Chevrolet 1993 Astro Passenger Owner's Manual page 33

Shoulder Belt Height Adjuster
You can move the shoulder belt adjuster to the height that is right for you.
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To move it down, push in the adjuster at the arrows and pull down on the
adjuster. After you move the adjuster to where you want
it,
try to move it up
and down to make sure it is locked into place.
You can move the adjuster up from a lower position just by pushing up on it.
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Adjust the height so that the shoulder portion of the belt is centered on your
shoulder. The belt should be away from your face and neck but not falling off
your shoulder.
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