Cinch Latch Motor System Inspection

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CINCH LATCH MOTOR SIGNAL INSPECTION
1. Turn ignition switch OFF.
2. While fully opening and closing the back door, check voltage waveform between back door control unit connector B55 terminals 11, 12 and ground using an oscilloscope.
  
  Fig 1: Voltage Waveform Graph Description Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Waveform Between Back Door Control Unit Connector B55 Terminals 11, 12 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 2.
- NG: Replace the back door control unit.
CINCH LATCH MOTOR CIRCUIT INSPECTION
1. Disconnect back door latch and back door control unit.
2. Check continuity between back door latch (cinch latch motor) connector D511 terminals 1, 2 and back door control unit connector B55 terminals 11, 12.
  
  Fig 3: Checking Continuity Between Back Door Latch Connector D511 Terminals 1, 2 & Back Door Control Unit Connector B55 Terminals 11, 12
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - 1 (L/W) -12 (L/W): Continuity should exist.
  - 2 (L/B) -11 (L/B): Continuity should exist.
OK or NG
- OK: GO TO 3.
- NG: Repair or replace harness.
CINCH LATCH MOTOR OPERATION INSPECTION
Connect battery power to terminals 1 and 2 on the back door latch connector and check motor operation.

Fig 4: Checking Cinch Latch Motor Operation
Courtesy of NISSAN MOTOR CO., U.S.A.
- 1 (+) - 2 (-): It operates.
- 1 (-) - 2 (+): It operates. (Reverse rotation)
OK or NG
- OK: Motor is OK.
- NG: Replace the back door latch.