Chevrolet HHR 2011 Owner's Manual page 85

4. Pull the shoulder belt all the way out of the
retractor to set the lock. When the retractor lock is
set, the belt can be tightened but not pulled out of
the retractor.
5. 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. When
installing a forward-facing child restraint, it may be
helpful to use your knee to push down on the child
restraint as you tighten the belt.
Try to pull the belt out of the retractor to make sure
the retractor is locked. If the retractor is not locked,
repeat Steps 4 and 5.
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