Cinch Latch Motor System Inspection

WARNING: This page is about a different car, the 2004 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 between back door control unit connector B55 terminals 11, 12 and ground.
Fig 1: Back Door Control Unit Connector B55 Terminals 11, 12 & Ground Waveform
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage Pattern Between Back Door Control Unit Connector B55 Terminals 11, 12 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: Replace the back door control unit.
CINCH LATCH MOTOR CIRCUIT INSPECTION
1. Disconnect back door latch and back door control unit connector.
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.
  1 (L/W) - 12 (L/W): Continuity should exist.
  
  2 (L/B) - 11 (L/B): Continuity should exist.
Fig 3: Checking Continuity Between Back Door Latch & Back Door Control Unit Connector Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 3.
2. NG: Repair the harness between the back door latch (cinch latch motor) and the back door control unit.
CINCH LATCH MOTOR OPERATION INSPECTION
Connect battery power to terminals 1 and 2 on the back door latch connector and check motor operation.

1 (+) - 2 (-): It operates.

1 (-) - 2 (+): It operates. (Reverse rotation)

OK or NG
1. OK: Motor is OK.
2. NG: Replace the back door latch.
Fig 4: Connecting Battery Power To Terminals 1 & 2 On The Back Door Latch Connector
Courtesy of NISSAN MOTOR CO., U.S.A.