Doors with a twisted tab lock are still easy to get past even if that tab is set to lock these locks appear on the handle of a door when either facing laterally or vertically the door will be locked or unlocked.
How does door lock works.
The key turns the cylinder which in turn turns something called a cam.
How door locks work.
If the door lock relay needs to be replaced it can be indicative of an underlying concern with the power door locks.
Some vehicles equipped with remote keyless entry will find the key fob operates the driver s door lock even while the door lock relay is defective.
The lock is set from inside the door.
The cam then releases a spring which shoots the tang forward securing the door to the wall.
A key is necessary to release the tang.
Once the key is removed the spring will automatically push the latch back out.
For serious lock problems it is usually best to call a locksmith or to replace the lock.