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OPERATIONS OF AIR BAG AND PRETENSIONER
Pretensioner
The pretensioner is a de-
vice that retracts the seat
belt to tighten or loosen the
seat belt. When a collision
occurs or when brakes are
applied, the pretensioner
detects the stopping pres-
sure and tightens the belt
before the occupant is pro-
pelled forward. This holds
the occupant in the seat
more securely.
Air Bag Operation
The air bag inflates when:
• In response to a severe frontal impact, the driver's
and front passenger's air bags work together with
the seat belts to help preventing or reducing the
personal injuries.
The air bag can inflate when:
• Underbody impact from the road surface; impact
against the curb at a very high speed; dropping
impact onto the road surface with a large angle
When a strong frontal impact
occurs, seat belt pretensioners
rewind the seat belts immedi-
ately to restrain the occupants
to their seats. It helps the effec-
tive operation of the seat belts
and airbags.
The air bag does not inflate when:
• Rollover, side impact or rear impact
The air bag seldom inflates when:
• Oblique impact, rollover
• Weak impact in which the sensor is unable to detect (under
the inflation requirements)
• Impact against narrow objects such as a telegraph pole or
a tree
• The vehicle falls into a drainage or a puddle
• The front of the vehicle crashes into high impact point ve-
hicle such as a truck
• Impact on the hood by falling stones
• The air bag warning lamp is on
SEAT BELT AND AIR BAG
8-15
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