2004 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 101

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 be equipped with this feature. When locking the doors with the power lock switch or the keyless entry transmitter and a door or the liftgate is open, the delayed locking feature will delay locking the doors and tailgate until 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 or the lock button on the keyless entry transmitter twice will override the delayed locking feature and immediately lock all the doors. 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). To unlock the doors, refer to the instructions listed previously. The automatic locking feature can be disabled, if you prefer. See Programmable Automatic Door Locks on page 2-10 in the following text. Operating the power locks may interact with the theft-deterrent system (if equipped). See Content Theft-Deterrent on page 2-18. 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 remote keyless entry transmitter. This feature will not operate if the key is in the ignition. You can also program this feature using the DIC. See "Delayed Locking" under DIC Operation and Displays on page 3-55. 2-9