Cinch Latch Motor System 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: Checking Continuity Between Back Door Latch Connector (B) Terminals 1, 2 And Back Door Control Unit Connector (A) Terminals 11, 12, And Between Connector (B) 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.

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.

1. Reconnect back door latch and back door control unit.
2. 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
   
   

   Terminals		Measuring condition	Voltage (V) (Approx.)
   ( + )	( - )
   11 12	Ground	While closing back door	Battery voltage
   		While opening back door

OK or NG 

OK: Cinch latch motor circuit is OK.

NG: Replace the back door control unit.

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

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