On a vehicle with electric locks the process is a bit different.
Car door lock actuator kit.
In some cars the door lock actuator is positioned below the latch.
On manual locks the locking function operates by pushing or pulling on the door lock.
These replacement kits are built with a low friction mechanism to reduce the strain on lock knobs caused by some aftermarket actuators.
This manipulates a series of rods that slide back and forth opening and closing the locking mechanism at the door latch.
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The actuator responds to electrical signals from the alarm or keyless entry system and physically moves the vehicle s door locking rod to a locked or unlocked position.
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A rod connects the actuator to the latch and another rod connects the latch to the knob that sticks up out of the top of the door.
How a door lock actuator works.
Vaygway universal high power door lock actuator 2 pack.
These power door lock actuators can provide a power door lock to a door that has manual door lock.