Side Air Curtain
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The side air curtain is a single-stage airbag which is designed to protect the vehicle occupant(s) during certain side impact or rollover crashes. It deploys upon receipt of electrical current, in conjunction with the side airbag.