Tire Pressure Monitor (TPM) 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 TPM module has a dedicated power and ground. It communicates all Intelligent Access (IA) and RKE information to the RFA module through a dedicated single circuit network. The TPM module is a receiving antenna that receives the high frequency signals from an Intelligent Access (IA) key. It also receives the signals from an RKE command.