Power Supply and Ground Circuit Check for Display Unit

WARNING: This page is about a different car, the 2005 Nissan Quest. 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
1. OK: GO TO 2.
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.
  
  Fig 1: Checking Voltage Between Display Unit Connector M93 Terminals 2, 3 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Approx. 9V
OK or NG
1. OK: GO TO 4.
2. 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: Checking Continuity Between Terminals 2, 4 And Terminals 2, 3 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Connector M94 Continuity Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display unit and ground.
  
  Fig 4: Connector M93 Continuity Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
2. NG: Repair harness.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between display unit harness connector M93 terminals 13 (P/B), 14 (LG) and ground.
  
  Fig 5: Checking Continuity Between Terminals 13, 14 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
OK or NG
1. OK: GO TO 6.
2. 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/B), 14 (LG) and display control unit harness connector M94 terminals 5 (P/B), 7 (LG).
  
  Fig 6: Checking Continuity Between Terminals 13, 14 And Terminals 5, 7
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
OK or NG
1. OK: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
2. NG: Repair harness.
CHECK GROUND CIRCUIT
Check continuity between display unit and ground as follows.

Fig 7: Checking Continuity Between Display Unit Terminal 1 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 8: Connector M93 Continuity Table
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Inspection End.
2. NG: Repair harness.