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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 Pathfinder. 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.
      CONNECTOR TERMINALS CONTINUITY REFERENCE

      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.
    CONNECTOR TERMINALS CONTINUITY REFERENCE

    Terminals Continuity
    Display control unit -
    Connector Terminal
    M95 40 Ground No
    42

    OK or NG 

    OK: GO TO 3.

    NG: Repair harness or connector.

    Fig 1: Checking Continuity Between Audio Unit And Display Control Unit
    G04177826Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Checking Voltage Between Display Control Unit Harness Connector M95 Terminal 42 And Ground
    G04177827Courtesy 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 , "REMOVAL AND INSTALLATION "

    Fig 3: Checking Voltage Between Audio Unit Harness Connector M45 Terminal 65 And Ground
    G04177828Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK 3: AUDIO-TX COMMUNICATION SIGNAL 
    1. Turn ignition switch OFF.
    2. Connect display control unit connector M95.
    3. Turn ignition switch ON.
    4. 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: Checking Signal Between Display Control Unit Connector M95 Terminal 40 And Ground
    G04177829Courtesy 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 , "REMOVAL AND INSTALLATION "

    Fig 5: Checking Signal Between Display Control Unit Harness Connector M95 Terminal 42 And Ground
    G04177830Courtesy of NISSAN MOTOR CO., U.S.A.
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