2003 GMC Sierra 1500 Pickup Owner's Manual - Page 97

Delayed Locking If your vehicle is a Crew Cab, it may be equipped with this feature. When you lock the doors using the power lock switch or the remote keyless entry transmitter with any door open three chimes will signal that delayed locking is being used. Programmable Automatic Door Locks If your vehicle has power door locks, it is equipped with a feature that enables you to program the door locks. Your vehicle left the factory programmed to automatically lock all doors when the vehicle is out of PARK (P), and all doors unlock when the vehicle is in PARK (P). You can set the automatic door lock feature to unlock the doors you select once the vehicle is in PARK (P). If your vehicle has a manual transmission it left the factory programmed to lock all doors when the vehicle speed is greater than 8 mph (12 km/h) for two seconds, and unlock all doors once the key is removed from the ignition. You can set the automatic door lock feature to unlock the doors you select once the key removed is from the ignition. The following instructions detail how to program your door locks. Five seconds after the last door is closed, all the doors will lock. All doors can be re-opened for up to five seconds from the time the last door is closed. You can lock the door immediately using the power door lock switch or the optional remote keyless entry transmitter a second time. This feature will not lock the doors if the key is in the ignition. To enable or disable the delayed locking feature, do the following: 1. Press and hold the power door lock switch on the driver's door in the lock position. 2. Press the remote keyless entry transmitter unlock button twice. If the feature is disabled, the doors will lock immediately when a power door lock switch or remote keyless entry transmitter button is pressed. 2-10