Audio System Symptom Troubleshooting - Audio remote switch does not work properly (audio unit buttons work) (With Display Audio (7-inch Screen))

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 12 volt battery condition first.
	If any button of the audio remote switch does not work, do the Hard Key in the System Diagnostic Mode.
	Check the connectors for poor connections or loose terminals.

Problem verification:

Problem verification

?1.	Turn the vehicle to the ON mode.

?2.	Turn on the audio system, and check the audio remote switch operation.

Is the audio system operation OK?


	YES

Intermittent failure, the system is OK at this time.?


	NO

The failure is duplicated, go to step 2.

Audio remote switch check:

Audio remote switch check

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

?2.

Disconnect the following connector.

Audio remote switch 12P connector

?3.	Do the Audio Remote Switch Test.

Is the audio remote switch OK?


	YES

Go to step 3.


	NO

Replace the audio remote switch.?

Shorted wire check (AUDIO REMOTE SW line, DISPLAY SW line):

Shorted wire check (AUDIO REMOTE SW line, DISPLAY SW line)

?1.

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)

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


	NO

The AUDIO REMOTE SW and the DISPLAY SW wires are not shorted to ground. Go to step 4.

Determine possible failure area (DISPLAY SW line, others):

Determine possible failure area (DISPLAY SW line, others)

?1.	Reconnect the audio remote switch 12P connector.

?2.

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. 11
Test point 2	Audio unit connector A (24P) No. 22

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 5.


	NO

Go to step 6.

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.

Test condition	Vehicle OFF (LOCK) mode
	Audio unit connector A (24P): disconnected
Test point 1	Audio unit connector A (24P) No. 11
Test point 2	Audio unit connector A (24P) No. 23

Button held down	MENU	DISP	No button pressed
Resistance	About 33 ?	About 363 ?	No continuity

Is the resistance OK?


	YES

Replace the audio unit.?


	NO

Repair an open or high resistance in the wire between the audio unit and the audio remote switch. If the wire is OK, replace the cable reel.?

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
	Audio unit connector A (24P): disconnected
Test point 1	Audio unit connector A (24P) No. 11
Test point 2	Audio unit connector A (24P) No. 23

Button held down	MENU	DISP	No button pressed
Resistance	About 33 ?	About 363 ?	No continuity

Is the resistance OK?


	YES

Repair an open or high resistance in the AUDIO REMOTE SW wire between the audio unit and the audio remote switch. If the wire is OK, replace the cable reel.?


	NO

Repair an open or high resistance in the REMOTE SW GND wire between the audio unit and the audio remote switch. If the wire is OK, replace the cable reel.?