Audio System Symptom Troubleshooting - Audio remote-HFL switch does not work properly (audio unit buttons work) (Without Multi-Information Display)

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.
	If any button of the audio remote-HFL switch does not work, do the Knob Check 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.	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.

Audio remote switch check:

Audio remote switch check

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

?2.

Disconnect the following connector.

Audio remote-HFL switch 12P connector

?3.	Do the Audio Remote-HFL Switch Test.

Is the audio remote-HFL switch OK?


	YES

Go to step 3.


	NO

Replace the audio remote-HFL switch.?

Shorted wire check (AUDIO REMOTE SW line, HFT/NAVI REMOTE SW line):

Shorted wire check (AUDIO REMOTE SW line, HFT/NAVI REMOTE SW line)

?1.

Disconnect the following connector.

Audio unit connector A (24P)

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio remote-HFL switch 12P connector: disconnected
	Audio unit connector A (24P): disconnected
Test point 1	Audio unit connector A (24P) No. 9
Test point 2	Body ground

Test point 1	Audio unit connector A (24P) No. 20
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-HFL switch. If the wires are OK, replace the cable reel.?


	NO

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

Determine possible failure area (HFT/NAVI REMOTE SW line, others):

Determine possible failure area (HFT/NAVI REMOTE SW line, others)

?1.	Reconnect the audio remote-HFL 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. 9
Test point 2	Audio unit connector A (24P) No. 19

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 (HFT/NAVI REMOTE SW line):

Open wire check (HFT/NAVI REMOTE 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. 19
Test point 2	Audio unit connector A (24P) No. 20

Button held down	HANG-UP/BACK	PICK-UP	TALK	No button pressed
Resistance	About 47 ?	About 222 ?	About 2.25 k?	About 10 k?

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-HFL 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. 19
Test point 2	Audio unit connector A (24P) No. 20

Button held down	HANG-UP/BACK	PICK-UP	TALK	No button pressed
Resistance	About 47 ?	About 222 ?	About 2.25 k?	About 10 k?

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-HFL 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-HFL switch. If the wire is OK, replace the cable reel.?