Communications Network: Notes

WARNING: This page is about a different car, the 2014 Ford F-150. 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 3 module communication networks which are connected to the Data Link Connector (DLC), located under the driver side instrument panel:

High Speed Controller Area Network (HS-CAN)
Medium Speed Controller Area Network (MS-CAN)
Infotainment Controller Area Network (I-CAN) (4.2-inch and 8-inch touchscreen only)

NOTE: Vehicles with the optional 4.2-inch screen and 8-inch touchscreen audio units have an Infotainment Controller Area Network (I-CAN) that is connected to the Data Link Connector (DLC), but modules do not communicate directly with the diagnostic scan tool. The Instrument Panel Cluster (IPC) operates as the gateway for modules on the I-CAN to communicate with the diagnostic scan tool over the HS-CAN .