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

id0903e2803600

7

ALC function is inoperative

Possible DTC

Using the M-MDS

U0155:00, U0010:88

Without using M-MDS (On-board diagnostic test mode)

16:Er12, 17:Er11

Possible cause

•  Open or short circuit in vehicle speed signal wiring harness (e. g., instrument cluster)

•  CAN signal wiring harness malfunction

•  Audio unit malfunction

Note

•  Inspect the ALC function while driving the vehicle with playing the CD.

7	ALC function is inoperative
Possible cause	• Open or short circuit in vehicle speed signal wiring harness (e. g., instrument cluster) • CAN signal wiring harness malfunction • Audio unit malfunction Note • Inspect the ALC function while driving the vehicle with playing the CD.

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.
1		No	Go to the next step.
2	• Retrieve the DTCs from all vehicle modules using the M-MDS. • Is there the following DTC displayed? ― Vehicle speed signal wiring harness ― CAN signal wiring harness	Yes	Go to the appropriate DTC inspection.
2		No	Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)

7	ALC function is inoperative
Possible DTC	Using the M-MDS	U0155:00, U0010:88
Possible DTC	Without using M-MDS (On-board diagnostic test mode)	16:Er12, 17:Er11
Possible cause	• Open or short circuit in vehicle speed signal wiring harness (e. g., instrument cluster) • CAN signal wiring harness malfunction • Audio unit malfunction Note • Inspect the ALC function while driving the vehicle with playing the CD.