Navigation Unit Button Illumination Does Not Work (With 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-navigation unit buttons.
Are the buttons illuminated?
YES - Intermittent problem: the audio-navigation unit is OK at this time. Check for loose or poor connections at the audio-navigation unit connector A (24P).
NO - Go to step 4.
- Check the illumination of several other buttons not related to the navigation 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-navigation unit.
- Turn the ignition switch to LOCK (0).
- Disconnect audio-navigation unit connector A (24P).NOTE: Eject all the discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Disconnect gauge control module 36P connector.
- Check for continuity between audio-navigation unit connector A (24P) terminal No. 1 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-navigation unit.
- Turn the ignition switch to ON (II).
- With the headlight switch still on, measure the voltage between audio-navigation unit connector A (24P) terminal No. 13 and body ground.
Is there battery voltage?
YES - Check the connections at audio-navigation unit connector A (24P). If all connections are OK, replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
NO - Repair an open in the wire between the under-dash fuse/relay box and the audio-navigation unit.