Possible DTC

ALC function is inoperative

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.

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

• 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.

No

Replace the audio unit.

(See AUDIO UNIT REMOVAL/INSTALLATION.)