Chevrolet Tracker 2003 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.
To move it down, pull 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.
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