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 ProtectionAdhesives, Fluids, Lubricants, and Sealers Engine Control
Adhesives, Fluids, Lubricants, and SealersApplicationType of MaterialGM Part NumberAnti-Seize CompoundLubricantGM-P/N-88862477 (Canadian-P/N-88862478)Camshaft Gear Access Hole PlugSealantGM-P/N-12346004 (Canadian-P/N-10953480)Coolant Temperature Sensor ThreadsSealantGM-P/N-12346004 (Canadian-P/N-109 ...