2001 GMC Sonoma Owner's Manual - Page 79

There are several ways to lock and unlock your vehicle. You can use the keyless entry system, if you have this feature. You can also use your key to unlock your door from the outside. To lock your door from the inside, slide the lever on the inside of the door down. To unlock the door, slide the lever on the inside of the door up. You will see a red area on the lever. Power Door Locks (If Equipped) You can also use the power door lock switch (if equipped). If your vehicle has power door locks, the switch is located on the armrest. Remove the ignition key and press LOCK to lock all the doors at once. To unlock the doors, press the raised area next to the key symbol. 2-8