Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

DETERMINE MALFUNCTION TYPE
With CONSULT
1. Turn ignition switch ON.
2. Turn ignition switch OFF and wait at least 30 seconds.
3. Turn ignition switch ON and wait at least 30 seconds or more.
4. Select "Self Diagnostic Result" mode of "MULTI AV" using CONSULT.
5. Check DTC.
Is DTC U175D detected?

YES

GO TO 2.

YES

GO TO 3.

YES

GO TO 4.

YES

GO TO 5.

NO

Refer to Intermittent Incident .

CHECK SOUND SIGNAL CIRCUITS FOR OPEN

Turn ignition switch OFF.
Disconnect Bose speaker amp. connector B121 and subwoofer connector.

Check the continuity between Bose speaker amp. connector B121 and subwoofer connector B73.

Bose speaker amp.		Subwoofer		Continuity
Connector	Terminal	Connector	Terminal
B121	53	B73	2	Yes
	48		1

Is the inspection result normal?

YES

Replace subwoofer. Refer to Removal and Installation .

Repair or replace harness or connectors.

CHECK SOUND SIGNAL CIRCUITS FOR SHORT

Turn ignition switch OFF.
Disconnect Bose speaker amp. connector B121 and subwoofer connector.

Check the continuity between the terminals of Bose speaker amp. connector B121.

Bose speaker amp.			Continuity
Connector	Terminal
B121	53	48	No

Is the inspection result normal?

YES

Replace subwoofer. Refer to Removal and Installation .

Repair or replace harness or connectors.

CHECK SOUND SIGNAL CIRCUITS FOR SHORT TO GROUND

Turn ignition switch OFF.
Disconnect Bose speaker amp. connector B121 and subwoofer connector.

Check the continuity between Bose speaker amp. connector B121 and ground.

Bose speaker amp.		Continuity
Connector	Terminal			Ground
B121	53	--	No
	48

Is the inspection result normal?

YES

Replace subwoofer. Refer to Removal and Installation .

Repair or replace harness or connectors.

CHECK SOUND SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

Turn ignition switch OFF.
Disconnect Bose speaker amp. connector B121 and subwoofer connector.
Turn ignition switch ON.

Check the voltage between Bose speaker amp. connector B121 and ground.

Bose speaker amp.		Ground	Voltage
Connector	Terminal
B121	53	--	0 V
	48

Is the inspection result normal?

YES

Replace subwoofer. Refer to Removal and Installation .

Repair or replace harness or connectors.