DTC B1238:01 [CONNECTIVITY MASTER UNIT]

id0902n7104800


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
•  Door speaker (LH) connector or terminal malfunction
•  Tweeter (LH) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2P—Door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
•  Short to power supply in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2P—Door speaker (LH) terminal C
―  Tuner and amp unit (TAU) terminal 2N—Door speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
•  Door speaker (LH) malfunction
•  Tweeter (LH) malfunction
•  Door speaker (RH) connector or terminal malfunction
•  Tweeter (RH) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2Q—Door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—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
•  Short to power supply in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2Q—Door speaker (RH) terminal C
―  Tuner and amp unit (TAU) terminal 2O—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
•  Door speaker (RH) malfunction
•  Tweeter (RH) malfunction
•  Driver-side headrest speaker (LH) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2L(R.H.D.)/ 2M (L.H.D.)—Driver-side headrest speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2J(R.H.D.)/ 2K (L.H.D.)—Driver-side headrest speaker (LH) terminal A
•  Short to power supply in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2L(R.H.D.)/ 2M (L.H.D.)—Driver-side headrest speaker (LH) terminal B
―  Tuner and amp unit (TAU) terminal 2J(R.H.D.)/ 2K (L.H.D.)—Driver-side headrest speaker (LH) terminal A
•  Driver-side headrest speaker (LH) malfunction
•  Driver-side headrest speaker (RH) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2M(R.H.D.)/ 2L (L.H.D.)—Driver-side headrest speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2K(R.H.D.)/ 2J (L.H.D.)—Driver-side headrest speaker (RH) terminal A
•  Short to power supply in wiring harness between the following terminals:
―  Tuner and amp unit (TAU) terminal 2M(R.H.D.)/ 2L (L.H.D.)—Driver-side headrest speaker (RH) terminal B
―  Tuner and amp unit (TAU) terminal 2K(R.H.D.)/ 2J (L.H.D.)—Driver-side headrest speaker (RH) terminal A
•  Driver-side headrest 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 door speaker (LH) and tweeter (LH)
•  Go to the next step.
No audio produced from door speaker (RH) and tweeter (RH)
•  Go to Step 9.
No sound produced from driver-side headrest speaker (LH)
•  Go to Step 16.
No audio produced from driver-side headrest 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.
•  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 DOOR SPEAKER (LH) CONNECTOR CONDITION
•  Disconnect the 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.
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 DOOR SPEAKER (LH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the following connectors are disconnected:
―  Tuner and amp unit (TAU)
―  Door speaker (LH)
―  Tweeter (LH)
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Door speaker (LH) terminal C
―  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 2P—Door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2N—Door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
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 part.
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 DOOR SPEAKER (LH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the following connectors are disconnected:
―  Tuner and amp unit (TAU)
―  Door speaker (LH)
―  Tweeter (LH)
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Door speaker (LH) terminal C
―  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 2P—Door speaker (LH) terminal C
•  Tuner and amp unit (TAU) terminal 2N—Door speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2P—Tweeter (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2N—Tweeter (LH) terminal A
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 part.
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 DOOR SPEAKER (LH)
•  Inspect the door speaker (LH).
•  Is the door speaker (LH) normal?
Yes
Go to the next step.
No
Replace the door speaker (LH), then go to Step 27.
(See DOOR SPEAKER REMOVAL/INSTALLATION.)
8
INSPECT TWEETER (LH)
•  Inspect the tweeter (LH)
•  Is the tweeter (LH) normal?
Yes
Go to Step 27.
No
Replace the tweeter (LH), then go to Step 27.
(See TWEETER REMOVAL/INSTALLATION.)
9
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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 DOOR SPEAKER (RH) CONNECTOR CONDITION
•  Disconnect the 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.
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 DOOR SPEAKER (RH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the following connectors are disconnected:
―  Tuner and amp unit (TAU)
―  Door speaker (RH)
―  Tweeter (RH)
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Door speaker (RH) terminal C
―  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—Door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2O—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
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 part.
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 DOOR SPEAKER (RH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the following connectors are disconnected:
―  Tuner and amp unit (TAU)
―  Door speaker (RH)
―  Tweeter (RH)
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Door speaker (RH) terminal C
―  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—Door speaker (RH) terminal C
•  Tuner and amp unit (TAU) terminal 2O—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
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 part.
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 DOOR SPEAKER (RH)
•  Inspect the door speaker (RH).
•  Is the door speaker (RH) normal?
Yes
Go to the next step.
No
Replace the door speaker (RH), then go to Step 27.
(See DOOR SPEAKER REMOVAL/INSTALLATION.)
15
INSPECT TWEETER (RH)
•  Inspect the tweeter (RH).
•  Is the tweeter (RH) normal?
Yes
Go to Step 27.
No
Replace the tweeter (RH), then go to Step 27.
(See TWEETER REMOVAL/INSTALLATION.)
16
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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 DRIVER-SIDE HEADREST SPEAKER (LH) CONNECTOR CONDITION
•  Disconnect the driver-side headrest 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 DRIVER-SIDE HEADREST SPEAKER (LH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the tuner and amp unit (TAU) and driver-side headrest speaker (LH) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Driver-side headrest speaker (LH) terminal B
―  Driver-side headrest speaker (LH) terminal A
•  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(R.H.D.)/ 2M (L.H.D.)—Driver-side headrest speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2J(R.H.D.)/ 2K (L.H.D.)—Driver-side headrest speaker (LH) terminal A
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 part.
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 DRIVER-SIDE HEADREST SPEAKER (LH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the tuner and amp unit (TAU) and driver-side headrest speaker (LH) connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Driver-side headrest speaker (LH) terminal B
―  Driver-side headrest speaker (LH) terminal A
•  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(R.H.D.)/ 2M (L.H.D.)—Driver-side headrest speaker (LH) terminal B
•  Tuner and amp unit (TAU) terminal 2J(R.H.D.)/ 2K (L.H.D.)—Driver-side headrest speaker (LH) terminal A
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 part.
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 DRIVER-SIDE HEADREST SPEAKER (LH)
•  Inspect the driver-side headrest speaker (LH).
•  Is the driver-side headrest speaker (LH) normal?
Yes
Go to Step 27.
No
Replace the driver-side headrest speaker (LH), then go to Step 27.
(See HEADREST SPEAKER REMOVAL/INSTALLATION.)
21
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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 DRIVER-SIDE HEADREST SPEAKER (RH) CONNECTOR CONDITION
•  Disconnect the driver-side headrest 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 DRIVER-SIDE HEADREST SPEAKER (RH) CIRCUIT FOR SHORT TO GROUND
•  Verify that the tuner and amp unit (TAU) and driver-side headrest speaker (RH) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Driver-side headrest speaker (RH) terminal B
―  Driver-side headrest speaker (RH) terminal A
•  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(R.H.D.)/ 2L (L.H.D.)—Driver-side headrest speaker (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2K(R.H.D.)/ 2J (L.H.D.)—Driver-side headrest speaker (RH) terminal A
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 part.
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 DRIVER-SIDE HEADREST SPEAKER (RH) CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the tuner and amp unit (TAU) and driver-side headrest speaker (RH) connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Driver-side headrest speaker (RH) terminal B
―  Driver-side headrest speaker (RH) terminal A
•  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(R.H.D.)/ 2L (L.H.D.)—Driver-side headrest speaker (RH) terminal B
•  Tuner and amp unit (TAU) terminal 2K(R.H.D.)/ 2J (L.H.D.)—Driver-side headrest speaker (RH) terminal A
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 part.
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 DRIVER-SIDE HEADREST SPEAKER (RH)
•  Inspect the driver-side headrest speaker (RH).
•  Is the driver-side headrest speaker (RH) normal?
Yes
Go to Step 27.
No
Replace the driver-side headrest speaker (RH), then go to Step 27.
(See HEADREST SPEAKER REMOVAL/INSTALLATION.)
26
INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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.
•  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).
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].)
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
―  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
―  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
―  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
―  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  :L.H.D.
*2  :R.H.D.

