Check Open Switch

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPEN SWITCH SIGNAL

Turn ignition switch OFF.

Check the signal between back door closure control unit connector and ground with oscilloscope.

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

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

OPEN SWITCH SIGNAL

Connector	Terminals (Wire color)		Back door condition	Signal (Reference value)
Connector	(+)	(-)	Back door condition	Signal (Reference value)
D106	9 (P)	Ground	Fully open → fully closed	Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Open switch is OK.

NG: GO TO 2.

CHECK HARNESS CONTINUITY
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 GROUND CIRCUIT
Check continuity between back door closure motor connector D109 terminal 8 and ground.

8 (B) - Ground : Continuity should exist.

Fig 3: Identifying Continuity Between Back Door Closure Motor Connector D109 Terminal 8 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair or replace harness.
CHECK BACK DOOR CLOSURE CONTROL UNIT OUTPUT SIGNAL
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.