Audio System Symptom Troubleshooting - Audio remote-HFL switch does not work properly (audio unit buttons work)
Audio remote-HFL switch does not work properly (audio unit buttons work)
NOTE:
Check the vehicle 12 volt battery condition first.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

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

?2.
Using the audio remote-HFL switch buttons, check if the audio system and the HFL system operates properly.

Are the audio system and the HFL system operation OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time.?
     
NO
     
     
     
The failure is duplicated, go to step 2.
2.
Determine possible failure area (audio remote-HFL switch, others):

Determine possible failure area (audio remote-HFL switch, others)
?1.
Go into the System Diagnostic Mode, and use the Hard Key test under the Unit Check menu.

?2.
Check the audio remote-HFL switch status.

Do all of the buttons fail to respond?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Gauge control module DTCs check:

Gauge control module DTCs check
?1.
Check for gauge control module DTCs with the HDS.
DTC Description
DTC
B1195 Gauge control module lost communication with Audio Remote Switch(LIN bus connected)
  

Is DTC B1195 indicated?

     
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 vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Gauge control module connector A (32P)
Audio-navigation unit connector A (24P) (with navigation)
Audio unit connector A (24P) (without navigation)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Gauge control module connector A (32P): disconnected
 
Audio-navigation unit connector A (24P): disconnected
 
Audio unit connector A (24P): disconnected
Test point 1
Gauge control module connector A (32P) No. 30
Test point 2
Audio-navigation unit connector A (24P) No. 14
Audio unit connector A (24P) No. 14


Is there continuity?

     
YES: With navigation
     
     
     
     
YES: Without navigation
     
     
     
     
NO
     
     
     
Repair an open in the wire(s) between the audio-navigation unit or the audio unit and the gauge control module.?