It s a simple mechanism you can have a closer look on its working by watching this short video it will.
Car door lock mechanism.
Locate the latch on your car door.
Hold the lock button down while you slowly open and close the door.
Find the hole or gap that is meant to catch on the hasp of the car door.
The latch or bolt is the part that extends into the strike anchoring the door to the door frame.
In this car the power door lock actuator is positioned below the latch.
If the lock tries to move then it is a frozen lock mechanism.
For example a door lock contains a mechanism to operate a latch or bolt.
Step 4 move door back and forth.
When the actuator moves the latch up it connects the outside door handle to the opening mechanism.
Try these tips for a quick way to repair car door lock.
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.
Insert a key pen or other thin and long tool into.
When the bolt is retracted back out of the strike the door is free to open figure 1.
A rod con nects the actuator to the latch and another rod connects the latch to the knob that sticks up out of the top of the door.
When the bolt is thrown it moves into the strike and locks the door.
If the lock works then you have a broken or frayed wire that needs to be changed or repaired.
How a car door lock works is explained in this video.