Door Unlock Sensor Check

NOTE: Door unlock sensor is integral with door lock actuator.

Check Door Unlock Sensor Input Signal

Turn ignition off. Using DVOM, measure voltage (backprobe) between ground and terminals No. 36 (Yellow/Green wire), No. 37 (Yellow/Blue wire) or No. 26 (Yellow/Red wire) at Smart Entrance Control Unit (SECU) harness connector. See Figure . Ensure voltage is as specified. See DOOR UNLOCK SENSOR VOLTAGE SPECIFICATIONS table. If voltage is as specified, door unlock sensor is okay. If voltage is not as specified, go to next step.

DOOR UNLOCK SENSOR VOLTAGE SPECIFICATIONS

Application (Terminal No.) & Condition		Specification
Left Front Door (36)
Locked		5 Volts
Unlocked		Zero Volts
Right Front Door (37)
Locked		5 Volts
Unlocked		Zero Volts
All Other Doors (26)
Locked		5 Volts
Unlocked		Zero Volts

Check Door Unlock Sensor

Disconnect door unlock sensor harness connectors. Using DVOM, check for continuity between door unlock sensor terminals. See Fig 1 . Continuity should be present only when sensor is in UNLOCKED position. If continuity is not as specified, replace door unlock sensor. If continuity is as specified, check for open or short circuit between appropriate door unlock sensor and SECU. Check door unlock sensor ground circuit. Repair as necessary.

Fig 1: Identifying Door Lock Actuator Connector Terminals

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