TPM 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 TPM module has a dedicated power and ground. It communicates all passive key and RKE information to the RFA module through a LIN -based circuit. The TPM module is a receiving antenna that receives the high frequency signals from a passive key. It also receives the signals from a RKE command.