Pontiac Vibe 2003 Owner's Manual page 23

Shoulder Belt Height Adjuster
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you. 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.
To move it down, squeeze the button and move the
height adjuster to the desired position. You can move
the adjuster up just by pushing up on the shoulder
belt guide. After you move the adjuster to where you
want it, try to move it down without squeezing the
release button to make sure it has locked into position.
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