Check Open Switch

1. Turn ignition switch OFF.
2. Check the signal between back door closure control unit connector and ground with oscilloscope.
   CONNECTOR TERMINAL VOLTAGE REFERENCE
   
   

   Connector	Terminals (Wire color)		Back door condition	Signal (Reference value)
   	(+)	(-)
   D106	9 (P)	Ground	Fully open --> fully closed

   Fig 1: Identifying Signal Between Back Door Closure Control Unit Connector And Ground

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

OK or NG 

OK : Open switch is OK.

NG : GO TO 2.

1. Disconnect back door closure control unit and back door closure motor connector.
2. Check continuity between back door closure control unit connector D106 terminal 9 and back door closure motor connector D109 terminal 4.

   9 (P) - 4 (P) : Continuity should exist. 

3. Check continuity between back door closure control unit connector D106 terminal 9 and ground.

   9 (P) - Ground : Continuity should not exist. 

   Fig 2: Identifying Continuity Between Back Door Closure Control Unit Connector D106 Terminal 9 And Ground

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

OK or NG 

OK : GO TO 3.

NG : Repair or replace harness.

Check continuity between back door closure motor connector D109 terminal 8 and ground.

8 (B) - Ground : Continuity should exist. 

OK or NG 

OK : GO TO 4.

NG : Repair or replace harness.

Fig 3: Identifying Continuity Between Back Door Closure Motor Connector D109 Terminal 8 And Ground

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

1. Connect back door closure control unit connector.
2. Check voltage between back door closure control unit connector D106 terminal 9 and ground.

   Back door is closed 

   9 (P) - Ground : Battery voltage 

   Fig 4: Identifying Voltage Between Back Door Closure Control Unit Connector D106 Terminal 9 And Ground

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

OK or NG 

OK : Replace back door lock assembly.

NG : Replace back door closure control unit.