BACK DOOR: Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - WITHOUT INTELLIGENT KEY SYSTEM ".

BACK DOOR POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect back door control unit connector.
3. Check voltage between back door control unit connector B55 terminals 3, 10 and ground.
  3 - Ground: Approx. battery voltage
  
  10 - Ground: Approx. battery voltage
  
  Fig 1: Checking Door Power Supply Circuit Voltage
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Is the inspection result normal?
  
  YES: GO TO 2
  
  NO: Repair the back door control unit power supply circuit.
BACK DOOR GROUND CIRCUIT INSPECTION
Check continuity between back door control unit connector B55 terminal 1, 2 and ground.

1 - Ground: Continuity should exist.

2 - Ground: Continuity should exist.

Fig 2: Checking Ground Circuit Continuity
Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES: Circuit is OK.

NO: Repair the harness between the back door control unit and ground.