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Check Unlock Sensor (Without Intelligent Key)

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 UNLOCK SENSOR SIGNAL 
    1. Turn ignition switch OFF.
    2. Check voltage between back door closure control unit connector and ground.
      Fig 1: Identifying Voltage Between Back Door Closure Control Unit Connector And Ground
      G05221027Courtesy of NISSAN MOTOR CO., U.S.A.
      UNLOCK SENSOR SIGNAL

      Connector Terminals (Wire color) Condition Voltage (V) (Approx.)
      (+) (-)
      D106 5 (W) Ground Passenger side door lock is locked 5
      Passenger side door lock is unlocked 0

    OK or NG 

    OK: Unlock sensor is OK.

    NG: GO TO 2.

  2. CHECK HARNESS CONTINUITY 
    1. Disconnect back door closure control unit and front door lock assembly (passenger side) connector.
    2. Check continuity between back door closure control unit connector D106 terminal 5 and front door lock assembly (passenger side) connector D40 terminal 5.

      5 (W) - 5 (W) : Continuity should exist. 

      Fig 2: Identifying Continuity Between Back Door Closure Control Unit Terminal 5 And Front Door Lock Assembly Terminal 5
      G05221028Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace harness between back door closure control unit and front door lock assembly (passenger side).

  3. CHECK GROUND CIRCUIT 

    Check continuity between front door lock assembly (passenger side) connector D40 terminal 4 and ground.

    4 (B) - Ground : Continuity should exist. 

    Fig 3: Identifying Continuity Between Front Door Lock Assembly Connector D40 Terminal 4 And Ground
    G05221029Courtesy 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 5 and ground.

      5 (W) - Ground : Approx. 5V 

      Fig 4: Identifying Voltage Between Back Door Closure Control Unit Connector D106 Terminal 5 And Ground
      G05221027Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Replace front door lock assembly (passenger side).

    NG: Replace back door closure control unit.

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