Turn ignition switch to LOCK position. Using a voltmeter, backprobe appropriate terminals at Smart Entrance Control Unit (SECU) harness connector with appropriate door lock in appropriate position. See DOOR UNLOCK INPUT VOLTAGE TEST table. See Figure . If voltage is not as specified, go to next step. If voltage is as specified, door unlock input signals are okay at this time.
Disconnect malfunctioning door lock actuator harness connector. Check continuity between terminals No. 2 and 4 (terminals No. 3 and 4 on rear hatch) at door lock actuator connector (component side). See Fig 1 or Fig 2 . When door is locked, continuity should not exist. When door is unlocked, continuity should exist. If continuity is not as specified, replace door lock actuator. If continuity is as specified, check door unlock sensor ground and signal circuits for opens and/or shorts and repair as necessary. See WIRING DIAGRAMS .

DOOR UNLOCK INPUT VOLTAGE TEST

Fig 1: Identifying Door Lock Actuator Connector Terminals (Front & Rear)

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

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Door Unlock Sensor Circuit Check