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

WARNING: This page is about a different car, the 2006 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  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.
      AUDIO UNIT AND DISPLAY CONTROL UNIT

      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.
      DISPLAY CONTROL UNIT AND GROUND

      Terminals Continuity
      Display control unit -
      Connector Terminal
      M95 40 Ground No
      42
      Fig 1: Checking Continuity Between Audio Unit & Display Control Unit And Display Control Unit & Ground
      G04201803Courtesy 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 M95.
    2. Turn ignition switch ON.
    3. Check voltage between display control unit harness connector M95 terminal 42 and ground.

      Approx. 3.5V or more. 

    Fig 2: Checking Voltage Between Display Control Unit And Ground
    G04201804Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Replace display control unit. Refer to , "DISPLAY CONTROL UNIT ".

  4. CHECK 2: AUDIO-RX COMMUNICATION SIGNAL 
    1. Turn ignition switch OFF.
    2. Disconnect display control unit connector M95.
    3. Connect audio unit connector.
    4. Turn ignition switch ON.
    5. Check voltage between audio unit harness connector M45 terminal 65 and ground.

      Approx. 3.5V or more. 

    Fig 3: Checking Voltage Between Audio Unit And Ground
    G04201805Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 5.

    NG: Replace audio unit. Refer to , "AUDIO UNIT ".

  5. CHECK 3: AUDIO-TX COMMUNICATION SIGNAL 
    1. Turn ignition switch OFF.
    2. Connect display control unit connector.
    3. Turn ignition switch ON.
    4. Check signal between display control unit harness connector M95 terminal 40 and ground with CONSULT-ll or oscilloscope.

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

    Fig 4: Checking Voltage Between Display Control Unit And Ground
    G04201806Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 6.

    NG: Replace display control unit. Refer to , "DISPLAY CONTROL UNIT ".

  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-ll or oscilloscope.

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

      Fig 5: Checking Voltage Between Display Control Unit And Ground
      G04201807Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Inspection End.

    NG: Replace audio unit. Refer to , "AUDIO UNIT ".

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