Audio-Navigation Unit Button illumination Does Not Work

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

Audio-Navigation unit button illumination does not work

NOTE:

- Check the vehicle battery condition first Battery Test.
- 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 failure, the audio-navigation unit is OK at this time.

NO -

Go to step 4.

4. Check the illumination of several other buttons not related to the audio system.

Are the buttons illuminated?

YES -

Check for B-CAN DTCs (communication BUS Line Error) with the HDS and go to the indicated DTC's troubleshooting.
If no B-CAN DTCs or communication bus line errors are found, substitute a known-good audio-navigation unit (including the HDD) Audio-Navigation Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio-navigation unit Audio-Navigation Unit Removal/Installation.

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.