Chevrolet 2003 Impala Owner's Manual page 54

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4. Pull the rest of the shoulder belt all the way out of
the retractor to set the lock.
5.
6.
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
push down on the child restraint as you tighten
the belt.
Push and pull the child restraint in different
directions to be sure it is secure.
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