Power Supply And Ground Circuit Check

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
- Make sure the following fuses of the AV and NAVI control unit are not blown.
  
  Fig 1: Fuse Inspection Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> GO TO 2.

NG >> If fuse is blown be sure to eliminate case of malfunction before installing new fuse. Refer to POWER DISTRIBUTION diagram in SYSTEM WIRING DIAGRAMS .
POWER SUPPLY CIRCUIT CHECK
1. Disconnect the AV and NAVI control unit connector.
2. Check voltage between the following AV and NAVI control unit harness connector terminals and ground.
  
  Fig 2: Testing AV & NAVI Control Unit Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Navigation System Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> GO TO 3.

NG >> Check harness for open or short between AV and NAVI control unit and fuse.
GROUND CIRCUIT CHECK
Check continuity between the following AV and NAVI control unit and ground.

Fig 4: Testing AV & NAVI Control Unit Ground Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK >> Inspection end.

NG >> Repair or replace harness.

Fig 5: Checking Navigation System Ground Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.