The door on a car should be safe, light and should ensure when closes and becomes part of the whole structure. The locking system is one of the components that should take care of the customer safety and is always in contact with the customer, this is why it is created with a door locking mechanism with less effort, at a reduce cost and easier assembly for the car. Car door latch mechanism is
. simpler, let us check with the power door on a car. In this car, the power-door-lock actuator is positioned below the latch. 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. when the actuator moves the latch up, it connects the outside door handle to the opening mechanism. When the latch is down, the outside door handle is disconnected from the mechanism so that it cannot be opened. To unlock the door, the body controller supplies power to the door-lock actuator for a timed interval. The power-door-lock actuator works as a simple system. A small electric motor turns a series of spur gears that serves as a gear reduction. The last gear drives a rack-and pinion gear-set that is connected to the actuator rod. The rack converts the rotational motion of the motor into the linear motion needed to move the lock. You can find more information here: http://auto.howstuffworks.com/power-door-lock.htm
