Display Communication Line Check (Between Display Control Unit and 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 HARNESS
1. Turn ignition switch OFF.
2. Disconnect display unit connector M93 and display control unit connector M95.
3. Check continuity between display control unit and display unit.
  
  Fig 1: Checking Continuity Between Display Control Unit Connector Terminals 36, 38 And Display Unit Connector Terminals 11, 22 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Connector Terminal (Wire Color) Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display control unit and ground.
  
  Fig 3: Connector Terminal (Wire Color) Specifications Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair harness or connector.
CHECK 1: COMMUNICATION SIGNAL (DCU-DSP)
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminal 11 (B/W) and ground.
  
  Fig 4: Checking Voltage Between Display Unit Harness Connector M93 Terminal 11 (B/W) & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Approx. 3.5V or more.
OK or NG
1. OK: GO TO 3.
2. NG: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
CHECK 2: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch OFF.
2. Disconnect display control unit connector M95.
3. Connect display control unit connector.
4. Turn ignition switch ON.
5. Check voltage between display control unit harness connector M95 terminal 38 (L) and ground.
  
  Fig 5: Checking Voltage Between Display Control Unit Harness Connector M95 Terminal 38 (L) & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Approx. 3.5V or more.
OK or NG
1. OK: GO TO 4.
2. NG: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
CHECK 3: COMMUNICATION SIGNAL (DCU-DSP)
1. Turn ignition switch OFF.
2. Connect display unit connector.
3. Turn ignition switch ON.
4. Check signal between display control unit harness connector M95 terminal 36 (B/W) and ground with CONSULT-II or oscilloscope.
  
  Fig 6: Checking Signal Between Display Control Unit Harness Connector M95 Terminal 36 (B/W) & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  36 (B/W) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
1. OK: GO TO 5.
2. NG: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
CHECK 4: COMMUNICATION SIGNAL (DSP-DCU)
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 38 (L) and ground with CONSULT-II or oscilloscope.
  
  Fig 7: Checking Signal Between Display Control Unit Harness Connector M95 Terminal 38 (L) & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  38 (L) Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
1. OK: Inspection End.
2. NG: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".