Navigation System Symptom Troubleshooting - Audio-navigation unit button illumination does not work
Audio-navigation unit button illumination does not work
NOTE:
Check the vehicle 12 volt battery condition first.
Check for B-CAN DTCs and resolve them before troubleshooting.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Turn the combination light switch to the parking light (enu_255699_1.0) 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
     
     
     
The failure is duplicated, go to step 2.
2.
Determine possible failure area (interior lights circuit, others):

Determine possible failure area (interior lights circuit, others)
?1.
Check the illumination of several other buttons not related to the audio/navigation system.

Are the buttons illuminated?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Troubleshoot the interior lights.?
3.
Determine possible failure area (audio-navigation unit, others):

Determine possible failure area (audio-navigation unit, others)
?1.
Go into the System Diagnostic Mode, and use the Car Status to check the ILL signal.

Does the ILL signal change from [0] to [1] when the combination light switch is turned to the parking light position?

     
YES
     
     
     
     
NO
     
     
     
Go to step 4.
4.
Open wire check (B-CAN_H line, B-CAN_L line):

Open wire check (B-CAN_H line, B-CAN_L line)
?1.
Turn the combination light switch off.

?2.
Turn the vehicle to the OFF (LOCK) mode.

?3.
Disconnect the following connectors.
Gauge control module 32P connector
Audio-navigation unit connector A (24P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Gauge control module 32P connector: disconnected
 
Audio-navigation unit connector A (24P): disconnected
Test point 1
Gauge control module 32P connector No. 23
Test point 2
Audio-navigation unit connector A (24P) No. 14


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire(s).?