Chevrolet 2006 HHR Owner's Manual page 56

4. Pull the rest of the shoulder belt all the way out of
the retractor to set the lock.
1-50
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. 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.
6. If your child restraint manufacturer recommends
using a top tether, attach and tighten the top
tether to the top tether anchor. Refer to the
instructions that came with the child restraint and
see Lower Anchors and Tethers for Children
(LATCH) on page 1-43.
7. Push and pull the child restraint in different
directions to be sure it is secure.