NO.7 ALC FUNCTION IS INOPERATIVE [ENTIRE AUDIO SYSTEM]


id0903e2803600

7

ALC function is inoperative

Possible DTC

With M-MDS

U0010:88, U0155:00

Without M-MDS

Audio unit
•  16:Er12
Car-navigation unit
•  Device code 16/Error code 12
•  Device code 17/Error code 11
POSSIBLECAUSE
•  Audio unit/car-navigation unit malfunction
•  CAN signal wiring harness malfunction (does not receive vehicle speed signal) (with audio system
•  Open or short circuit in vehicle speed signal wiring harness (e. g., instrument cluster) (with car-navigation system)
Note
•  Inspect the ALC function while driving the vehicle with playing the CD, etc.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
•  Turn the ALC function to ON.
•  Inspect the ALC function operation when driving the vehicle at ALC level 3.
•  Does the ALC system operate properly?
Yes
The system is normal. Explains the ALC function to the customer.
No
Go to the next step.
2
•  Verify that the speedometer indication.
•  Is there the following DTC displayed?
Yes
Go to the next step (with audio system).
Go to Step 4 (with car-navigation system).
No
Perform the instrument cluster symptom troubleshooting procedure.
3
•  Retrieve the DTCs from all vehicle modules using the M-MDS.
•  Is there the CAN related DTC displayed?
Yes
Go to the appropriate DTC inspection.
No
Replace the audio unit.
4
•  Inspect for open or short circuit in wiring between the car-navigation unit (24-pin) terminal 1I and instrument cluster terminal 2O.
•  Is the open or short circuit detected?
Yes
Repair or replace for open or short circuit.
No
Replace the car-navigation unit.