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48
The system components are designed to
work together to help provide the
occupant with the most appropriate
protection level, based on crash severity
and front passenger classification:
- The Occupant Classification System will
attempt, based on the weight resting on
the seat, to classify the front passenger
either as a child (see also page 50 for
more details about the Occupant
Classification System), for which airbag
deployment is not appropriate, as it can
result in serious injuries and death, or
an adult (see also page 50 for more
details about the Occupant Classification
System), for which deployment is
appropriate depending on the crash
severity.
The classification system will then
transmit the occupant classification to
the control unit, that will use the
information to enable or disable
passenger airbag deployment (see also
page 50 for more details about the
Occupant Classification System).
- In the event of certain frontal crashes,
the electronic control unit will use the
signal from the remote acceleration
sensors, from the Occupant
Classification System and from the seat
belt sensor to supplement its internal
sensing capabilities. The control unit is
designed to use this signal to determine
whether airbag deployment and
pretensioner activation are required.
- For frontal crashes, based on the angle
and severity of the crash and on the
front passenger classification, the airbag
control unit is designed to determine
whether to or not to:
• deploy the airbags
• deploy the airbags in low energy mode
• deploy the airbags in high energy mode.
- For low severity crashes, the airbag
control unit will not deploy the airbags.
- For crashes of higher severity, the
control unit will deploy the driver airbag
in low energy mode and will use the
signal from the Occupant Classification
System to determine whether to deploy
the passenger airbag in low energy
mode or not to deploy the airbag (if the
front passenger is classified as child it
will not deploy the airbag. If the front
passenger is classified as adult it will
deploy the airbag) (see also page 50 for
more details about the Occupant
Classification System).
- For crashes of even higher severity, the
control unit will deploy the driver airbag
in high energy mode and will use the
signal from the Occupant Classification
System to determine whether to deploy
the passenger airbag in high energy
mode or not to deploy the airbag (if the
front passenger is classified as child it
will not deploy the airbag. If the front
passenger is classified as “adult” it will
deploy the airbag).
If the airbags are deployed, the seat
belt pretensioner will also be activated
for every seating position where the
seat belt is fastened.
The airbag control unit will use the
seat belt status indicated by the seat
belt status sensor in order not to
activate the seat belt pretensioner for
the seating position where the seat belt
is not fastened.
The control unit is also designed to
perform a check of all the electrical
components in the system (including a
self check) upon ignition and periodically
thereafter, until the engine is turned off.
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