1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 77

yellowblue 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. Use only the key or the keyless entry transmitter if your vehicle is equipped with the content theft-deterrent system and the system is on. From the inside, to lock the door, slide the lever rearward. To unlock the door, slide the lever forward. Press the recessed side of the switch marked "U" to unlock all the doors at once. 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. 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 top of the switch to unlock all the doors at once. 2-5