Cinch Latch Motor System Inspection

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CINCH LATCH MOTOR SIGNAL INSPECTION

Turn ignition switch OFF.

While fully opening and closing the back door, check voltage between back door control unit connector B55 terminals 11, 12 and ground.

TERMINALS VOLTAGE CHART

11 - Ground
12 - Ground

Fig 1: Identifying 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 : 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 D503 terminals 1, 2 and back door control unit connector B55 terminals 11, 12.
  1 - 12 : Continuity should exist.
  
  2 - 11 : Continuity should exist.
  
  Fig 2: Identifying Continuity Between Connector D503 Terminals 1, 2 And Connector B55 Terminals 11, 12
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 and check motor operation.

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

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

Fig 3: Identifying Cinch Latch Motor Operation
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : Cinch latch motor is OK.
- NG : Replace the back door latch.