Audio System Symptom Troubleshooting - Audio remote switch does not work properly (audio-navigation unit buttons work)
Audio remote switch does not work properly (audio-navigation unit buttons work)
NOTE:
Check the vehicle 12 volt battery condition first.
Check the connectors for poor connections or loose terminals.
1.
Determine possible failure area (audio system, others):

Determine possible failure area (audio system, others)
?1.
Turn the vehicle to the ON mode.

?2.
Check if any MID information appears on the multi-information display unit.

Is there any information displayed?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
Problem verification:

Problem verification
?1.
Turn on the audio system, and using the audio remote switch buttons, check if the multi-information display unit operates properly.

Is the display operation OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time.?
     
NO
     
     
     
The failure is duplicated, go to step 3.
3.
Determine possible failure area (B-CAN lines, others):

Determine possible failure area (B-CAN lines, others)
?1.
Go into the System Diagnostic Mode, and use the In Line Diag in the Display Diagnosis.
NOTE: When specific button(s) does not work normally, try with the specific button(s).

Does the Display Diagnosis start, and is the audio remote switch connection OK?

     
YES
     
     
     
Go to step 10.
     
NO
     
     
     
Go to step 4.
4.
Determine possible failure area (audio remote/multi-information display switch, others):

Determine possible failure area (audio remote/multi-information display switch, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Do the Audio Remote/Multi-Information Display Switch Test.

Is the audio remote/multi-information display switch OK?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
5.
Shorted wire check (AUDIO REMOTE SW line):

Shorted wire check (AUDIO REMOTE SW line)
?1.
Disconnect the following connector.
Multi-information display unit connector A (32P)

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio remote/multi-information display switch 12P connector: disconnected
 
Multi-information display unit connector A (32P): disconnected
Test point 1
Multi-information display unit connector A (32P) No. 6
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire between the multi-information display unit and the audio remote switch. If the wires are OK, replace the cable reel.?
     
NO
     
     
     
The AUDIO REMOTE SW wire is not shorted to ground. Go to step 6.
6.
Shorted wire check (TFT INFO line):

Shorted wire check (TFT INFO line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio remote/multi-information display switch 12P connector: disconnected
 
Multi-information display unit connector A (32P): disconnected
Test point 1
Multi-information display unit connector A (32P) No. 7
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire between the multi-information display unit and the audio remote switch. If the wires are OK, replace the cable reel.?
     
NO
     
     
     
The TFT INFO wire is not shorted to ground. Go to step 7.
7.
Determine possible failure area (TFT INFO line, others):

Determine possible failure area (TFT INFO line, others)
?1.
Reconnect the audio remote/multi-information display switch 12P connector.

?2.
Measure the resistance between test points 1 and 2 as specified in the table.
Test condition
Vehicle OFF (LOCK) mode
 
Multi-information display unit connector A (32P): disconnected
Test point 1
Multi-information display unit connector A (32P) No. 6
Test point 2
Multi-information display unit connector A (32P) No. 23

AUDIO REMOTE/MULTI-INFORMATION DISPLAY SWITCH TABLE
Button held down
VOL DOWN
VOL UP
LEFT
RIGHT
SOURCE
No button pressed
Resistance
About 99 ?
About 357 ?
About 775 ?
About 1.7 k?
About 3.7 k?
About 10 k?

Is the resistance OK?

     
YES
     
     
     
Go to step 8.
     
NO
     
     
     
Go to step 9.
8.
Open wire check (TFT INFO line):

Open wire check (TFT INFO line)
?1.
Measure the resistance between test points 1 and 2 as specified in the table.
Test condition
Vehicle OFF (LOCK) mode
 
Multi-information display unit connector A (32P): disconnected
Test point 1
Multi-information display unit connector A (32P) No. 7
Test point 2
Multi-information display unit connector A (32P) No. 23

AUDIO REMOTE/MULTI-INFORMATION DISPLAY SWITCH TABLE
Button held down
MENU
DISPLAY
No button pressed
Resistance
About 33 ?
About 363 ?
No continuity

Is the resistance OK?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire between the multi-information display unit and the audio remote switch. If the wires are OK, replace the cable reel.?
9.
Determine possible failure area (AUDIO REMOTE SW line, REMOTE SW GND line):

Determine possible failure area (AUDIO REMOTE SW line, REMOTE SW GND line)
?1.
Measure the resistance between test points 1 and 2 as specified in the table.
Test condition
Vehicle OFF (LOCK) mode
 
Multi-information display unit connector A (32P): disconnected
Test point 1
Multi-information display unit connector A (32P) No. 7
Test point 2
Multi-information display unit connector A (32P) No. 23

AUDIO REMOTE/MULTI-INFORMATION DISPLAY SWITCH TABLE
Button held down
MENU
DISPLAY
No button pressed
Resistance
About 33 ?
About 363 ?
No continuity

Is the resistance OK?

     
YES
     
     
     
Repair an open in the wire between the multi-information display unit and the audio remote switch. If the wires are OK, replace the cable reel.?
     
NO
     
     
     
Repair an open in the wire between the multi-information display unit and the audio remote switch. If the wires are OK, replace the cable reel.?
10.
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.
Audio-navigation unit connector C (20P)
Multi-information display unit connector A (32P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector C (20P): disconnected
 
Multi-information display unit connector A (32P): disconnected
Test point 1
Audio-navigation unit connector C (20P) No. 13
Test point 2
Multi-information display unit connector A (32P) No. 31


Is there continuity?

     
YES
     
     
     
The B-CAN_H and the B-CAN_L wires are OK. Go to step 11.
     
NO
     
     
     
Repair an open in the wire(s) between the audio-navigation unit and the multi-information display unit.?
11.
Multi-information display unit check (substitution):

Multi-information display unit check (substitution)
?1.
Substitute a known-good multi-information display unit.

?2.
Reconnect all the connectors, and recheck.

Does the symptom go away?

     
YES
     
     
     
     
NO