Cadillac 2001 Catera Owner's Manual page 49

The safety belt locks if there's a sudden stop or a crash,
or if you pull the belt very quickly out of the retractor.
Each position next to the windows has a shoulder belt
height adjuster. Move the shoulder belt adjuster to the
height that is right for you.
To move it down, press the arrow symbol and move the
height adjuster to the desired position. You can move
the height adjuster up just by pushing up on the bottom
of the height adjuster. After you move the adjuster to
where you want it, try to move it down without pushing
in 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.
CAUTION:
You can be seriously hurt if your shoulder belt is
too loose. In a crash, you would move forward
too much, which could increase injury. The
shoulder belt should fit against your body.
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