Power door locks are prone to failures due to electrical interruptions corrosion broken wires or blown fuses.
Power door lock switch fuse.
To unlock the doors the switch reverses the polarity of the voltage applied to the solenoid.
Determine from the chart or the diagram on the fuse box lid which fuse or fuses control that device.
Check those fuses first but check all the fuses before deciding that a blown fuse is the cause.
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You should see the voltage polarity toggle with each switch activation.
Then use your test light or digital meter to check for power and ground at the connector when you operate the lock unlock switch.
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The door lock relay is the relay responsible for sending power to the door lock actuators so that they can lock and unlock the vehicle.
Turn the ignition switch to lock 0.
Door lock systems operate the actuator by toggling positive negative voltage to the actuator.
Replace any blown fuses and check if the device works.
When the relay fails or has issues it can cause problems with the operation of the door locks.
Unplug the door lock actuator electrical connector.
The door lock relay is the relay responsible for sending power to the door lock actuators so that they can lock and unlock the vehicle.
Order power door lock relay for your vehicle and pick it up in store make your purchase find a store near you and get directions.
An inoperative power door lock can be caused by the switch solenoid wiring problem or mechanical problem within the linkage of the affected door.
To lock the doors the switch provides voltage to the two terminals of the solenoid.
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When the relay fails or has issues it can cause problems.
Diagnosis if all of the door locks are inoperative start your diagnosis at the fuse box.
A fuse is a low resistance resistor that creates overcurrent protection.
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Find out why a lack of any movement in door locks is most likely a result of a blown.