| 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 problem: the audio unit is OK at this time. Check for loose or poor connections at the audio unit connector A (20P).n NO - Go to 4. |
| 4. | Check the illumination of several other buttons not related to the audio system. Are the buttons illuminated? YES - Go to 5. 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.n |
| 5. | Turn the ignition switch to LOCK (0). |
| 6. | Disconnect audio unit connector A (20P). |
| 7. | Disconnect gauge control module connector A (36P). |
| 8. | Check for continuity between audio unit connector A (20P) No. 1 terminal and gauge control module connector A (36P) No. 19 terminal.
Is there continuity? YES - Go to 9. NO - Repair the open in the wire between the gauge control module and the audio unit.n |
| 9. | Turn the ignition switch to ON (II). |
| 10. | With the headlight switch still on, check for voltage between audio unit connector A (20P) No. 9 terminal and body ground.
Is there battery voltage? YES - Check the connections at audio unit connector A (20P). If all the connections are OK, replace the audio unit.n NO - Repair open in the wire between the under-dash fuse/relay box and the audio unit.n |