Side 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 Side Impact Sensors are remote sensor that detect acceleration due to collision at their mounting locations. The primary purpose of the Side Impact Sensors is to provide an indication of a collision earlier than is possible from a central mounting location. The Side Impact Sensors send acceleration data to the central control module.