Seat Reclining Sensor Circuit Inspection

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK RECLINING SENSOR INPUT/OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Check signal between driver seat control unit connector and body ground, with oscilloscope.
  
  Fig 1: Checking Reclining Sensor Input/Output Signal (1 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Reclining Sensor Input/Output Signal (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: System is OK.
2. NG: GO TO 2.
CHECK RECLINING SENSOR MECHANISM
Check the operation malfunction caused by reclining mechanism deformation or parts are loose.

OK or NG
1. OK: GO TO 3.
2. NG: Repair the malfunctioning parts.
CHECK HARNESS CONTINUITY
1. Disconnect driver seat control unit connector and reclining motor connector.
2. Check continuity between driver seat control unit connector B143 terminals 30 (L), 32 (R/W) and reclining motor connector B147 terminals 30 (L), 32 (R/W).
  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 body ground.
  
  Fig 3: Checking Harness Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
30 (L) - Ground: Continuity should not exist.

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

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