Remote Function Actuator (RFA) Module
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The RFA module controls the locking and unlocking of the vehicle. The RFA module receives direct input from the keyless entry keypad, it also receives input from the TPM module over a dedicated single wire network for the RKE and Intelligent Access (IA) features.
The RFA module sends the lock/unlock status of the vehicle over the MS-CAN to the BCM . The BCM uses this information to determine the status of the perimeter alarm.