Audio Unit Button Illumination Does Not Work

Audio System Symptom Troubleshooting - Audio unit button illumination does not work

Audio unit button illumination does not work

* Check the vehicle battery condition first Component Tests and General Diagnostics.
* Check for B-CAN DTCs and resolve them before troubleshooting.
* Check the connectors for poor connections or loose terminals.
* The climate control unit 32P (black) connector and the HFL control unit 32P (grey) connector are the same shape. Make sure the correct connector is connected to the applicable unit.

1. Problem verification:

-1. Turn the ignition switch to ON (II).

-2. Turn the combination lighting switch to the parking light position.

-3. Check if the audio unit buttons are illuminated.

Are the buttons illuminated?
-YES- Intermittent failure, the audio unit is OK at this time.
-NO- The failure is duplicated, go to step 2.

2. Determine possible failure area (interior lights circuit, others):

-1. Check if several other buttons that are not related to the audio system are illuminated.

Are the buttons illuminated?
-YES- Go to step 3.
-NO- Troubleshoot the interior lights.

3. Open wire check (B CAN-H line, B CAN-L line):

-1. Turn the combination lighting switch off.

-2. Turn the ignition switch to LOCK (0).

-3. Disconnect the following connectors.






-4. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Replace the audio unit Audio Unit Removal and Installation.
-NO- Repair an open in the wire(s) between the audio unit and the gauge control module.