The doors will lock automatically when all doors are closed, the ignition is on, and the vehicle is shifted out of P (Park).
If a vehicle door is unlocked and then opened and closed, the doors will lock either when your foot is removed from the brake or the vehicle speed becomes faster than 13 km/h (8 mph).
To unlock the doors:
on the power
door lock
switch.Automatic door locking cannot be disabled. Automatic door unlocking can be programmed. See Vehicle Personalization.
Delayed Locking
Lockout Protection#01-08-51-003D: Application of Anti-Corrosion Materials - (Sep 16, 2013)
Subject:Application of Anti-Corrosion MaterialsModels: 2014 and Prior GM Cars and Trucks This bulletin has been revised to add the 2013-2014 model years and update the product/suppliertables. Please discard Corporate Bulletin Number♦01-08-51-003C.After a collision, some vehicle structure areas ...