Freelander System Description and Operation
RESTRAINT SYSTEMS
DESCRIPTION AND OPERATION
75-7
Airbag Modules
During a frontal collision each airbag module deploys a gas filled bag to form a protective cushion between the front
seat occupant and the steering wheel or fascia/windshield. The driver's airbag module is attached to the centre of the
steering wheel. The passenger's airbag module is installed in the fascia, above the glovebox.
Each airbag module has a gas generator attached to a folded airbag installed in a housing. The driver's airbag has
an inflated volume of 60 litres (2.12 ft
3
); the passenger's airbag has an inflated volume of 150 litres (5.30 ft
3
). The gas
generator of the driver's airbag module is filled with a nitrocellulose based material; the gas generator of the
passenger's airbag module is filled with a sodium azide based material.
The outlet of the gas generators incorporates a filter screen to prevent solid combustion by-products entering the
airbag during deployment. An igniter (squib) in each generator provides an ignition source when triggered by a fire
signal from the airbag DCU. A 2 pin connector provides the interface between the igniter and the vehicle wiring.
On the driver's airbag module, the housing is closed by a cover that forms the steering wheel centre pad; split lines
are formed in the inner surface of the cover to direct the airbag through the required exit point during deployment. On
the passenger's airbag module, the housing is closed by a trim panel profiled to match the fascia; a tethered
deployment door forms an integral part of the trim panel.