Cinch Latch Motor System Inspection

WARNING: This page is about a different car, the 2006 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CINCH LATCH MOTOR CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect back door latch and back door control unit.
3. Check continuity between back door latch (cinch latch motor) connector (B) D511 terminals 1, 2 and back door control unit connector (A) B55 terminals 11, 12.
  1 - 12: Continuity should exist.
  
  2 - 11: Continuity should exist.
4. Check continuity between back door latch (cinch latch motor) connector (B) D511 terminals 1, 2 and ground.
  1 - Ground: Continuity should not exist.
  
  2 - Ground: Continuity should not exist.
  
  Fig 1: Identifying Continuity Between Back Door Latch Connector D511 Terminals 1, 2 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 2.

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.

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

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

OK or NG

OK: GO TO 3.

NG: Replace the back door latch.

Fig 2: Connecting Battery Power To Terminals 1 And 2 On Back Door Latch Connector
Courtesy of NISSAN MOTOR CO., U.S.A.

CINCH LATCH MOTOR SIGNAL INSPECTION

Reconnect back door latch and back door control unit.

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.

TERMINALS VOLTAGE REFERENCE

11 - Ground
12 - Ground

Fig 3: Identifying Voltage Waveform Between Back Door Control Unit Connector B55 Terminals 11, 12 And Ground

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

OK or NG

OK: Cinch latch motor circuit is OK.

NG: Replace the back door control unit.