Diagnosis Procedure

Check front display unit power supply and ground circuit. Refer to "FRONT DISPLAY UNIT : DIAGNOSIS PROCEDURE ".

Is the inspection result normal? 

YES: GO TO 2.

NO: Repair malfunctioning parts.

1. Turn ignition switch OFF.
2. Disconnect front display unit connector and AV control unit connector.
3. Check continuity between front display unit harness connector and AV control unit harness connector.
   CONTINUITY REFERENCE CHART
   
   

   Front display unit		AV control unit		Continuity
   Connector	Terminals	Connector	Terminals
   M75	11	M86	70	Existed
   	22		71

4. Check continuity between front display unit harness connector and ground.
   CONTINUITY REFERENCE CHART
   
   

   Front display unit		Ground	Continuity
   Connector	Terminals
   M75	11		Not existed
   	22

   Is the inspection result normal? 

   YES: GO TO 3.

   NO: Repair harness or connector.

1. Connect front display unit connector and AV control unit connector.
2. Turn ignition switch ON.
3. Check signal between front display unit harness connector terminal and ground using an oscilloscope.
   SIGNAL WAVEFORM REFERENCE CHART
   
   

   (+)		(-)	Condition	Reference value
   Front display unit
   Connector	Terminal
   M75	11	Ground	When adjusting display brightness.	Courtesy of NISSAN MOTOR CO., U.S.A.

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Replace AV control unit.

Check signal between display unit harness connector and ground using an oscilloscope.

(+)		(-)	Condition	Reference value
Front display unit
Connector	Terminal
M75	22	Ground	When adjusting display brightness.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal? 

YES: INSPECTION END

NO: Replace front display unit. (+)