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

  1. CHECK POWER SUPPLY AND GROUND CIRCUIT 
    1. Check power supply and ground circuit for audio unit. Refer to "POWER SUPPLY CIRCUIT INSPECTION ".

    OK or NG 

    • OK : GO TO 2.
    • NG : Check the malfunctioning parts.
  2. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect audio unit connector M45 and display control unit connector M95.
    3. Check continuity between audio unit and display control unit.
      TERMINALS CONTINUITY DESCRIPTION

      Terminals Continuity
      Display control unit Audio unit
      Connector Terminal Connector Terminal
      M95 40 M45 65 Yes
      42 66
    4. Check continuity between display control unit and ground.
      TERMINALS CONTINUITY DESCRIPTION

      Terminals Continuity
      Display control unit -
      Connector Terminal
      M95 40 Ground No
      42
      Fig 1: Identifying Continuity Between Display Control Unit And Ground
      G04137054Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : GO TO 3.
    • NG : Repair harness or connector.
  3. CHECK 1: AUDIO-TX COMMUNICATION SIGNAL 
    1. Connect display control unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between display control unit harness connector M95 terminal 42 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 2: Identifying Voltage Between Display Control Unit Harness Connector M95 Terminal 42 And Ground
      G04137055Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK 2: AUDIO-RX COMMUNICATION SIGNAL 
    1. Turn ignition switch OFF.
    2. Disconnect display control unit connector M95.
    3. Connect audio unit connector M45.
    4. Turn ignition switch ON.
    5. Check voltage between audio unit harness connector M45 terminal 65 and ground.

      Approx. 3.5V or more. 

    OK or NG 

    • OK : GO TO 5.
    • NG : Replace audio unit. Refer to "AUDIO UNIT ".
      Fig 3: Identifying Voltage Between Audio Unit Harness Connector M45 Terminal 65 And Ground
      G04137056Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK 3: AUDIO-TX COMMUNICATION SIGNAL 

    Check signal between display control unit harness connector M95 terminal 40 and ground with CONSULT-II or oscilloscope.

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

    OK or NG 

    • OK : GO TO 6.
    • NG : Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
      Fig 4: Identifying Signal Between Display Control Unit Harness Connector M95 Terminal 40 And Ground
      G04137057Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK 4: AUDIO-RX COMMUNICATION SIGNAL 
    1. Turn ignition switch ON.
    2. Check signal between display control unit harness connector M95 terminal 42 and ground with CONSULT-II or oscilloscope.

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

    OK or NG 

    • OK : Inspection End.
    • NG : Replace audio unit. Refer to "AUDIO UNIT ".
      Fig 5: Identifying Signal Between Display Control Unit Harness Connector M95 Terminal 42 And Ground
      G04137058Courtesy of NISSAN MOTOR CO., U.S.A.
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