Display Communication Line Check (Between Display Control Unit and Display Unit)

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