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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 2059 (Audio, Visual, Navigation & Telephone System) >> Navigation System >> Audio Communication Line Check (Between Display Control Unit and Audio Unit)
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Audio Communication Line Check (Between Display Control Unit and Audio Unit)

WARNING: This page is about a different car, the 2007 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY AND GROUND CIRCUIT 

    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 CHART

      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 CHART

      Terminals Continuity
      Display control unit -
      Connector Terminal
      M95 40 Ground No
      42
      Fig 1: Checking Continuity Between Audio Unit And Display Control Unit
      G04904289

    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. 

    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 Connector M95 Terminal 42 And Ground
    G04904290
  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. 

    OK or NG 

    OK: GO TO 5.

    NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION ".

    Fig 3: Checking Voltage Between Audio Unit Connector M45 Terminal 65 And Ground
    G04904291
  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-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
    G04904292
  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 ".

      Fig 5: Checking Signal Between Display Control Unit Connector M95 Terminal 42 And Ground
      G04904293

    OK or NG 

    OK: Inspection End.

    NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION ".

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