Close Switch 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.

CLOSE SWITCH 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 terminal 14 and ground.
  
  Fig 1: Back Door Control Unit Terminal 14 And Ground Voltage Graph
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Close switch is OK.
2. NG: GO TO 2.
Fig 2: Checking Voltage Between Back Door Control Unit Connector B55 Terminal 14 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CLOSE SWITCH CIRCUIT INSPECTION
1. Disconnect back door latch and back door control unit.
2. Check continuity between back door latch (close switch) connector D503 terminal 5 and back door control unit connector B55 terminal 14.
  1. 5 (P) - 14 (P): 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 Terminal 5 And Back Door Control Unit Connector B55 Terminal 14
Courtesy of NISSAN MOTOR CO., U.S.A.
CLOSE SWITCH GROUND INSPECTION
Check continuity between back door latch (close switch) connector D503 terminal 8 and ground.
1. 8 (B) - Ground: Continuity should exist.
OK or NG
1. OK: Replace the back door latch.
2. NG: Repair or replace harness.
Fig 4: Checking Continuity Between Back Door Latch Connector D503 Terminal 8 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.