Power Supply and Ground Circuit Check for Display Unit and NAVI Switch

WARNING: This page is about a different car, the 2004 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 display unit and NAVI switch are not blown.

Fig 1: Display Unit And NAVI Switch Fuse Checking Table
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: If fuse is blown, be sure to eliminate case of malfunction before installing new fuse. Refer to POWER DISTRIBUTION .
POWER SUPPLY CIRCUIT CHECK
1. Check voltage between display unit and ground.
  
  Fig 2: Display Unit And Ground Voltage Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between Display Unit And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between NAVI switch and ground.
  
  Fig 4: NAVI Switch And Ground Voltage Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Check Voltage Between NAVI Switch And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Check the following.
  - Harness for open or short between display unit and fuse
  - Harness for open or short between NAVI switch and fuse
GROUND CIRCUIT CHECK
1. Disconnect display unit connector.
2. Check continuity between display unit and ground.
  
  Fig 6: Display Unit And Ground Continuity Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 7: Checking Continuity Between Display Unit And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Disconnect NAVI switch connector.
4. Check continuity between NAVI switch harness connector M37 terminal 7 (B) and ground.
  1. Continuity should exist.
OK or NG
1. OK: Inspection end.
2. NG: Repair or replace harness.
Fig 8: Checking Continuity Between NAVI Switch Harness Connector M37 Terminal 7 (B) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.