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#02-00-89-002L: Information for Dealers/Technicians on When and How to Submit a Field Product Report (FPR) (U.S. Dealers Only) - (Oct 24, 2013)
Subject:Information for Dealers/Technicians on When and How to Submit a Field Product Report(FPR) (U.S. Dealers Only)Models: 2014 and Prior GM Cars and TrucksAttention: Canadian dealers should refer to the latest version of Corporate Bulletin Number 10-00-89-006.This bulletin has been revised to a ...