1998 GMC Suburban Owner's Manual - Page 81

Your vehicle has one double-sided key for the ignition and all door locks. Door Locks I I If you ever loseyour key, your dealer will be able to assist you with obtaining a new one. 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 caneasily enter throughan unlocked door when you slow down stop your vehicle. or This may not be so obvious: You increase the chance of being thrown outof the vehicle in a crash if the doorsaren'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. From the outside, use your key. 2-3