Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to WIRING DIAGRAM (Bose Audio w/Navi w/o Surround) or WIRING DIAGRAM (Bose Audio w/Navi and Surround).

CHECK DCM MIC SIGNAL CIRCUIT AND DCM MIC VCC CIRCUIT CONTINUITY

Turn ignition switch OFF.
Disconnect TCU connector M47 and AV control unit connector.

Check continuity between TCU connector M47 and AV control unit connector.

BOSE AUDIO W/NAVI W/O SURROUND

TCU		AV control unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M47	21	M124	60	Yes
	22		75
	23		59

BOSE AUDIO W/NAVI AND SURROUND

TCU		AV control unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M47	21	M163	60	Yes
	22		75
	23		59

Check the continuity between TCU connector M47 and ground.

TCU		Ground	Continuity
Connector	Terminal
M47	21	-	No
	22

Is the inspection result normal?

YES

GO TO 2 .

Repair or replace harness or connectors.

CHECK DCM MIC VCC VOLTAGE

Connect TCU connector M47 and AV control unit connector.
Turn ignition switch ON.

Check voltage between AV control unit connector terminals.

AV control unit connector		Voltage (Approx.)
(+)	(-)
Terminal	Terminal
60	59	5.0 V

Is the inspection result normal?

YES

GO TO 3 .

Replace TCU. Refer to REMOVAL AND INSTALLATION .

CHECK DCM MIC SIGNAL

Check signal between AV control unit connector.

AV control unit connector		Condition	Reference value
(+)	(-)
Terminal	Terminal
75	59	Speak into microphone.	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

Replace AV control unit. Refer to REMOVAL AND INSTALLATION .

Replace TCU. Refer to REMOVAL AND INSTALLATION .