1999 Chevrolet Cavalier Owner's Manual - Page 68
1999 Chevrolet Cavalier Manual
Page 68 highlights
yellowblue Door Locks CAUTION: Unlocked doors can be dangerous. Passengers -- especially children -- can easily open the doors and fall out. When a door is locked, the inside handle won't open it. Outsiders can easily enter through an unlocked door when you slow down or stop your vehicle. This may not be so obvious: You increase the chance of being thrown out of the vehicle in a crash if the doors aren't locked. Wear safety belts properly, lock your doors, and you will be far better off whenever you drive your vehicle. There are several ways to lock and unlock your vehicle. Use your key to unlock your vehicle from the outside. You can also use the optional remote keyless entry system to unlock your vehicle. See "Remote Keyless Entry System" in the Index. To lock the door from the inside, push the locking lever forward. To unlock the door, pull the locking lever backward. 2-4