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Check Front Lifting Switch Circuit

  1. CHECK FUNCTION 

    With CONSULT-II 

    With "LIFT FR SW-UP, LIFT FR SW-DN" on the DATA MONITOR, operate the front lifting switch to check ON/OFF operation.

    MONITOR ITEM AND CONTENTS REFERENCE

    Monitor item [OPERATION or UNIT] Contents
    LIFT FR SW - DN "ON/OFF" Operation (ON)/open (OFF) status judged from the FR lifter switch (DOWN) signal is displayed.
    LIFT RR SW - UP "ON/OFF" Operation (ON)/open (OFF) status judged from the RR lifter switch (UP) signal is displayed.
    Fig 1: Display CONSULT II - Data Monitor Screen
    G04130187Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Carry out "SWITCH MONITOR" in the on-board diagnosis function, and operate the front lifting switch to check. Refer to "SWITCH MONITOR ".

    OK or NG 

    • OK : Replace the driver seat control unit.
    • NG : GO TO 2
  2. CHECK FRONT LIFTING SWITCH INPUT/OUTPUT 
    1. Turn ignition switch OFF.
    2. Check voltage between driver seat control unit connector and ground.
      CONNECTORS VOLTAGE REFERENCE

      Connector Terminals (Wire color) Condition Voltage (V) (Approx.)
      (+) (-)
      B143 19 (L/R) Ground Front lifting switch ON (UP operation) 0
      Front lifting switch OFF 5
      25 (OR/B) Front lifting switch ON (DOWN operation) 0
      Front lifting switch OFF 5
      Fig 2: Identifying Voltage Between Driver Seat Control Unit Connector And Ground
      G04130188Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : System is OK.
    • NG : GO TO 3.
  3. CHECK HARNESS CONTINUITY 
    1. Disconnect driver seat control unit connector and power seat switch (driver side) connector.
    2. Check continuity between driver seat control unit connector B143 terminals 19, 25 and driver seat switch connector B144 terminals 19, 25.

      19 (L/R) - 19 (L/R) : Continuity should exist. 

      25 (OR/B) - 25 (OR/B) : Continuity should exist. 

    3. Check continuity between driver seat control unit connector B143 terminals 19, 25 and ground

      19 (L/R) - Ground : Continuity should not exist. 

      25 (OR/B) - Ground : Continuity should not exist. 

      Fig 3: Identifying Continuity Between Driver Seat Control Unit Connector B143 Terminals 19, 25 And Ground
      G04130189Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : GO TO 4.
    • NG : Repair or replace harness between driver seat control unit and power seat switch (driver side).
  4. CHECK FRONT END LIFTING SWITCH 

    Check continuity between driver seat control unit connector B144 terminal 19, 25 and 15.

    CONNECTORS CONTINUITY REFERENCE

    Connector Terminals Condition Continuity
    B144 19 15 Front lifting switch ON (UP operation) Yes
    Front lifting switch OFF No
    25 Front lifting switch ON (DOWN operation) Yes
    Front lifting switch OFF No
    Fig 4: Identifying Continuity Between Driver Seat Control Unit Connector B144 Terminal 19, 25 And 15
    G04130190Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : GO TO 5.
    • NG : Replace power seat switch (driver side).
  5. CHECK POWER SEAT SWITCH GROUND CIRCUIT 

    Check continuity between power seat switch connector B144 terminal 15 and ground.

    15 (B) - Ground : Continuity should exist. 

    Fig 5: Identifying Continuity Between Power Seat Switch Connector B144 Terminal 15 And Ground
    G04130191Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK : Check the condition of the harness and connector.
    • NG : Repair or replace harness between power seat switch (driver side) and ground.
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