Cinch Latch Motor System Inspection

WARNING: This page is about a different car, the 2005 Infiniti QX56. 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 Terminals 11, 12 And Ground Voltage Graph
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Replace the back door control unit.
Fig 2: Checking Voltage Between Back Door Control Unit Connector B55 Terminals 11, 12 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
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 D503 terminals 1, 2 and back door control unit connector B55 terminals 11, 12.
  1. 1 (L) -12 (L): Continuity should exist.
  2. 2 (Y) -11 (Y): Continuity should exist.
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace harness.
Fig 3: Checking Continuity Between Back Door Latch Connector D503 Terminals 1, 2 And Back Door Control Unit Connector B55 Terminals 11 And 12
Courtesy of NISSAN MOTOR CO., U.S.A.
CINCH LATCH MOTOR OPERATION INSPECTION
Connect battery power to terminals 1 and 2 on the back door latch and check motor operation.
1. 1 (+) - 2 (-): It operates.
2. 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 And 2 On Back Door Latch
Courtesy of NISSAN MOTOR CO., U.S.A.