AV CONTROL UNIT : Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK FUSES

   Check that the following fuses of the AV control unit are not are not blown.

   TERMINAL REFERENCE
   
   

   Unit	Terminals	Signal name	Fuse No.
   AV control unit	19	Battery power	31
   	7	Ignition switch ACC or ON	4
   	104	Ignition switch ON or START	12

   Are the fuses OK? 

   YES: GO TO  2.

   NO: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2. POWER SUPPLY CIRCUIT CHECK
   1. Disconnect AV control unit connectors M160 and M166.
   2. Check voltage between the AV control unit connectors M160 and M166 and ground.
      VOLTAGE SPECIFICATION
      
      

      (+)		(-)	OFF	ACC	ON
      Connector	Terminal
      M160	7	Ground	0V	Battery voltage	Battery voltage
      	19	Ground	Battery voltage	Battery voltage	Battery voltage
      M166	104	Ground	0V	0V	Battery voltage

      Fig 1: Checking Voltage Between AV Control Unit Connectors M160 And M166

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

      Are the voltage results as specified? 

      YES: GO TO  3.

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
3. GROUND CIRCUIT CHECK
   1. Turn ignition switch OFF.
   2. Check continuity between AV control unit harness connectors M160, M171 and M166 and ground.
      CONTINUITY CHART
      
      

      (+)		(-)	Continuity
      Connector	Terminal
      M160	20	Ground	Yes
      M171	54
      M166	85

      Are the continuity results as specified? 

      YES: Inspection End.

      NO: Repair AV control unit ground.

      Fig 2: Checking Continuity Between AV Control Unit Harness Connectors M160, M171 And M166

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