Audio System Symptom Troubleshooting - Audio unit button illumination does not work(Without Navigation)

Audio 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:

  - 1. Turn the vehicle to the ON mode.

  - 2. Turn the combination light switch to the parking light position.

  - 3. Check if the audio unit buttons are illuminated.

  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):

  - 1. Check if several other buttons that are not related to the audio system are illuminated.

  Are the buttons illuminated?

  YES: With normal audio

  Go to step 3.

  YES: With display audio

  Go to step 4.

  NO 

  Troubleshoot the interior lights.

• 3. 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.

  Audio unit connector B (20P)

  Gauge control module connector A (32P)

  - 4. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Audio unit connector B (20P): disconnected
  	Gauge control module connector A (32P): disconnected
  Test point 1	Audio unit connector B (20P) No. 13 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Gauge control module connector A (32P) No. 30

  Test point 1	Audio unit connector B (20P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Gauge control module connector A (32P) No. 31

  Is there continuity?

  YES 

  Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

  NO 

  Repair an open in the wire(s) between the audio unit and the gauge control module.

• 4. 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.

  Audio unit connector C (20P)

  Gauge control module connector A (32P)

  - 4. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Audio unit connector C (20P): disconnected
  	Gauge control module connector A (32P): disconnected
  Test point 1	Audio unit connector C (20P) No. 13 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Gauge control module connector A (32P) No. 30

  Test point 1	Audio unit connector C (20P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Gauge control module connector A (32P) No. 31

  Is there continuity?

  YES 

  Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

  NO 

  Repair an open in the wire(s) between the audio unit and the gauge control module.