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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:
―  Tuner and amp unit (TAU) terminal 2P
―  Tuner and amp unit (TAU) terminal 2N
―  Tuner and amp unit (TAU) terminal 2Q
―  Tuner and amp unit (TAU) terminal 2O
―  Tuner and amp unit (TAU) terminal 1U
―  Tuner and amp unit (TAU) terminal 2L
―  Tuner and amp unit (TAU) terminal 1Y
―  Tuner and amp unit (TAU) terminal 2J
―  Tuner and amp unit (TAU) terminal 2M
―  Tuner and amp unit (TAU) terminal 2K
•  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
•  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
•  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:
•  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 part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short 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.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Tuner and amp unit (TAU) terminal 2P
―  Tuner and amp unit (TAU) terminal 2N
―  Tuner and amp unit (TAU) terminal 2Q
―  Tuner and amp unit (TAU) terminal 2O
―  Tuner and amp unit (TAU) terminal 1U
―  Tuner and amp unit (TAU) terminal 2L
―  Tuner and amp unit (TAU) terminal 1Y
―  Tuner and amp unit (TAU) terminal 2J
―  Tuner and amp unit (TAU) terminal 2M
―  Tuner and amp unit (TAU) terminal 2K
•  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
•  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
•  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:
•  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 part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to 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.
•  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.
(See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
No
Go to Step 7.
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  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).
Go to the next step.
No
Go to the next step.
7
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].)
No
DTC troubleshooting completed.