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

NOTE:

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

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

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

3. Check the illumination of the audio unit buttons.

Are the buttons illuminated?

YES -

Intermittent failure, the audio unit is OK at this time.

NO -

Go to step 4.

4. Check the illumination of several other buttons not related to the audio system.

Are the buttons illuminated?

YES -

- Without USB adapter and climate control: Go to step 5.
- With USB adapter or without USB adapter, with climate control: Check for B-CAN DTCs (communication BUS Line Error) with the HDS and go to the indicated DTC's troubleshooting. If no B-CAN DTCs or communication bus line errors are found, substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal/Installation.

NO -

Troubleshoot the interior lights. Start by checking the No. 14 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the under-dash fuse/relay box and the audio unit.

5. Turn the ignition switch to LOCK (0).

6. Disconnect audio unit connector A (24P).

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

7. Turn the ignition switch to ON (II).

8. With the headlight switch on, measure the voltage between audio unit connector A (24P) terminal No. 13 and body ground.





Is there battery voltage?

YES -

Go to step 9.

NO -

Repair an open in the wire between the under-dash fuse/relay box and the audio unit.

9. Turn the ignition switch to LOCK (0).

10. Disconnect the gauge control module 32P connector.

11. Check for continuity between audio unit connector A (24P) terminal No. 1 and gauge control module 32P connector terminal No. 2.





Is there continuity?

YES -

Check the connections at the audio unit connector A (24P). If all connections are OK, replace the audio unit Audio Unit Removal/Installation.

NO -

Repair an open in the wire between the gauge control module and the audio unit.