GMC SIERRA 2002 Manual page 75

5. Pull the rest of the shoulder belt all the way out of
the retractor to set the lock.
1-68
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
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.
-
facing