
7
INSPECT FRONT DOOR SPEAKER (LH)
•  Inspect the front door speaker (LH).
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual)
•  Is the front door speaker (LH) normal?
Yes
Without tweeter (LH):
•  Go to Step 27.
With tweeter (LH):
•  Go to the next step.
No
Replace the front door speaker (LH), then go to Step 27.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual)
8
INSPECT TWEETER (LH)
•  Inspect the tweeter (LH)
(Refer to the [TWEETER INSPECTION] in the workshop manual)
•  Is the tweeter (LH) normal?
Yes
Go to Step 27.
No
Replace the tweeter (LH), then go to Step 27.
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual)
9
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  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 27.
10
INSPECT FRONT DOOR SPEAKER (RH) CONNECTOR CONDITION
•  Disconnect the front door speaker (RH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Without tweeter (RH):
•  Go to Step 12.
With tweeter (RH):
•  Go to the next step.
No
Repair or replace the connector, then go to Step 27.
11
INSPECT TWEETER (RH) CONNECTOR CONDITION
•  Disconnect the tweeter (RH) 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 27.
12
INSPECT FRONT DOOR SPEAKER (RH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the following connectors are disconnected.
―  Tuner and amp unit (TAU)
―  Front door speaker (RH)
―  Tweeter (RH) (with tweeter (RH))
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Front door speaker (RH) terminal C
―  Front door speaker (RH) terminal B
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals:
•  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 (with tweeter (RH))
•  Tuner and amp unit (TAU) terminal 2O―Tweeter (RH) terminal A (with tweeter (RH))
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 27.
No
Go to the next step.
13
INSPECT FRONT DOOR SPEAKER (RH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the following connectors are disconnected.
―  Tuner and amp unit (TAU)
―  Front door speaker (RH)
―  Tweeter (RH) (with tweeter (RH))
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Front door speaker (RH) terminal C
―  Front door speaker (RH) terminal B
•  Is the voltage 0 V?
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 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 (with tweeter (RH))
•  Tuner and amp unit (TAU) terminal 2O―Tweeter (RH) terminal A (with tweeter (RH))
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 27.
14
INSPECT FRONT DOOR SPEAKER (RH)
•  Inspect the front door speaker (RH).
(Refer to the [FRONT DOOR SPEAKER INSPECTION] in the workshop manual)]
•  Is the front door speaker (RH) normal?
Yes
Without tweeter (RH):
•  Go to Step 27.
With tweeter (RH):
•  Go to the next step.
No
Replace the front door speaker (RH), then go to Step 27.
(Refer to the [FRONT DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual)
15
INSPECT TWEETER (RH)
•  Inspect the tweeter (RH).
(Refer to the [TWEETER INSPECTION] in the workshop manual)
•  Is the tweeter (RH) normal?
Yes
Go to Step 27.
No
Replace the tweeter (RH), then go to Step 27.
(Refer to the [TWEETER REMOVAL/INSTALLATION] in the workshop manual)
16
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  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 27.
17
INSPECT REAR DOOR SPEAKER (LH) CONNECTOR CONDITION
•  Disconnect the rear door speaker (LH) 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 27.
18
INSPECT REAR DOOR SPEAKER (LH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the tuner and amp unit (TAU) and rear door speaker (LH) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Rear door speaker (LH) terminal C
―  Rear door speaker (LH) terminal B
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals:
•  Tuner and amp unit (TAU) terminal 2L―Rear door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2J―Rear door speaker (LH) terminal B
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 27.
No
Go to the next step.
19
INSPECT REAR DOOR SPEAKER (LH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the tuner and amp unit (TAU) and rear door speaker (LH) connectors are disconnected.
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Rear door speaker (LH) terminal C
―  Rear door speaker (LH) terminal B
•  Is the voltage 0 V?
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 2L―Rear door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2J―Rear door speaker (LH) terminal B
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 27.
20
INSPECT REAR DOOR SPEAKER (LH)
•  Inspect the rear door speaker (LH).
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual)
•  Is the rear door speaker (LH) normal?
Yes
Go to Step 27.
No
Replace the rear door speaker (LH), then go to Step 27.
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual)
21
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  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 27.
22
INSPECT REAR DOOR SPEAKER (RH) CONNECTOR CONDITION
•  Disconnect the rear door speaker (RH) 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 27.
23
INSPECT REAR DOOR SPEAKER (RH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the tuner and amp unit (TAU) and rear door speaker (RH) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Rear door speaker (RH) terminal C
―  Rear door speaker (RH) terminal B
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals:
•  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:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 27.
No
Go to the next step.
24
INSPECT REAR DOOR SPEAKER (RH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the tuner and amp unit (TAU) and rear door speaker (RH) connectors are disconnected.
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Rear door speaker (RH) terminal C
―  Rear door speaker (RH) terminal B
•  Is the voltage 0 V?
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 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:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 27.
25
INSPECT REAR DOOR SPEAKER (RH)
•  Inspect the rear door speaker (RH).
(Refer to the [REAR DOOR SPEAKER INSPECTION] in the workshop manual)
•  Is the rear door speaker (RH) normal?
Yes
Go to Step 27.
No
Replace the rear door speaker (RH), then go to Step 27.
(Refer to the [REAR DOOR SPEAKER REMOVAL/INSTALLATION] in the workshop manual)
26
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  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 the next step.
27
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Clear the DTC for the connectivity master unit (CMU) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 7 s or more.
•  Retrieve the connectivity master unit (CMU) DTCs using the M-MDS.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION] in the workshop manual)
Go to the next step.
No
Go to the next step.
28
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT (TYPE-A) (E)].)
No
DTC troubleshooting completed.


