Audio Unit Button Illumination Does Not Work (With Multi-Information Display Without Navigation)

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

Audio unit button illumination does not work

NOTE:
* Check the vehicle battery condition first Battery Test.
* Check the connectors for poor connections or loose terminals.

1. Problem verification:

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):

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. Multiplex integrated control system DTC check:

Multiplex integrated control system DTC check
-1. Turn the combination light switch off.

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

-3. Connect the HDS to the DLC.

-4. Turn the ignition switch to ON (II).

-5. Clear the DTCs with the HDS.

-6. Turn the ignition switch to LOCK (0) and then back to ON (II).

-7. Check for DTCs with the HDS.

Are any DTCs indicated?
-YES- Go to indicated DTC's troubleshooting.
-NO- Go to step 4.

4. Open wire check (B_CAN-H line, B_CAN-L line):

Open wire check (B_CAN-H line, B_CAN-L line)
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.





-3. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Go to step 5.
-NO- Repair an open in the wire(s) between the audio unit and the gauge control module (tach).

5. Audio unit check:

Audio unit check
-1. Substitute a known-good audio switch panel Audio Unit Removal and Installation, and recheck.

Does the symptom go away?
-YES- Replace the original audio switch panel.
-NO- Replace the audio unit Audio Unit Removal and Installation.