Gateway Module
WARNING: This page is about a different car, the 2011 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
The Instrument Panel Cluster (IPC) is the gateway module, translating messages on the HS-CAN to the MS-CAN and vice versa. This allows a message to be distributed throughout both networks. The IPC is the only module on this vehicle that has this ability.