Instrument Cluster Gateway Function
WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster acts as a gateway module by receiving information in one format and transmitting it to other modules using another format. For example, the instrument cluster receives the vehicle speed data from the PCM over the HS-CAN, converts the data into a MS-CAN message and sends (gateways) the message to other network modules such as the electronic automatic temperature control (EATC), the tire pressure monitoring system (TPMS), the parking aid module, and the smart junction box (SJB). This enables network communication between modules that do not communicate using the same network (HS-CAN or the MS-CAN).