Audio Unit Button Illumination Does Not Work
Audio unit button illumination does not work1. Turn the ignition switch 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 the audio unit connector A (17P).
NO - Go to step 4.
4. Check the illumination of several other dash components that are not related to the audio system.
Dose the illumination for the other dash components work properly?
YES - Go to step 5.
NO - Troubleshoot the dash lights. Start by checking the No. 22 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, Go to gauge control module input test Component Tests and General Diagnostics, and test circuits A15 and A9.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the audio unit connector A (17P).
7. Disconnect the gauge control module connector A (20P).
8. Check for continuity between the audio unit connector A (17P) No. 1 terminal and gauge control module connector A (20P) No. 15 terminal.
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, check for voltage between the audio unit connector A (17P) No. 10 terminal and body ground.
Is there battery voltage?
YES - Check the connections at the audio unit connector A (17P). If all the connections are OK, replace the audio unit.
NO - Repair open in the wire between the under-dash fuse/relay box and the audio unit.