With Bose®

Description

Audio amplifier circuit malfunction
Detection condition
•  The connectivity master unit (CMU) detected a short to ground or short to power supply in the audio amplifier circuit with the ignition switched ON (engine off or on).
Fail-safe
Not applicable
Possible cause
•  Audio amplifier connector or terminal malfunction
•  Tuner and amp unit (TAU) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
L.H.D.
―  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1O
―  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1P
―  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1M
―  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1N
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF))
―  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1K
―  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
―  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1L
―  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1I
―  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1J
R.H.D.
―  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1M
―  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1N
―  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1O
―  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1P
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF) or CX-8 (KG))
―  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1I
―  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
―  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1J
―  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1K
―  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1L
•  Short to power supply in wiring harness between the following terminals:
L.H.D.
―  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1O
―  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1P
―  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1M
―  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1N
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF))
―  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1K
―  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
―  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1L
―  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1I
―  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1J
R.H.D.
―  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1M
―  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1N
―  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1O
―  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1P
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
―  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF) or CX-8 (KG))
―  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1I
―  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
―  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1J
―  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1K
―  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1L
•  Audio amplifier malfunction
•  Tuner and amp unit (TAU) malfunction

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

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  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 6.
2
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  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 6.
3
INSPECT AUDIO AMPLIFIER CIRCUIT FOR SHORT TO GROUND
•  Verify that the audio amplifier and tuner and amp unit (TAU) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
L.H.D.
―  Audio amplifier terminal 1O
―  Audio amplifier terminal 1P
―  Audio amplifier terminal 1M
―  Audio amplifier terminal 1N
―  Audio amplifier terminal 2D (CX-9 (TC))
―  Audio amplifier terminal 2F (CX-5 (KF))
―  Audio amplifier terminal 1K
―  Audio amplifier terminal 2H
―  Audio amplifier terminal 1L
―  Audio amplifier terminal 1I
―  Audio amplifier terminal 1J
R.H.D.
―  Audio amplifier terminal 1M
―  Audio amplifier terminal 1N
―  Audio amplifier terminal 1O
―  Audio amplifier terminal 1P
―  Audio amplifier terminal 2D (CX-9 (TC))
―  Audio amplifier terminal 2F (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 1I
―  Audio amplifier terminal 2H
―  Audio amplifier terminal 1J
―  Audio amplifier terminal 1K
―  Audio amplifier terminal 1L
•  Is there continuity?
Yes
Refer to the wiring diagram and verify if there is a common connector between the following terminals:
L.H.D.
•  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1O
•  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1P
•  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1M
•  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1N
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF))
