Audio System Symptom Troubleshooting - Audio remote switch does not work properly (audio unit buttons work) (Without Navigation)

Audio remote 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.

1. 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

Refer to Audio System Symptom Troubleshooting - Multi-information display unit does not work .
2. 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):
- 1. Do the Self-Diagnostic Function - Refer to: How to Troubleshoot the Audio System Audio System Self-Diagnostic Function or the System Diagnostic Mode - Refer to: Audio System Sound Quality Diagnosis Audio 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: With normal audio

Go to step 10.

YES: With display audio

Go to step 11.

NO

Go to step 4.
4. 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

Replace the audio remote/multi-information display switch .

5. 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 .

The AUDIO REMOTE SW wire is not shorted to ground. Go to step 6.

6. 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 .

The TFT INFO wire is not shorted to ground. Go to step 7.

7. 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 Ω	About 357 Ω	About 775 Ω	About 1.7 kΩ	About 3.7 kΩ	About 10 kΩ

Is the resistance OK?

YES

Go to step 8.

Go to step 9.

8. 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 Ω	About 363 Ω	No continuity

Is the resistance OK?

YES

Replace the multi-information display unit .

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):

- 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 Ω	About 363 Ω	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 .

10. 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 unit connector B (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 unit connector B (20P): disconnected
	Multi-information display unit connector A (32P): disconnected
Test point 1	Audio unit connector B (20P) No. 13 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Multi-information display unit connector A (32P) No. 31

Test point 1	Audio unit connector B (20P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Multi-information display unit connector A (32P) No. 15

Is there continuity?

YES

The B-CAN_H and the B-CAN_L wires are OK. Go to step 12.

Repair an open in the wire(s) between the audio unit and the multi-information display unit.

11. 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 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 unit connector C (20P): disconnected
	Multi-information display unit connector A (32P): disconnected
Test point 1	Audio unit connector C (20P) No. 13 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Multi-information display unit connector A (32P) No. 31

Test point 1	Audio unit connector C (20P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
Test point 2	Multi-information display unit connector A (32P) No. 15

Is there continuity?

YES

The B-CAN_H and the B-CAN_L wires are OK. Go to step 12.

Repair an open in the wire(s) between the audio unit and the multi-information display unit.

12. 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

Replace the original multi-information display unit .

NO

Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .