Chevrolet TRACKER 2002 Owner's Manual page 25

Shoulder Belt Height Adjuster
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you.
1-18
To move it down, pull out the knob and move the
height adjuster to the desired position. You can move
the adjuster up just by pulling out the knob and sliding
the adjuster up. After you move the adjuster to where
you want it, try to move it down without pulling out the
knob 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.