Remote Function Actuator (RFA) Module
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 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.