2003 Buick Century Owner's Manual - Page 33

The safety belt locks if there's a sudden stop or a crash, or if you pull the belt very quickly out of the retractor. You can be seriously hurt if your shoulder belt is too loose. In a crash, you would move forward too much, which could increase injury. The shoulder belt should fit against your body. I I To unlatch the belt, just push the button on the buckle. 1-26