Power Supply and Ground Circuit Check for Display 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 POWER SUPPLY AND GROUND CIRCUIT FOR DISPLAY CONTROL UNIT
1. Check power supply and ground circuit for display control unit. Refer to "POWER SUPPLY AND GROUND CIRCUIT CHECK FOR DISPLAY CONTROL UNIT ".
OK or NG
- OK: GO TO 2.
- NG: Repair malfunctioning part.
CHECK POWER SUPPLY CIRCUIT FOR DISPLAY UNIT
1. Disconnect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminals 2 (L/W), 3 (L/R) and ground.
  - Approx. 9V
  Fig 1: Checking Voltage Between Display Unit Harness Connector M93 Terminals 2 (L/W), 3 (L/R) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 4.
- NG: GO TO 3.
CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and display control unit connector M94.
3. Check continuity between display control unit harness connector M94 terminals 2 (L/W), 4 (L/R) and display unit harness connector M93 terminals 2 (L/W), 3 (L/R).
  
  Fig 2: Display Unit Connector M93 And Display Control Unit Connector M94 Terminals, Continuity Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Continuity Between Display Control Unit Connector M94 Terminals 2, 4 And Display Unit Harness Connector M93 Terminals 2 And 3
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display unit and ground.
  
  Fig 4: Display Unit Connector M93 Terminals And Ground Continuity Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
- NG: Repair harness.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between display unit harness connector M93 terminals 13 (P), 14 (P/L) and ground.
  - Continuity should exist.
  Fig 5: Checking Continuity Between Display Unit Harness Connector M93 Terminals 13 (P), 14 (P/L) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 6.
- NG: GO TO 5.
CHECK HARNESS
1. Disconnect display control unit connector M94.
2. Check continuity between display unit harness connector M93 terminals 13 (P), 14 (P/L) and display control unit harness connector M94 terminals 5 (P), 7 (P/L).
  - Continuity should exist.
  Fig 6: Checking Continuity Between Display Unit Harness Connector M93 Terminals 13, 14 And Display Control Unit Harness Connector M94 Terminals 5 And 7
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
- NG: Repair harness.
CHECK GROUND CIRCUIT
Check continuity between display unit and ground as follows.

Fig 7: Display Unit Connector Terminals And Ground Continuity Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 8: Checking Continuity Between Display Unit And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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