The functioning of a single lock occurs due to the operation of bidirectional electromagnets located in the car doors. The control switch has two positions: LOCKED and OPEN. When pressed, the switch supplies power to the door lock actuator control relay, resulting in the corresponding switching of the latter. Depending on the initial position, the relay outputs a voltage of the corresponding polarity to the electromagnets of the activators.
On some models, the single lock system is equipped with a remote control and integrated with the anti-theft system. The functioning of such a system is controlled by a special electronic control module. If the cause of the system failure cannot be identified during the checks described below, seek advice from Nissan Genuine Service Stations.
Always check the condition of the circuit protection provided by the combination of fuses and circuit breakers first.
Toggle the control switches in both directions with the engine off. Listen for clicks as the electromagnets in the door activators actuate.
If there are no clicks, check the power supply to the switches. If the power supply is interrupted, check the condition of the wiring in the section of the circuit between the corresponding switch and the fuse mounting block.
If power is supplied properly, check the condition of the switch (conductivity distribution). Replace defective components.
If the switch is OK, but the relay does not click, check the condition of the wiring between the appropriate switch and the relay. Make necessary repairs.
If the relay is energized properly, but does not supply power to the door activator, check the grounding of its case. If the ground is OK, replace the relay.
If only one of the activators fails, remove the interior upholstery panel from the corresponding car door (see chapter Body) and check the correctness of the voltage supply to the executive electromagnet by switching the control switch. One of the wires must be powered in one of the switch positions, the second in the other.
Replace solenoid if voltage is correct.
If there is a power failure, check for an open or short in the wiring between the solenoid and the relay.
Note. Most often, a wire break occurs in the area between the door and the body panel.