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

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. 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 of audio unit. Refer to "POWER SUPPLY CIRCUIT INSPECTION  ".

    OK or NG 

    1. OK : GO TO 2.
    2. NG : Check the malfunctioning parts.
  2. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect audio unit connector and display control unit connector.
    3. Check continuity between audio unit and display control unit.
      Fig 1: Terminal Continuity Specification
      G02365681Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between display control unit and ground.
      Fig 2: Checking Continuity Between Audio Unit And Display Control Unit
      G02365682Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Terminal Continuity Specification
      G02365683Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : GO TO 3.
    2. 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 M76 terminal 40 (LG) and ground.
      1. Approx. 3.5 V or more 

    OK or NG 

    1. OK : GO TO 4.
    2. NG : Replace display control unit.
    Fig 4: Checking Voltage Between Display Control Unit Harness Connector M76 Terminal 40 (LG) And Ground
    G02365684Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK 2: AUDIO-RX COMMUNICATION SIGNAL 
    1. Turn ignition switch OFF.
    2. Connect audio unit connector.
    3. Turn ignition switch ON.
    4. Check voltage between display control unit harness connector M76 terminal 42 (B/Y) and ground.
      1. Approx. 3.5 V or more 

    OK or NG 

    1. OK : GO TO 5.
    2. NG : Replace audio unit.
    Fig 5: Checking Voltage Between Display Control Unit Harness Connector M76 Terminal 42 (B/Y) And Ground
    G02365685Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK 3: AUDIO-TX COMMUNICATION SIGNAL 

    Check signal between display control unit harness connector M76 terminal 40 (LG) and ground with CONSULT-II or oscilloscope.

    1. 40 (LG) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT   ". 

    OK or NG 

    1. OK : GO TO 6.
    2. NG : Replace audio unit.
    Fig 6: Checking Signal Between Display Control Unit Harness Connector M76 Terminal 40 (LG) And Ground
    G02365686Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK 4: AUDIO-RX COMMUNICATION SIGNAL 

    Check signal between display control unit harness connector M76 terminal 42 (B/Y) and ground with CONSULT-II or oscilloscope.

    1. 42 (B/Y) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT   ". 

    OK or NG 

    1. OK : Replace audio unit.
    2. NG : Replace display control unit.
    Fig 7: Checking Signal Between Display Control Unit Harness Connector M76 Terminal 42 And Ground
    G02365687Courtesy of NISSAN MOTOR CO., U.S.A.
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