Child Safety Lock on Vehicle Doors
Child safety locks are built into the rear doors of most cars to prevent rear seat passengers, particularly little ones, from opening the doors both during transit and while the vehicle is stationary. Most vehicles have been built with this feature since the early 1980s.
The child lock provides the vehicle driver with a simple, safe & secure method to prevent unauthorized exit from the car. Although called a child lock it is equally effective for adult passengers.
Most child safety locks can be activated and deactivated via a small switch on the edge of the door. It is only accessible when the door is opened, as shown in the picture. Some cars implement the child lock control as a rotary mechanism which can only be operated with a key.
Once the door is closed, control of child lock is completely inaccessible to the passengers. In some newer car models, the child lock can be activated electronically from the driver position via a Door control unit (refer comment section).
When the child lock is engaged, the interior handle will only move freely without unlatching the door. The respective door is neither able to be opened by the passenger from inside nor can the passenger disables the lock.
The door can only be opened by someone lifting the outside handle, either a second person or by the passenger opening the window and reaching the outside handle.