1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 76

yellowblue To open the rear access door from the inside, the passenger's side front door must be opened first. Then, use the handle located on the inside of the rear access door to open it. 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. 2-4