How a car door lock works is explained in this video.
Central car door lock mechanism diagram.
Power door locks were introduced on the luxury scripps booth in 1914 but were not common on luxury cars until packard reintroduced them in 1956.
Power door locks also known as electric door locks or central locking allow the driver or front passenger to simultaneously lock or unlock all the doors of an automobile or truck by pressing a button or flipping a switch.
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The issue tends to start out intermittent and then worsen with time.
Sometimes a door s lock actuator might fail.
When you hit the central locking button on the remote the affected door often won t lock or won t unlock if it was already locked.
By making a circuit that simply reverses the polarity of the motor the door can be either locked or unlocked.
However vehicles without door lock cylinders will not be able to lock or unlock the doors until power is restored.
Also make sure that actuator is moving parallel to door lock.
In some cars the door lock actuator is positioned below the latch.
The central locking door lock mechanisms on saab 9 3s and 9 5s are known to occasionally stop working properly.
Remove door panels carefully 2.
It is possible to strip the unit down to repair it however it s not without.
This is done by inserting the key into the lock barrel on one door or using the remote control part of the key.
Newer cars will usually be fitted with central locking as standard.
Make sure that actuator will not block other moving parts inside of door screen and its mechanism.
Central locking system installation manual actuators installation 1.
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.
What the central locking does is open all the doors at the same time.
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If there is no key lock in the door these sensors are superfluous and a 2 wire motor can be used.
For vehicles equipped with door lock cylinders the door can still be opened using the key.
Install actuator in correct direction as shown in figures 1 a 1 b and figure 2.
Get an instant quote for your central locking issue.
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The polarity of the motor determines whether the locking mechanism goes up or down.