Caliber L4-2.0L (2008)
Air Bag: Description and Operation
Knee Blocker Airbag
Description
DESCRIPTION
The Knee Blocker Airbag is located on the driver side of the vehicle below the steering column, at the bottom edge of the instrument panel. The knee
blocker airbag contains:
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A stamped steel housing (4) with retaining hooks (1) for the knee blocker airbag trim cover to attach to.
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An airbag cushion (2)
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An igniter (3)
WARNING: Following a knee blocker airbag deployment, the knee blocker airbag and instrument panel assembly must be replaced.
Operation
OPERATION
The knee blocker airbag is equipped with a single inflator. When the Occupant Restraint Controller (ORC) sends the proper electrical signals to the
initiator, the electrical energy generates enough heat to initiate a small pyrotechnic charge which, in turn ignites chemical pellets within the inflator. Once
ignited, these chemical pellets burn rapidly and produce a large quantity of inert gas. The inflator is sealed to the back of the airbag housing and a
diffuser in the inflator directs all of the inert gas into the airbag cushion, causing the cushion to inflate. As the cushion inflates, the knee blocker airbag
trim deploy. Following an airbag deployment, the airbag cushion quickly deflates by venting the inert gas towards the instrument panel through vent
holes within the fabric used to construct the back panel of the airbag cushion.
Some of the chemicals used to create the inert gas may be considered hazardous while in their solid state before they are burned, but they are securely
sealed within the airbag inflator. Typically, the potentially hazardous chemicals are burned during an airbag deployment event.
WARNING: The inert gas that is produced when the chemicals are burned is harmless. However, a small amount of residue from the burned
chemicals may cause some temporary discomfort if it contacts the skin, eyes, or breathing passages. If skin or eye irritation is noted, rinse the
affected area with plenty of cool, clean water. If breathing passages are irritated, move to another area where there is plenty of clean, fresh air
to breath. If the irritation is not alleviated by these actions, contact a physician.
