What to know about the Door Lock Relay:
Power door locks used to be a luxury feature on vehicles, but they’ve become so mainstream that nearly every vehicle is now fortified with them. The lock’s role is to make securing your vehicle, as well as passengers, simple and easy. Instead of reaching across the vehicle to lock or unlock the doors, it can be done by simply pressing a button. Pressing the button completes a circuit, enabling the lock actuator to receive power which activates the locking mechanism to the desired position. The circuit is routed through a door lock relay, which acts as a switch to direct the power to actuators on the door locks. When unlock is pressed, the door lock relay switches from a neutral position to activating a pulse of power to the unlock circuits on the actuators. When the lock button is pressed, a pulse of power is switched to the lock circuit of the actuator to lock the doors. When the relay for the door locks is not working properly or sticking, either the lock function, the unlock function, or both are inoperative.
Facts to Note:
When service is done on any electrical system, the battery should be disconnected to avoid accidental damage or injury.
If the door lock relay needs to be changed, it can be indicative of an underlying concern with the power door locks.
Some vehicles furnished with remote keyless entry will find the key fob operates the driver’s door lock even while the door lock relay is defective.
How to Fix:
Test the operation of electric door locks.
Test the fuse for that circuit.
Test the relay.
Change the defective relay.
Test for proper operation of electric door locks.
If you are experiencing problems with your power door locks, have one of your expert technicians analyze and repair the system. Relays and electrical systems can be complex, and a broken wire or door lock actuator problem can easily mimic the symptoms of a door lock relay and vice versa.
Common symptoms indicating you may need to change the Door Lock Relay:
Power door locks don’t lock when you press the button, while the unlock feature works.
Neither the lock nor unlock functions work.
Importance of this service:
Power door locks are a convenience feature on your vehicle. If the power locks aren’t working, you can use the key to unlock your door and the locks can be manually operated as well. Have the power door lock system fixed at your convenience.