Check Front Lifting Sensor Circuit

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

OK or NG 

• OK : GO TO 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.
   CONNECTORS VOLTAGE REFERENCE
   
   

   Connector	Terminals (Wire color)		Condition	Signal (Reference value)
   	(+)	(-)
   B143	21 (Y/B)	Ground	Front lifting motor operation

   Fig 1: Identifying Signal Between Driver Seat Control Unit Connector And Ground

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

OK or NG 

• OK : System is OK.
• 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, 32 and front lifting motor connector B148 terminals 21, 32B.

   21 (Y/B) - 21 (Y/B) : Continuity should exist. 

   32 (R/W) - 32B (R/W) : Continuity should exist. 

3. Check continuity between driver seat control unit connector B143 terminals 21, 32 and ground.

   21 (Y/B) - Ground : Continuity should not exist. 

   32 (R/W) - Ground : Continuity should not exist. 

   Fig 2: Identifying Continuity Between Driver Seat Control Unit Connector B143 Terminals 21, 32 And Ground

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

OK or NG 

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