Chevrolet 2010 Avalanche Owner's Manual page 59

Q: What is wrong with this?
A: The belt is over an armrest.
WARNING:
You can be seriously injured if your belt goes over
an armrest like this. The belt would be much too
high. In a crash, you can slide under the belt.
The belt force would then be applied on the
abdomen, not on the pelvic bones, and that could
cause serious or fatal injuries. Be sure the belt
goes under the armrests.
I n f o r ma t i o n P r o v i d e d b y : 2-25