Communications Network: Notes

WARNING: This page is about a different car, the 2013 Lincoln MKX and 2013 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Multiplexing allows 2 or more electronic modules (nodes) to communicate simultaneously over a twisted wire pair [data (+) and data (-)] network. The information or messages that can be communicated on these wires consists of commands, status or data. The advantage of using multiplexing is to reduce the weight of the vehicle by reducing the number of redundant components and electrical wiring.

The vehicle has 2 module communication networks connected to the Data Link Connector (DLC) and communicate with the scan tool. The communication networks are:

High Speed Controller Area Network (HS-CAN)
Medium Speed Controller Area Network (MS-CAN)

The Infotainment Controller Area Network (I-CAN) is connected to the DLC, but the I-CAN modules communicate with the scan tool over the HS-CAN. The Instrument Panel Cluster (IPC) is used as a gateway module for the messages to transfer between the scan tool and the modules on the I-CAN.