Navigation System Symptom Troubleshooting - Audio-navigation unit illumination does not work
Audio-navigation unit illumination does not work
NOTE:
Check the vehicle 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 lighting switch to the parking light position (enu_255699_1.0).

?3.
Check if the audio-navigation unit are illuminated.

Are the audio-navigation unit 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 if several other buttons that are not related to the audio system are illuminated.

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 Vehicle Status to check the ILL (Illumination).

Does the ILL signal change from [0] to [1] when the combination light switch is turned to the parking light position (enu_255699_1.0)?

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

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

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

?3.
Disconnect the following connectors.
Audio-navigation unit connector B (20P)
Gauge control module 32P connector

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector B (20P): disconnected
 
Gauge control module 32P connector: disconnected
Test circuit 1
  
Test point 1
Audio-navigation unit connector B (20P) No. 3
Test point 2
Gauge control module 32P connector No. 31


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire(s) between the audio-navigation unit and the gauge control module.?