Front Impact Sensor (Only USA)
WARNING: This page is about a different car, the 2005 Hyundai Santa Fe. However, it is still accessible from the selected car via links, so may be relevant.
The Front Impact Sensor is a remote sensor that provides accelerometer data to the advanced restraint control module to determine if the severity of a frontal impact event warrants a single-stage or dual-stage frontal airbag deployment.