Pontiac 2005 Vibe - Manual (Page 30)

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:
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, just push the button on the buckle.
Safety Belt Pretensioners
Your vehicle has safety belt pretensioners. Although
you cannot see them, they are located on the retractor
part of the safety belts for the driver and right front
passenger. They help the safety belts reduce a person’s
forward movement in a moderate to severe frontal or
near frontal crash.
If the passenger sensing system detects that there is
not a passenger in the right front passenger position, the
safety belt pretensioner for that position will not
activate. See Passenger Sensing System on page 1-56.
Pretensioners work only once. If they activate in a
crash, you will need to get new ones, and probably other
new parts for your safety belt system. See Replacing
Restraint System Parts After a Crash on page 1-63.
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