Navigation Unit Button Illumination Does Not Work (With Navigation)

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

Navigation unit button illumination does not work (with navigation)

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.

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-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.

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.�

5. Turn the ignition switch to LOCK (0).

6. 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.

7. Disconnect the gauge control module 36P connector.

8. 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.�

9. Turn the ignition switch to ON (II).

10. 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 Audio-Navigation Unit Removal/Installation (With Navigation).�

NO -

Repair an open in the wire between the under-dash fuse/relay box and the audio-navigation unit.