2001 GMC Sierra 1500 Pickup Owner's Manual - Page 90

There are several ways to lock and unlock your vehicle. You can use the keyless entry system (if equipped). You can also use your key. To lock the door from the inside, slide the lever rearward. To unlock the door, slide the lever forward. Power Door Locks (If Equipped) If your vehicle has this power door lock switch, press the raised side of the switch, marked "L" on either front door to lock all the doors at once. Press the recessed side of the switch marked "U" to unlock all the doors at once. 2-7