Description and Operation — Communication Network — Overview

Overview

Multiplexing is a method of sending 2 or more signals simultaneously over one circuit. Multiplexing allows 2 or more electronic modules (nodes) to communicate over a twisted pair [data (+) and data (-)]. The information or messages transmitted over these wires consist of commands, status or data. Multiplexing reduces vehicle weight by reducing the number of redundant components and electrical wiring.

The vehicle has 2 modular communication networks connected to the DLC, located under the instrument panel. The communication networks are:

• DIAGRAM 1
• DIAGRAM 2

The vehicle has 4 or 5 (optional) communication networks that do not communicate directly with the diagnostic scan tool. The GWM translates messages on these 4 or 5 (optional) networks and transmits signals to the DIAG 1 and DIAG 2 circuits at the DLC. Messages transmitted on HS-CAN1 are translated to the DIAG 1 connection; all other networks are translated to the DIAG 2 connection at the DLC. The communication networks are:

• HS-CAN1
• HS-CAN2
• HS-CAN3
• HS-CAN4 (optional)
• MS-CAN