Pontiac 2006 Vibe Owner's Manual page 30

3. To make the lap part tight, pull up on the
shoulder belt.
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 pelvic bones. And you would 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.
1-24
The safety belt locks if there is a sudden stop or a crash,
or if you pull the belt very quickly out of the retractor.
CAUTION:
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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.
To unlatch the belt, push the button on the buckle.