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

  1. 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.
      TERMINALS CONTINUITY DESCRIPTION

      Terminals Continuity
      Display control unit Display unit
      Connector Terminal Connector Terminal
      M95 36 M93 11 Yes
      38 22
    4. Check continuity between display control unit and ground.
      TERMINALS CONTINUITY DESCRIPTION

      Terminals Continuity
      Display control unit -
      Connector Terminal
      M95 36 Ground No
      38
      Fig 1: Identifying Continuity Between Display Control Unit And Ground
      G04137059Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : GO TO 2.
    • NG : Repair harness or connector.
  2. 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 and ground.

      Approx. 3.5V or more. 

    OK or NG 

    • OK : GO TO 3.
    • NG : Replace display unit. Refer to "DISPLAY UNIT ".
      Fig 2: Identifying Voltage Between Display Unit Harness Connector M93 Terminal 11 And Ground
      G04137060Courtesy of NISSAN MOTOR CO., U.S.A.
  3. 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 and ground.

      Approx. 3.5V or more. 

    OK or NG 

    • OK : GO TO 4.
    • NG : Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
      Fig 3: Identifying Voltage Between Display Control Unit Harness Connector M95 Terminal 38 And Ground
      G04137061Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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 and ground with CONSULT-II or oscilloscope.

      36 - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT  ". 

      Fig 4: Identifying Signal Between Display Control Unit Harness Connector M95 Terminal 36 And Ground
      G04137062Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

  5. CHECK 4: COMMUNICATION SIGNAL (DSP-DCU) 
    1. Turn ignition switch ON.
    2. Check signal between display control unit harness connector M95 terminal 38 and ground with CONSULT-II or oscilloscope.

      38 - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT  ". 

    OK or NG 

    • OK : Inspection End.
    • NG : Replace display unit. Refer to "DISPLAY UNIT ".
      Fig 5: Identifying Signal Between Display Control Unit Harness Connector M95 Terminal 38 And Ground
      G04137063Courtesy of NISSAN MOTOR CO., U.S.A.
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