Buick 2000 Century - Manual (Page 59)

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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. If you’re using a forward
- facing
child restraint, you may find it helpful to use your
knee to push down on the child restraint as you
tighten the belt.