Audio Unit Button Illumination Does Not Work (Without Navigation)

Audio System Symptom Troubleshooting - Audio unit button illumination does not work (without navigation)

Audio unit button illumination does not work (without navigation)

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.

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

2. Turn the combination light 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. Check for loose or poor connections at the audio unit connector A (17P).�

NO -

Go to step 4.

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

Are the buttons illuminated?

YES -

Go to step 5.

NO -

Troubleshoot the dashboard illumination circuit. Check 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 (17P).

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

7. Disconnect the gauge control module 36P connector.

8. Check for continuity between audio unit connector A (17P) terminal No. 1 and gauge control module 36P connector terminal No. 1.





Is there continuity?

YES -

Go to step 9.

NO -

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

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

10. With the combination light switch in the parking light position still on, measure the voltage between audio unit connector A (17P) terminal No. 10 and body ground.





Is there battery voltage?

YES -

Check the connections at audio unit connector A (17P). If all the connections are OK, replace the audio unit Audio Unit Removal/Installation.�

NO -

Check the No. 14 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair an open in the wire between the under-dash fuse/relay box and the audio unit.