Remote Function Actuator(RFA) Module
WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The Remote Function Actuator(RFA) is responsible for verifying a valid programmed passive key is detected before allowing the ignition to transition out of OFF. When the Remote Function Actuator(RFA) module is replaced, at least 2 keys must be programmed to it and the parameter reset procedure carried out.