Buick 2003 Century Owner's Manual page 30

To make the belt shorter, pull its free end as shown
until the belt is snug.
Buckle, position and release it the same way as the
part
o f a lap-shoulder belt. If the belt isn't long
enough, see Safety Belt Extender on page 1-29.
Make sure the release button on the buckle
is
positic
so you would be able to unbuckle the safety belt
quickly if you ever had to.
med
1-23