Audio System Symptom Troubleshooting - Audio unit button illumination does not work
Audio unit button illumination does not work
NOTE:
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 (enu_255699_1.0) position.

?3.
Check the illumination of the audio unit buttons.

Are the buttons illuminated?

     
YES
     
     
     
Intermittent failure, the audio 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 system.

Are the buttons illuminated?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Troubleshoot the interior lights.?
3.
Open wire check (ILLUMI+ line):

Open wire check (ILLUMI+ line)
?1.
Turn the combination light switch off.

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

?3.
Disconnect the following connector.
NOTE: Eject the disc before disconnecting the audio unit to prevent damaging the CD player's load mechanism.

Audio unit connector A (24P)

?4.
Turn the combination lighting switch to the parking light position.

?5.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Audio unit connector A (24P): disconnected
Test point 1
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire between the audio unit and the combination light switch.?