2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 149

Power Door Locks With power door locks, the switches on the front doors can be used to lock and unlock the vehicle. This feature will not operate if the key is in the ignition. You can program this feature using the Driver Information Center (DIC). See DELAY DOOR LOCK under DIC Vehicle Customization (With DIC Buttons) on page 4‑76. " (Unlock): Press to unlock the doors. Q (Lock): Remove the key from the ignition and press to lock the doors. Delayed Locking The vehicle may have the delayed locking feature. When locking the doors with the power lock switch and a door is open, the doors will lock five seconds after the last door is closed. You will hear three chimes to signal that the delayed locking feature is in use. Pressing the power lock switch twice will override the delayed locking feature and immediately lock all the doors. Programmable Automatic Door Locks Vehicles with an automatic lock/unlock feature enable you to program the vehicle's power door locks. You can program this feature through the Driver Information Center (DIC). See DIC Vehicle Customization (With DIC Buttons) on page 4‑76 for more information on DIC programming. 3-11