Check Reclining Sensor Circuit

Check the operation malfunction caused by reclining 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	30 (L)	Ground	Reclining 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 reclining motor connector.
2. Check continuity between driver seat control unit connector B143 terminals 30, 32 and reclining motor connector B147 terminals 30, 32.

   30 (L) - 30 (L) : Continuity should exist. 

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

3. Check continuity between driver seat control unit connector B143 terminals 30, 32 and ground.

   30 (L) - 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 30, 32 And Ground

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

OK or NG 

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