Front Lifting sensor Circuit Inspection

Check the operation malfunction caused by lifter mechanism deformation or parts are loose.

OK or NG 

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

1. Turn ignition switch OFF.
2. Check signal between driver seat control unit connector and ground, with oscilloscope.
   Fig 1: Driver Seat Control Unit Connector Terminals Signal Reference Chart

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 2: Checking Front Lifting Sensor Input/Output Signal

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: System is OK.
2. NG: GO TO 3.

1. Disconnect driver seat control unit connector and front lifting motor connector.
2. Check continuity between driver seat control unit connector B143 terminals 21 (Y/B), 32 (R/W) and front lifting motor connector B148 terminals 21 (Y/B), 32B (R/W).
   1. 21 (Y/B) - 21 (Y/B): Continuity should exist. 
   2. 32 (R/W) - 32B (R/W): Continuity should exist. 
3. Check continuity between driver seat control unit connector B143 terminals 21 (Y/B), 32 (R/W) and ground.
   1. 21 (Y/B) - Ground: Continuity should not exist. 
   2. 32 (R/W) - Ground: Continuity should not exist. 
   Fig 3: Checking Harness Continuity

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: Replace front lifting motor.
2. NG: Repair or replace harness between driver seat control unit and front lifting motor.