Diagnosis Procedure

WARNING: This page is about a different car, the 2010 Infiniti G37. 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.

CONTINUITY CHART

TEL adapter unit		Microphone		Continuity
Connector	Terminals	Connector	Terminals	Continuity
B237	7	R7	1	Existed
	8		2
	29		4

Check continuity between TEL adapter unit harness connector and ground.

CONTINUITY CHART

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 REFERENCE CHART

(+)		(-)		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 "EXPLODED VIEW ".

CHECK MICROPHONE SIGNAL

Connect microphone connector.

Check signal between TEL adapter unit harness connector.

TEL ADAPTER UNIT CONNECTOR TERMINALS REFERENCE CHART

(+)		(-)		Condition	Reference value
TEL adapter unit		TEL adapter unit
Connector	Terminal	Connector	Terminal
B237	7	B237	8	give a voice.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: Replace TEL adapter unit. Refer to "EXPLODED VIEW ".

NO: Replace microphone. Refer to "EXPLODED VIEW ".