Audio Unit Button Illumination Does Not Work (Without Navigation)
- Check the vehicle battery condition first (see BATTERY TEST ).
- Check the connectors for poor connections or loose terminals.
- Turn the ignition switch to ON (II).
- Turn the combination lighting switch to the parking light position.
- 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 connector A (20P).
NO - Go to step 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. 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.
- Turn the ignition switch to LOCK (0).
- Disconnect audio unit connector A (20P).NOTE: Eject all the discs before removing the audio unit to prevent the CD player's load mechanism.
- Disconnect the gauge control module 36P connector.
- Check for continuity between audio unit connector A (20P) terminal No. 19 and gauge control module 36P connector terminal No. 26.
Is there continuity?
YES - Go to step 9.
NO - Repair an open in the wire between the gauge control module and the audio unit.
- Turn the ignition switch to ON (II).
- 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 audio unit connector A (20P). If all the connections are OK, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
NO - Repair an open in the wire between the under-dash fuse/relay box and the audio unit.