•  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1K
•  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
•  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1L
•  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1I
•  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1J
R.H.D.
•  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1M
•  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1N
•  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1O
•  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1P
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF) or CX-8 (KG))
•  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1I
•  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
•  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1J
•  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1K
•  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1L
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 Step 6.
No
Go to the next step.
4
INSPECT AUDIO AMPLIFIER CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the audio amplifier and tuner and amp unit (TAU) connectors are disconnected.
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
L.H.D.
―  Audio amplifier terminal 1O
―  Audio amplifier terminal 1P
―  Audio amplifier terminal 1M
―  Audio amplifier terminal 1N
―  Audio amplifier terminal 2D (CX-9 (TC))
―  Audio amplifier terminal 2F (CX-5 (KF))
―  Audio amplifier terminal 1K
―  Audio amplifier terminal 2H
―  Audio amplifier terminal 1L
―  Audio amplifier terminal 1I
―  Audio amplifier terminal 1J
R.H.D.
―  Audio amplifier terminal 1M
―  Audio amplifier terminal 1N
―  Audio amplifier terminal 1O
―  Audio amplifier terminal 1P
―  Audio amplifier terminal 2D (CX-9 (TC))
―  Audio amplifier terminal 2F (CX-5 (KF) or CX-8 (KG))
―  Audio amplifier terminal 1I
―  Audio amplifier terminal 2H
―  Audio amplifier terminal 1J
―  Audio amplifier terminal 1K
―  Audio amplifier terminal 1L
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals:
L.H.D.
•  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1O
•  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1P
•  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1M
•  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1N
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF))
•  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1K
•  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
•  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1L
•  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1I
•  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1J
R.H.D.
•  Tuner and amp unit (TAU) terminal 2P—Audio amplifier terminal 1M
•  Tuner and amp unit (TAU) terminal 2N—Audio amplifier terminal 1N
•  Tuner and amp unit (TAU) terminal 2Q—Audio amplifier terminal 1O
•  Tuner and amp unit (TAU) terminal 2O—Audio amplifier terminal 1P
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2D (CX-9 (TC))
•  Tuner and amp unit (TAU) terminal 1U—Audio amplifier terminal 2F (CX-5 (KF) or CX-8 (KG))
•  Tuner and amp unit (TAU) terminal 2L—Audio amplifier terminal 1I
•  Tuner and amp unit (TAU) terminal 1Y—Audio amplifier terminal 2H
•  Tuner and amp unit (TAU) terminal 2J—Audio amplifier terminal 1J
•  Tuner and amp unit (TAU) terminal 2M—Audio amplifier terminal 1K
•  Tuner and amp unit (TAU) terminal 2K—Audio amplifier terminal 1L
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 power supply 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 the power supply.
Go to Step 6.
5
VERIFY IF MALFUNCTIONING LOCATION IS AUDIO AMPLIFIER DEPENDING ON REPEATABILITY
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Clear the DTC for the connectivity master unit (CMU) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 7 s or more.
•  Retrieve the connectivity master unit (CMU) DTCs using the M-MDS.
•  Is the same Pending DTC present?
Yes
Replace the audio amplifier, then go to the next step.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual)
No
Go to Step 7.
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
(Refer to the [NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION] in the workshop manual)
•  Clear the DTC for the connectivity master unit (CMU) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 7 s or more.
•  Retrieve the connectivity master unit (CMU) DTCs using the M-MDS.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the tuner and amp unit (TAU).
(Refer to the [TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION] in the workshop manual)
Go to the next step.
No
Go to the next step.
7
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT (TYPE-A) (E)].)
No
DTC troubleshooting completed.