1993 Buick Park Avenue Owner's Manual - Page 30

The safety belt locks if there's a sudden stop ora crash. Shoulder Belt Height Adjuster E To move it up or down, squeeze the release handle. When you release the handle, try to move it down a little to make sure it has locked into position. You can move the shoulder belt adjuster to the height that is right for you. You can move the adjuster up from a lower position by pushing the bottom of the release handle. 28