Remote Function Actuator (RFA)
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 is responsible for obtaining the Intelligent Access (IA) key data. It uses the passive start antennas and the TPM module to receive the Intelligent Access (IA) key data. The RFA module receives direct input from the TPM module over a dedicated single wire network and is hardwired to the passive start antennas. The RFA module communicates the Intelligent Access (IA) key data with the BCM over the MS-CAN .
The Intelligent Access (IA) keys are programmed to the RFA module, and the RFA module contains a unique ID that is checked by the BCM .
If the RFA module is replaced, at least two keys must be programmed to it and a parameter reset with the BCM must be performed to enable PATS .