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Front Lifting Motor Circuit Check

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT END SEAT LIFTING MECHANISM 

    Check the following.

    • Operation malfunction caused by lifter mechanism deformation or pinched harness or other foreign materials
    • Operation malfunction caused by foreign materials adhered to the lifter motor or lead screws
    • Operation malfunction and interference with other parts by installation

    OK or NG

    1. OK: GO TO 2.
    2. NG: Repair the malfunctioning part and check again.
  2. CHECK FUNCTION 

    With CONSULT-II 

    Check operation with "SEAT LIFTER FR" in ACTIVE TEST.

    FRONT LIFTING MOTOR CIRCUIT CHECK CHART

    Test item Description
    SEAT LIFTER FR The front end lifter motor is activated by receiving the drive signal.
    Fig 1: Scan Tool Displaying Active Test
    G03497704Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    GO TO 3.

    OK or NG

    1. OK: Front lifting motor circuit is OK
    2. NG: GO TO 3.
  3. CHECK FRONT LIFTING MOTOR CIRCUIT HARNESS CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect driver seat control unit connector and front lifting motor connector.
    3. Check continuity between driver seat control unit connector B304 terminals 37 (V), 45 (O) and front lifting motor connector B309 terminals 37 (V), 45 (O).

      37 (V) - 37 (V): Continuity should exist. 

      45 (O) - 45 (O): Continuity should exist. 

    4. Check continuity between driver seat control unit connector B304 terminals 37 (V), 45 (O) and ground.

      37 (V) - Ground: Continuity should not exist. 

      45 (O) - Ground: Continuity should not exist. 

      Fig 2: Checking Continuity Between Driver Seat Control Unit Connector B304 Terminals 37, 45 And Ground
      G03497705Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 4.
    2. NG: Repair or replace harness between driver seat control unit and front lifting motor.
  4. CHECK DRIVER SEAT CONTROL UNIT OUTPUT SIGNAL 
    1. Connect the driver seat control unit connector and front lifting motor connector.
    2. Check voltage between driver seat control unit connector and ground.
      VOLTAGE CHECK CHART

      Connector Terminals (Wire color) Condition Voltage (V) (Approx)
      (+) (-)
      B304 37 (V) Ground Front lifting switch ON (DOWN operation) Battery voltage
      Front lifting switch OFF 0
      45 (O) Front lifting switch ON (UP operation) Battery voltage
      Front lifting switch OFF 0
      Fig 3: Checking Voltage Between Driver Seat Control Unit Connector And Ground
      G03497706Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: Replace front lifting motor.
    2. NG: Replace driver seat control unit.
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