Chevrolet 2009 Uplander Owner's Manual page 77

CAUTION:
{
A built-in child restraint harness that is not
properly adjusted can cause injury to the child in a
sudden stop or collision. A harness that is loose,
twisted, worn improperly or improperly fastened
will not be able to restrain the child's upper body.
Make sure the harness is adjusted correctly.
Fastening the clip is not a substitute for adjusting
the harness so that it is snug.
12. Pull the shoulder harness adjustment strap (A)
firmly until the harness is snugly adjusted around
the child. You should not be able to put more than
two fingers between the harness and the child's
chest. Make sure the harness and buckle strap are
not twisted.
1-73