Audio System Symptom Troubleshooting - Audio remote switch does not work properly (audio unit buttons work)
Audio remote switch does not work properly (audio unit buttons work)
NOTE:
Check the vehicle 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.
Turn on the audio unit, and using the audio remote switch buttons, check if the audio system operates properly.

Is the audio unit 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 switch, others):

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

?2.
Do the Audio Remote Switch Test.

Is the audio remote switch OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Shorted wire check (AUDIO REMOTE SW, DISPAY SW line):

Shorted wire check (AUDIO REMOTE SW, DISPAY SW line)
?1.
Disconnect the following connector.
NOTE: Eject the disc before disconnecting the audio unit to prevent damaging the CD player load mechanism.

Audio unit connector A (24P)

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio remote switch 12P connector: disconnected
 
Audio unit connector A (24P): : disconnected
 
Test point 1
Audio unit connector A (24P) No. 22
Test point 2
Body ground

Test point 1
Audio unit connector A (24P) No. 23
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire between the audio unit and the audio remote switch. If the wire is OK, replace the cable reel.?
     
NO
     
     
     
The AUDIO REMOTE SW and the DISPLAY SW wires are not shorted to ground. Go to step 4.
4.
Open wire check (AUDIO REMOTE SW line, REMOTE SW GND line):

Open wire check (AUDIO REMOTE SW line, REMOTE SW GND line)
?1.
Reconnect the audio remote switch 12P connector, and measure the resistance between test points 1 and 2 as specified in the table.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector A (24P): disconnected
Test point 1
Audio unit connector A (24P) No. 22
Test point 2
Audio unit connector A (24P) No. 11

AUDIO REMOTE SWITCH TABLE
Button held down
VOL DOWN
VOL UP
LEFT
(CH ?)
RIGHT
(CH ?)
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
     
     
     
The AUDIO REMOTE SW wire and the AUDIO REMOTE GND wire are not open. Go to step 5.
     
NO
     
     
     
Repair an open in the wire(s) between the audio unit and the audio remote switch. If the wires are OK, replace the cable reel.?
5.
Open wire check (DISPLAY SW line):

Open wire check (DISPLAY SW line)
?1.
Measure the resistance between test points 1 and 2 as specified in the table.
vehicle OFF (LOCK) mode
Audio unit connector A (24P): disconnected
Audio unit connector A (24P) No. 23
Audio unit connector A (24P) No. 11

AUDIO REMOTE 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(s) between the audio unit and the audio remote switch. If the wires are OK, replace the cable reel.?