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Home › Infiniti › 2009 › M45 Base › Repair and Diagnosis › External Pages › Different car › Section 81 (Body, Lock & Security System) › Back Door Auto Closure System › Check Half-Latch Switch

Check Half-Latch Switch

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HALF-LATCH SWITCH SIGNAL 
    1. Turn ignition switch OFF.
    2. Check the signal between back door closure control unit connector and ground with oscilloscope.
      Fig 1: Identifying Signal Between Back Door Closure Control Unit Connector And Ground
      G05221002G05220996Courtesy of NISSAN MOTOR CO., U.S.A.NISSAN MOTOR CO., U.S.A.
      HALF-LATCH SWITCH SIGNAL

      Connector Terminals (Wire color) Back door condition Signal (Reference value)
      (+) (-)
      D106 7 (OR) Ground Fully open → fully closed
      G05220996Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Half-latch switch is OK.

    NG: GO TO 2.

  2. CHECK HARNESS CONTINUITY 
    1. Disconnect back door closure control unit and back door closure motor connector.
    2. Check continuity between back door closure control unit connector D106 terminal 7 and back door closure motor connector D109 terminal 6.

      7 (OR) - 6 (OR) : Continuity should exist. 

    3. Check continuity between back door closure control unit connector D106 terminal 7 and ground.

      7 (OR) - Ground : Continuity should not exist. 

      Fig 2: Identifying Continuity Between Back Door Closure Control Unit Connector D106 Terminal 7 And Ground
      G05221003Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace harness.

  3. CHECK GROUND CIRCUIT 

    Check continuity between back door closure motor connector D109 terminal 8 and ground.

    8 (B) - Ground : Continuity should exist. 

    Fig 3: Identifying Continuity Between Back Door Closure Motor Connector D109 Terminal 8 And Ground
    G05220826Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace harness.

  4. CHECK BACK DOOR CLOSURE CONTROL UNIT OUTPUT SIGNAL 
    1. Connect back door closure control unit connector.
    2. Check voltage between back door closure control unit connector D106 terminal 7 and ground.

      Back door is closed 

      7 (OR) - Ground : Battery voltage 

      Fig 4: Identifying Voltage Between Back Door Closure Control Unit Connector D106 Terminal 7 And Ground
      G05221005Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Replace back door lock assembly.

    NG: Replace back door closure control unit.

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