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 TEL ADAPTER UNIT AND MICROPHONE CIRCUIT

Turn ignition switch OFF.
Disconnect TEL adapter unit connector and microphone connector.

Check continuity between TEL adapter unit harness connector and microphone harness connector.

TEL adapter unit		Microphone		Continuity
Connector	Terminals	Connector	Terminals	Continuity
B237	7	R17	1	Existed
	8		2
	29		4

Check continuity between TEL adapter unit harness connector and ground.

TEL adapter unit		Ground	Continuity
Connector	Terminals
M237	7		Not existed
	29

Is the inspection result normal?

YES: GO TO 2.

NO: Repair harness or connector.

CHECK VOLTAGE MICROPHONE VCC

Connect TEL adapter unit connector.
Turn ignition switch ON.

Check voltage between TEL adapter unit harness connector.

(+)		(-)		Voltage (Approx.)
TEL adapter unit		TEL adapter unit
Connector	Terminal	Connector	Terminal
B237	29	B237	8	5.0 V

Is the inspection result normal?

YES: GO TO 3.

NO: Replace TEL adapter unit. Refer to "REMOVAL AND INSTALLATION ".

CHECK MICROPHONE SIGNAL

Connect microphone connector.

Check signal between TEL adapter unit harness connector.

(+)		(-)		Condition
TEL adapter unit		TEL adapter unit
Connector	Terminal	Connector	Terminal
B237	7	B237	8	give a voice.

Is the inspection result normal?

YES: Replace TEL adapter unit. Refer to "REMOVAL AND INSTALLATION ".

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