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FRONT IMPACT
SENSOR
The front impact sensor is installed on the front
end upper bar in the engine room, and the
analogue G-sensor is housed in the front
impact sensor.
The front impact sensor transmits the coded
acceleration data to SRS-ECU. Based on the
data, SRS-ECU determines the deployment
stage of the front air bag, then energises
appropriate squib.
SRS-ECU performs the diagnostics of the front
impact sensor internal components. If a
malfunction occurs, it sets the diagnosis code.
SEAT BELT
PRE-TENSIONER
The seat belt with pre-tensioner consists of
seat belt, gas generator, etc. and automatically
winds the seat belt at the time of a frontal
collision to reduce the forward movement of
the passenger.
SRS-ECU In addition to the analogue G-sensor and
safing G-sensor for the frontal collision, the
SRS-ECU incorporates the analogue G-sensor
and safing G-sensor for the side collision. In
the event of a frontal collision, when the front
impact sensor in the engine room and the
analogue G-sensor for the frontal collision in
the SRS-ECU detect the collision G at the
same time, the SRS-ECU applies electrical
current to the driver's seat/front passenger's
seat air bag module and the front seat belt pre-
tensioner (squib).
Front impact sensor
Front end upper bar
SRS-ECU
Seat belt pre-tensioner
Gas generato
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