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System Operation
AIR BAGS, SEAT BELT PRE-TENSIONERS AND LAP PRE-TENSIONER
SRS-ECU uses data of the front impact sensor (in engine compartment) and G-sensor (in SRS-ECU) to calculate
collision severity during frontal collision. SRS-ECU judges necessity of air bag based on the calculated collision
severity. In addition, the SRS-ECU also judges the operation of seat belt pre-tensioners after calculating collision
severity.
System Construction
DRIVER'S AIR
BAG MODULE
The air bag module is equipped with an inflator
that does not contain sodium azide.
The air bag is made of nylon and is inflated by
the gas from the inflator. Then, as the air bag
contacts the passenger, the gas is discharged
through two openings of backside of air bag,
thus deflating the air bag to reduce the impact
on the passenger.
PASSENGER'S
(FRONT) AIR BAG
MODULE
The passenger’s (front) air bag module
consists of an air bag, and their fasteners.
The air bag is made from nylon and inflates by
the gas from the inflator. As a passenger is
being pressed to the air bag, it deflates,
discharging gas from two vents at the side of
the air bag to reduce the shock from the
impact.
For the inflator, the gas which is harmless to
the human body has been used.
SRS-ECU
Frontal collision against
another vehicle
O
Frontal collision against a
Solid surface
Shock
above
a
certain
level
Ignition judgement
G-sensor
Front impact senso
Ignition
signal
Driver’s and front passenger’s air bags
and seat belt pre-tensioners
Inflator
Squib
connector
Passenger’s (front)
air bag module
Inflator
Squib
connector
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