2003 Cadillac DeVille Owner's Manual - Page 25

Q: What's wrong with this? You can be seriously injuredif you wear the shoulder belt under your arm. In a crash, your body would move too forward, which would far increase the chanceof head and neck injury. Also, the belt would apply too much force to the ribs, which aren't as strong as shoulder bones. You could also severely injure internal organs like your liver or spleen. A: The shoulder belt is worn under the arm. It should be worn over the shoulder at all times. 1-18