Pontiac 2003 Aztek Owner's Manual page 27

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.
The safety belt locks if there's a sudden stop or crash,
or if you pull the belt very quickly out of the retractor.
Shoulder Belt Height Adjuster
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you.
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To move it down, push down on the button and move
the height adjuster to the desired position.
You can move the adjuster up just by pushing up on the
shoulder belt guide. After you move the adjuster to where
you want it, try to move it down without pushing the
button down to make sure it has locked into position.
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