AV CONTROL UNIT: Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - WITH NAVIGATION SYSTEM ".

1. CHECK FUSES

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

   Unit	Terminals	Signal name	Fuse No.
   AV control unit	19, 69, 71	Battery power	29
   	7, 72	Ignition switch ACC or ON	4
   	82	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 M39 and M48.
   2. Check voltage between the AV control unit connectors M39 and M48 and ground.

      (+)		(-)	OFF	ACC	ON
      Connector	Terminal
      M39	7	Ground	0V	Battery voltage	Battery voltage
      	19	Ground	Battery voltage	Battery voltage	Battery voltage
      M48	69	Ground	Battery voltage	Battery voltage	Battery voltage
      	71	Ground	Battery voltage	Battery voltage	Battery voltage
      	72	Ground	0V	Battery voltage	Battery voltage
      	82	Ground	0V	0V	Battery voltage

   Fig 1: Checking Voltage Between AV Control Unit Connectors M39, M48 Terminals And Ground

   Courtesy of NISSAN NORTH AMERICA, INC.

   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. Ignition OFF.
   2. Check continuity between AV control unit harness connector M39, M48 and ground.

   (+)		(-)	Continuity
   Connector	Terminal
   M39	20	Ground	Yes
   M48	68
   	70
   	87
   	89
   	90

   Are the continuity results as specified? 

   YES: Inspection End.

   NO: Repair AV control unit ground.