1998 Buick Century Owner's Manual - Page 36

Rear Seat Outside Passenger Positions Lap-Shoulder Belt The positions next tothe windows have lap-shoulder belts. Here's how to wear one properly. 1. Pick up the latch plate and pull the belt across you. Don't let it get twisted. The shoulderbelt may lock if you pull the belt across you very quickly. If this happens, let the belt go back slightly to unlock it. Then pull the belt across you more slowly.