Buick 2007 LaCrosse - Manual (Page 64)

5. Pull the rest of the shoulder belt all the way
out of the retractor to set the lock.
6. To tighten the belt, push down on the child
restraint, pull the shoulder portion of the belt to
tighten the lap portion of the belt, and feed the
shoulder belt back into the retractor. If you are
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. You
should not be able to pull more of the belt from
the retractor once the lock has been set.
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