Audio Unit Button Illumination Does Not Work
Audio unit button illumination does not work1. Turn the ignition switch to ON (II).
2. Turn the headlight switch to the parking light position.
3. Check the illumination of the audio unit buttons.
Are the buttons illuminated?
YES - Intermittent problem: the audio unit is OK at this time. Check for loose or poor connections at audio unit 20P connector.
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. Start by checking the No. 23 (10 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 20P connector.
7. '00-03 models: Disconnect gauge assembly connector B (22P).
'04-07 models: Disconnect gauge assembly connector A (22P).
8. '00-03 models: Check for continuity between audio unit 20P connector No. 19 terminal and gauge assembly connector B (12P) No. 10 terminal.
'04-07 models: Check for continuity between audio unit connector A (20P) No. 19 terminal and gauge assembly connector A (22P) No. 19 terminal.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the gauge assembly and the audio unit.
9. Turn the ignition switch to ON (II).
10. With the headlight switch still on, check for voltage between audio unit 20P connector No. 9 terminal and body ground.
Is there battery voltage?
YES - Check the connections at the audio unit 20P connector. If all connections are OK, replace the audio unit.
NO - Repair open in the wire between the under-dash fuse/relay box and the audio unit.