Geo 1995 Prizm Owner's Manual page 21

Shoulder Belt Height Adjuster
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you.
Pull the release knob and move the height adjuster to the
desired position. When you release the knob, try to
move the adjuster down to make sure it has locked into
position.
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.
1-13