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Audio System Symptom Troubleshooting - Audio unit button illumination does not work

Audio unit button illumination does no work
NOTE:
  • Check the vehicle battery condition first.
  • Check the connectors for poor connections or loose terminals.
  1. Check the No. 29 (10 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to Step 2 .
NO -
Replace the fuse, and recheck.■
  1. Turn the ignition switch to ON (II).
  1. Turn the combination lighting switch to the parking light position.
  1. 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 (24P).■
NO -
Go to Step 5 .
  1. Check the illumination of several other buttons not related to the audio system.
Are the buttons illuminated?
YES -
Go to Step 6 .
NO -
Troubleshoot the dashboard illumination circuit.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect audio unit connector A (24P).
    NOTE: Eject the CD before removing the audio unit to prevent damaging the CD player's load mechanism.
  1. Turn the ignition switch to ON (II).
  1. With the headlight switch still on, measure the voltage between audio unit connector A (24P) terminal No. 13 and body ground.
Is there battery voltage?
YES -
Check the connections at audio unit connector A (24P). 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.■