GMC 2002 Yukon XL Owner's Manual page 37

Q:
What's wrong with this?
A:
The shoulder belt is too loose. It won't give nearly
as much protection this way.
1-30
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.