Cadillac 2002 DeVille 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.
To move it down, press down on the power seat recliner
control and move the height adjuster to the desired
position. You can move the adjuster up just by pushing
up on the power seat recliner control. After you move
the adjuster to where you want it, try to move it down
without pushing the power seat recliner control 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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