Navigation Unit Button Illumination Does Not Work (With Navigation)

Navigation unit button illumination does not work (with navigation)

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 navigation unit buttons.

Are the buttons illuminated?

YES - Intermittent problem: The navigation unit is OK at this time. Check for loose or poor connections at the navigation unit connector A (17P)

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 dashboard illumination circuit. Check the No. 14 (7.5 A) fuse in the under-dash fuse/relay box.

5. Turn the ignition switch OFF.
6. Disconnect navigation unit connector A (17P).
7. Disconnect gauge control module connector A (36P).




8. Check for continuity between navigation unit connector A (17P) No. 1 terminal and gauge control module connector A (36P) No. 1 terminal.

Is there continuity?

YES - Go to step 9.

NO - Repair open in the wire between the gauge control module and the navigation unit.

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




10. With the headlight switch still on, measure the voltage between navigation unit connector A (17P) No. 10 terminal and body ground.

Is there battery voltage?

YES - Check the connections at navigation unit connector A (17P). If all connections are OK, replace the navigation unit.

NO - Check the No. 14 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse OK, repair open in the wire between the under-dash fuse/relay box and the navigation unit.