Chevrolet 2005 Uplander Owner's Manual page 76

CAUTION:
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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.
1-70
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.