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Lifting Sensor (Front) Circuit Inspection

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 FUNCTION 

    With CONSULT-II 

    Check operation with "LIFT FR PULSE" on the DATA MONITOR to make sure the pulse changes.

    DATA MONITOR REFERENCE

    Monitor item [OPERATION or UNIT] Contents
    LIFT FR PULSE - The front lifting position (pulse) judged from the lifting sensor (front) is displayed
    Fig 1: CONSULT II Display - DATA MONITOR
    G04902996Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Check signal between driver seat control unit connector and ground, with oscilloscope.
      TERMINALS SIGNAL REFERENCE

      Connector Terminals Condition Signal
      (+) (-)
      B401 25 Ground Lifting motor (front) operation
      G04902967Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Front lifting sensor is OK.

    NG: GO TO 2.

    Fig 2: Checking Signal Between Driver Seat Control Unit Connector Terminal 25 And Ground
    G04903006Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK FRONT LIFTING SENSOR CIRCUIT HARNESS CONTINUITY 
    1. Disconnect driver seat control unit and lifting motor (front).
    2. Check continuity between driver seat control unit connector B401 terminals 16, 25, 31 and lifting motor (front) connector B405 terminals 1, 2, 3.

      16 - 3 : Continuity should exist. 

      25 - 2 : Continuity should exist. 

      31 - 1 : Continuity should exist. 

    3. Check continuity between driver seat control unit connector B401 terminals 16, 25, 31 and ground.

      16 - Ground : Continuity should not exist. 

      25 - Ground : Continuity should not exist. 

      31 - Ground : Continuity should not exist. 

    OK or NG 

    OK: Replace lifting motor (front). Refer to "FRONT SEAT ".

    NG: Repair or replace harness.

    Fig 3: Checking Continuity Between Driver Seat Control Unit Connector B401 Terminals 16, 25, 31 And Ground, And Between Connector B401 Terminals 16, 25, 31 And Lifting Motor (Front) Connector B405 Terminals 1, 2, 3
    G04903007Courtesy of NISSAN MOTOR CO., U.S.A.
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