Power Supply and Ground Circuit Check for NAVI Control Unit

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE
Make sure the following fuses of the NAVI control unit are not blown.

Fig 1: NAVI Control Unit - Fuse Check Reference
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. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
CHECK POWER SUPPLY CIRCUIT
1. Disconnect NAVI control unit connector B151.
2. Check voltage between connector terminals and ground as follows.
  
  Fig 2: NAVI Control Unit Connector B151 Terminals And Ground Voltage Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between NAVI Control Unit Connector Terminals And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 3.
- NG: Check harness for open between NAVI control unit and fuse.
CHECK GROUND CIRCUIT
Check continuity between the following NAVI control unit connector terminals and ground.

Fig 4: NAVI Control Unit Connector Terminals And Ground Continuity Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking Continuity Between NAVI Control Unit Connector Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK: Inspection End.
- NG: Repair or replace harness.