Buick 2001 Century - Manual (Page 66)

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D If your vehicle has the child restraint locking
feature on the shoulder belt retractor, pull the rest
of the shoulder belt all the way out of the retractor
to set the lock.
To tighten the belt, feed the shoulder belt back
into the retractor while you push down on the
child restraint. You may find it helpful to use
your knee to push down on the child restraint as
you tighten the belt.
D If your vehicle doesn’t have the child restraint
locking feature on the shoulder belt retractor,
tighten the belt by pulling up on the shoulder
belt while you push down on the child restraint.
You may find it helpful to use your knee to
push down on the child restraint as you tighten
the belt.
6. Push and pull the child restraint in different directions
to be sure it is secure.