Pontiac 2003 Aztek Owner's Manual page 37

The safety belt locks if there's a sudden stop or a crash,
or if you pull the belt very quickly out of the retractor.
The lap part of the belt should be worn low and snug on
the hips, just touching the thighs.
In a crash this applies force to the strong pelvic bones.
And you'd be less likely to slide under the lap belt. If
you slid under it, the belt would apply force at your
abdomen. This could cause serious or even fatal
injuries. The shoulder belt should go over the shoulder
and across the chest. These parts of the body are
best able to take belt restraining forces.
Y , , 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.
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