2016-20. 2016-23. 35929. ELECTRICAL COMPONENTS. Object sensor. Rear. A sensor (usually radar based) that detects if an object is in a vehicle's blind spot area. A sensor that detects motion like a footsweep, then signals a module which then commands the liftgate to open. Blind Spot Detection System Warning. Blind spot radar. CONTROL MODULE. Liftgate Motion. Object.