Free Automotive Repair Advice by Certified ASE Technicians
How Does it Work /
Power Door Locks
How Power Door Locks Work
Power locks or electric locks allow the doors of a vehicle to be locked or unlocked
automatically. A keyless entry remote control using a key fob can enable a user
to activate the door locks from a short range outside the vehicle. The basic system
components include: lock actuator, switches, wiring and a circuit breaker. Voltage
is sent to the actuator by using a control switch which is connected to the 12 volt
power source of the car through a circuit breaker.
Door Lock Actuator
In some cases a body controller is used in conjunction with the door lock system.
The body controller can unlock and lock doors when a correct conditions exist such
as lock the doors after 2 minutes of driving. Most actuators are normally located
below the door latch of the car or is manufactured as part of the door latch. When
the door is unlocked the actuator is supplied with power which excites an electrical
coil, electromagnetism supplies the force to actuate the door latch.
Door Lock Actuator (cutaway)
Some actuators are manufactured with a electric motor and a gear set is used to
move a control rod to activate door lock. A series of gears act as a gear reduction
to move a rack and pinion flat gear. The motor can be driven in both directions
depending on the use of the switch to lock and unlock the door latch.
How Does it Work
/ Power Door
Locks
Check Manufacturer Specific Power
Door Locks Questions and Answers
Related Subjects
Got a Car Repair Question
we will answer it for FREE!
GET A
REPAIR MANUAL
FOR YOUR CAR. Get instant access to your vehicles drive belt routing, wiring
diagrams, trouble code information and other available updates and factory bulletins. | 
