GMC TopKick 2007 Owner's Manual page 67

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.
7. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, just unbuckle the
vehicle's safety belt and let it go back all the way.
The safety belt will move freely again and be ready
to work for an adult or larger child passenger.
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