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.

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.

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;

	With navigation: Use the Hard Key test under the Unit Check menu.
	Display audio type without navigation: Use the Hard Key test under the Unit Check menu.
	Color audio type: Use the Knob Check test under the Version/System menu.

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

Do all of the buttons fail to respond?


	YES: With multi-information display

Go to step 3.


	YES: Without multi-information display

Go to step 5.


	NO

Replace the audio remote-HFL switch.?

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

Go to the indicated DTC's troubleshooting.?


	NO

Go to step 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) (with navigation): disconnected
	Audio unit connector A (24P) (without navigation): disconnected
Test point 1	Gauge control module connector A (32P) No. 30
Test point 2	Audio-navigation unit connector A (24P) No. 14
Test point 2	Audio unit connector A (24P) No. 14

Test point 1	Gauge control module connector A (32P) No. 31
Test point 2	Audio-navigation unit connector A (24P) No. 24
Test point 2	Audio unit connector A (24P) No. 24

Is there continuity?


	YES: With navigation

Replace the audio-navigation unit.?


	YES: Without navigation

Replace the audio unit.?


	NO

Repair an open in the wire(s).?

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 6.


	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).?


	NO

The AUDIO REMOTE SW and the HFT/NAVI REMOTE SW wires are not shorted to ground. Go to step 7.

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 8.


	NO

Go to step 9.

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	PICK-UP	No button pressed
Resistance	About 47 ?	About 222 ?	About 10 k?

Is the resistance OK?


	YES

Replace the audio unit.?


	NO

Repair an open or high resistance in the HFT/NAVI REMOTE SW wire.?

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	PICK-UP	No button pressed
Resistance	About 47 ?	About 222 ?	About 10 k?

Is the resistance OK?


	YES

Repair an open or high resistance in the AUDIO REMOTE SW wire.?


	NO

Repair an open or high resistance in the REMOTE SW GND wire.?