Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE CIRCUIT

Turn ignition switch OFF.
Disconnect AV control unit connector and microphone connector.

Check continuity between AV control unit harness connector and microphone harness connector.

AV control unit		Microphone		Continuity
Connector	Terminals	Connector	Terminals	Continuity
M210	71	R17	2	Existed
	72		4
	87		1

Check continuity between AV control unit harness connector and ground.

AV control unit		Ground	Continuity
Connector	Terminals
M210	72		Not existed
	87

Is the inspection result normal?

YES: GO TO 2.

NO: Repair harness or connector.

CHECK VOLTAGE MICROPHONE VCC

Connect AV control unit connector.
Turn ignition switch ON.

Check voltage between AV control unit harness connector.

(+)		(-)		Voltage (Approx.)
AV control unit		AV control unit
Connector	Terminal	Connector	Terminal
M210	72	M210	71	5.0 V

Is the inspection result normal?

YES: GO TO 3.

NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION ".

CHECK MICROPHONE SIGNAL

Connect microphone connector.

Check signal between AV control unit harness connector.

(+)		(-)		Condition
AV control unit		AV control unit
Connector	Terminal	Connector	Terminal
M210	87	M210	71	Give a voice.

Is the inspection result normal?

YES: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION ".

NO: Replace microphone. Refer to "REMOVAL AND INSTALLATION ".