Power Supply and Ground Circuit Check for NAVI Control Unit

WARNING: This page is about a different car, the 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE
- Check that the following fuses of the NAVI control unit are not blown.
  
  Fig 1: Checking Fuses Of NAVI Control Unit
  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 SYSTEM WIRING DIAGRAMS article.
POWER SUPPLY CIRCUIT CHECK
1. Disconnect the NAVI control unit connector.
2. Check voltage between the following harness connector terminals and ground.
  
  Fig 2: Checking Voltage Between Harness Connector Terminals And Ground (1 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between Harness Connector Terminals And Ground (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK : GO TO 3.

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

Fig 4: Checking Continuity Between NAVI Control Unit And Ground (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking Continuity Between NAVI Control Unit And Ground (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK : Inspection end.

NG : Repair or replace harness.