Remote Function Actuator (RFA) Module
WARNING: This page is about a different car, the 2014 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The RFA module interprets radio frequency signals from the TPM module and IA key transmitters. The RFA module receives input signals from various modules and other components. Based on this information, the RFA module generates an output signal to control various components (door locks, liftgate, etc.).