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Power Supply and Ground Circuit Check for Display Unit

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY AND GROUND CIRCUIT FOR DISPLAY CONTROL UNIT 
    1. Check power supply and ground circuit for display control unit. Refer to "POWER SUPPLY AND GROUND CIRCUIT CHECK FOR DISPLAY CONTROL UNIT ".

    OK or NG 

    • OK : GO TO 2.
    • NG : Repair malfunctioning part.
  2. CHECK POWER SUPPLY CIRCUIT FOR DISPLAY UNIT 
    1. Disconnect display unit connector M93.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M93 terminals 2, 3 and ground.

      Approx. 9V 

    OK or NG 

    • OK : GO TO  4.
    • NG : GO TO 3.
      Fig 1: Identifying Voltage Between Display Unit Harness Connector M93 Terminals 2, 3 And Ground
      G04137034Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect display control unit connector M94.
    3. Check continuity between display control unit harness connector M94 terminals 2, 4 and display unit harness connector M93 terminals 2, 3.
      TERMINALS CONTINUITY DESCRIPTION

      Terminals Continuity
      Display control unit Display unit
      Connector Terminal Connector Terminal
      M94 2 M93 2 Yes
      4 3
    4. Check continuity between display unit and ground.
      TERMINALS CONTINUITY DESCRIPTION

      Terminals Continuity
      Display unit -
      Connector Terminal
      M93 2 Ground No
      3
      Fig 2: Identifying Continuity Between Display Unit And Ground
      G04137035Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

  4. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between display unit harness connector M93 terminals 13, 14 and ground.

      Continuity should exist. 

    OK or NG 

    • OK : GO TO  6.
    • NG : GO TO 5.
      Fig 3: Identifying Continuity Between Display Unit Harness Connector M93 Terminals 13, 14 And Ground
      G04137036Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK HARNESS 
    1. Disconnect display control unit connector M94.
    2. Check continuity between display unit harness connector M93 terminals 13, 14 and display control unit harness connector M94 terminals 5, 7.

      Continuity should exist. 

    OK or NG 

    • OK : Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
    • NG : Repair harness.
      Fig 4: Identifying Connector M93 Terminals 13, 14 And Display Control Unit Harness Connector M94 Terminals 5, 7
      G04137037Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK GROUND CIRCUIT 

    Check continuity between display unit and ground as follows.

    TERMINALS CONTINUITY DESCRIPTION

    Terminals Ignition switch Continuity
    Connector Terminal -
    M93 1 Ground OFF Yes

    OK or NG 

    • OK : Inspection End.
    • NG : Repair harness.
      Fig 5: Identifying Continuity Between Display Unit And Ground
      G04137038Courtesy of NISSAN MOTOR CO., U.S.A.
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