1998 GMC Sonoma Owner's Manual - Page 68

Door Locks There are several ways to lock and unlock your vehicle. You can use the Keyless Entry System, if you have this option. You can use your key to unlock your door from the outside. Unlocked doors can be dangerous. Passengers especially children can easily a door is open the doors and fall out. When locked, the inside handle won't open it. Outsiders caneasily enter through an unlocked door when you slow down or stop yourvehicle. This may not be obvious: You increase the so chance of being thrown out the vehicle ina of crash if the doors aren't locked. Wear safety belts properly, lock your doors, and you will be far better off whenever you drive yourvehicle. -- -- To lock your door from the inside, slide the lever on your inside door down. To unlock the door, slide the lever on your inside door up. You will see a red area on the lever. 2-4