Audio Unit Button Illumination Does Not Work
Audio unit button illumination does not workNOTE:
- Check the vehicle battery condition first.
- 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. Check for loose or poor connections at audio unit connector A (20P).
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 interior lights.
5. Turn the ignition switch to Lock (0).
6. Remove the audio-HVAC display module assembly, and disconnect audio unit connector A (20P).
NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD/DVD player's load mechanism.
7. Disconnect gauge control module connector B (18P).
8. Check for continuity between audio unit connector A (20P) terminal No. 19 and gauge control module connector B (18P) terminal No. 9.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the gauge control module and the audio unit.
9. Turn the ignition switch to ON (II).
10. With the headlight switch still on, measure the voltage between audio unit connector A (20P) terminal No. 9 and body ground.
Is there battery voltage?
YES - Check the connections at the audio unit connector A (20P). If all connections are OK, replace the audio unit.
NO - Repair open in the wire between the relay control module and the audio unit.