What Causes Doors to Automatically Lock?

[DeAurora]

The reason doors automatically lock is that when the vehicle speed reaches the preset value in the computer, the door lock button will be automatically pressed. This feature, also known as speed-sensing auto-locking, is designed to prevent accidental door opening. There are other methods of automatic door locking as well. For instance, when the transmission is shifted into D (Drive) gear, the lock button will automatically engage to prevent unintended door opening. Some Chevrolet and Buick models use this locking method. Another method involves the doors automatically locking when the driver applies the brakes during driving, commonly found in domestic or some low-end vehicles. A less common locking method is when the doors automatically lock after the vehicle has been in continuous motion for 10 seconds.