Chevrolet Uplander Owner's Manual page 73

11. Now fasten the left and right halves of the shoulder
harness clip together. The clip can be easily pulled
apart and is designed to pull apart during a
collision.
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.
1-67