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

id0903e2803600

7 | ALC function is inoperative
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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.

Diagnostic procedure

STEP | INSPECTION | ACTION
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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.)