2007 GMC Sierra 1500 Pickup Owner's Manual - Page 122

If your vehicle has this power door lock switch, press the bottom of the switch on either front door to lock all the doors at once. Delayed Locking If your vehicle is a crew cab, it may have this feature. When locking the doors with the power lock switch or the Remote Keyless Entry (RKE) transmitter and a door is open, the doors will not lock until five seconds after the last door is closed. Three chimes will sound to signal that the delayed locking feature is in use. Pressing the power lock switch or the lock button on the RKE transmitter twice will override the delayed locking feature and immediately lock all the doors. You can turn the delayed locking feature off or back on again by doing the following: 1. Press and hold the power door lock switch in the lock position. 2. Press unlock twice on the RKE transmitter. This feature will not operate if the key is in the ignition. You can also program this feature using the DIC. See DIC Vehicle Customization on page 282. Press the top of the switch to unlock all the doors at once. The power door locks will operate at any time even when the ignition is off. The power door locks will also automatically lock when the vehicle is out of PARK (P), or for manual transmission, when the vehicle reaches 8 mph (24 km/h). Operating the power locks may interact with the theft-deterrent system, if equipped. See Content Theft-Deterrent on page 131. 122