Power Supply and Ground Circuit Inspection for AV Control Unit

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE
Check AV control unit fuses are not blown.

Fig 1: Checking Fuse
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK >> GO TO 2.

NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
CHECK POWER SUPPLY CIRCUIT
1. Disconnect AV control unit connector.
2. Check voltage between AV control unit and ground.
  
  Fig 2: Checking Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Identifying Terminal And Ignition Switch Position
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> GO TO 3.

NG >> Check harness for open or short between AV control unit and fuse.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between AV control unit harness connector M78 terminals 1 (B), 4 (B) and ground.
  1. Continuity should exist.
OK or NG

OK >> Inspection end.

NG >> Repair harness or connector.