KNEE AIR BAG MODULE [TWO-STEP DEPLOYMENT CONTROL SYSTEM]
id0810b1503100
Purpose
• When the vehicle receives an impact from a frontal or frontal offset collision, the knee air bag module operates (deploys) the air bag to mediate the impact to the legs of the driver.
Function
• When the vehicle receives an impact from a frontal or frontal offset collision, the knee air bag module operates (deploys) the air bag based on the operation signal sent from the SAS control module.
Structure/Construction
• The knee air bag module is located under the driver’s lower panel.
• The knee air bag module consists of the inflator and air bag.
• The inflator consists of the initiator, gas-generating agent, charged gas, closure discs, and diffuser.
Operation
• The knee air bag module operates (deploys) the air bag by activating the internal inflator.
• The inflator operates in the following order:
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1. When an operation (deployment) signal is received from the SAS control module, the initiator ignites.
2. The ignition of the initiator causes the combustion of the gas-generating agent which generates gas (1).
3. The generated burnt gas shatters closure disc A (2).
4. The burnt gas mixes with the charged gas (3) and shatters closure disc B (4).
5. The mixed gas passes through the diffuser and is injected into the air bag.
