Cadillac 2005 STS - Manual (Page 25)

To unlatch the belt, just push the button on the buckle.
The tension reducer will release and the belt should
go back out of the way.
Before you close the door, be sure the belt is out of the
way. If you slam the door on it, you can damage
both the belt and your vehicle.
Shoulder Belt Height Adjustment
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you.
To move it down, push the
release button (A) 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
pushing the release button
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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