Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUITS
Check front display unit power supply and ground circuits. Refer to "FRONT DISPLAY UNIT : DIAGNOSIS PROCEDURE ".

Is inspection result normal?

YES: Go to 2.

NO: Repair malfunctioning parts.

CHECK CONTINUITY COMMUNICATION CIRCUITS

Turn ignition switch OFF.
Disconnect front display unit connector and AV control unit connector.

Check continuity between front display unit harness connector and AV control unit harness connector.

TERMINALS REFERENCE

Front display unit		AV control unit		Continuity
Connector	Terminals	Connector	Terminals	Continuity
M215	9	M210	89	Existed
M215	10	M210	73	Existed

Check continuity between front display unit harness connector and ground.

TERMINALS REFERENCE

Front display unit		Ground	Continuity
Connector	Terminals
M215	9		Not existed
	10

Is inspection result normal?

YES: Go to 3.

NO: Repair harness or connector.

CHECK COMMUNICATION SIGNAL

Connect front display unit connector and AV control unit connector.
Turn ignition switch ON.

Check signal between front display unit harness connector and ground.

SIGNAL REFERENCE

(+)		(-)	Condition	Reference value
Front display unit
Connector	Terminal
M215	9	Ground	When adjusting display brightness.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is inspection result normal?

YES: Go to 4.

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

CHECK COMMUNICATION SIGNAL

Check signal between front display unit harness connector and ground.

SIGNAL REFERENCE

(+)		(-)	Condition	Reference value
Front display unit
Connector	Terminal
M215	10	Ground	When adjusting display brightness.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is inspection result normal?

YES: INSPECTION END

NO: Replace front display unit. Refer to "REMOVAL AND INSTALLATION ".