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

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

Audio unit button illumination does not work

* 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. Open wire check (ILLUMI+ line):

Open wire check (ILLUMI+ line)
-1. Turn the combination light switch off.

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

-3. Disconnect the following connector.
NOTE: Eject all the discs before disconnecting the audio unit to prevent damaging the CD player's load mechanism.





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

-5. Turn the combination lighting switch to the parking light position.

-6. Measure the voltage between test points 1 and 2.









Is there battery voltage?
-YES- Go to step 4.
-NO- Repair a open in the wire between the No. B35 (7.5 A) fuse in the under-dash fuse/relay box and the audio unit.

4. Open wire check (ILLUMI-(BULB) line):

Open wire check (ILLUMI-(BULB) line)
-1. Turn the combination light switch off.

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

-3. Disconnect the following connector.





-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 between the audio unit and the gauge control module (tach).