Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS BETWEEN BLUETOOTH CONTROL UNIT AND MICROPHONE

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

Check continuity between Bluetooth control unit harness connector B142 (A) and microphone harness connector R109 (B).

CONTINUITY CHART

A		B		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B142	7	R109	1	Yes
	8		2
	29		4

Check continuity between Bluetooth control unit harness connector B142 (A) and ground.

CONNECTOR TERMINAL CONTINUITY CHART

A		-	Continuity
Connector	Terminal	-	Continuity
B142	7	Ground	No
	8
	29

Fig 1: Checking Continuity Between Bluetooth Control Unit Connector B142 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Are the continuity test results as specified?

Yes: GO TO 2

No: Repair harness or connector.

CHECK MICROPHONE POWER SUPPLY
1. Connect Bluetooth control unit connector and microphone connector.
2. Turn ignition switch ON.
3. Check voltage between microphone harness connector R109 terminal 4 and ground.
4 - Ground : Approx. 5V

Fig 2: Checking Voltage Between Microphone Harness Connector Terminal 4 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Is voltage reading approx. 5 volts?

Yes: GO TO 3

No: Replace Bluetooth control unit. Refer to , "REMOVAL AND INSTALLATION ".

CHECK MICROPHONE SIGNAL

Check signal between Bluetooth control unit harness connector B142 terminals 7 and 8 with CONSULT-III or and oscilloscope.

CONNECTOR TERMINAL SIGNAL CHART

Connector	(+)	(-)	Reference signal
Connector	Terminal	Terminal	Reference signal
B142	7	8	While speaking into MIC Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Signal Between Bluetooth Control Unit Harness Connector B142 Terminals 7 And 8

Courtesy of NISSAN MOTOR CO., U.S.A.

Are voltage readings as specified?

Yes: Replace Bluetooth control unit. Refer to , "REMOVAL AND INSTALLATION ".

No: Replace microphone. Refer to , "REMOVAL AND INSTALLATION ".