Chevrolet 1998 Lumina Owner's Manual page 55

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CAUTION:
An unfastened shoulder harness clip won't help
keep the harness in place on the child's shoulders.
If the harness isn't on the child's shoulders, it
won't be able to restrain the child's upper body
in a sudden stop or crash. The child could be
seriously injured. Make sure the harness clip is
properly fastened.
9. On both sides of the harness, pull up on the lap part
a little to be sure it's locked.
If the harness isn't locked, or if it becomes too tight,
unfasten the harness clip. Then unlatch the harness
by pushing the button on the buckle, and let both
sides of the harness go all the way back so they will
move freely again. Then, repeat Steps 4 through 8.
If the harness still doesn't lock, don't use the child
restraint. See your dealer to have the built-in child
restraint serviced.
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