GMC 2002 Sierra - Manual (Page 27)

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Q:
What’s wrong with this?
A:
The belt is over an armrest.
CAUTION:
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 at the
abdomen, not at the pelvic bones, and that could
cause serious or fatal injuries. Be sure the belt
goes under the armrests.