How the Circuit Works: Notes

The multiplex integrated control system sends digital signals between control units through shared wires to reduce the number of wires and make harnesses lighter. A control unit converts input signals from switches and sensors to digital signals. The control unit sends the digital signals to the other control units as serial data over dedicated communication lines. When the appropriate control unit receives the digital signal, it converts the signal back to an operational command, such as operating a relay.

The multiplex integrated control system schematic shows power, grounds, and communication lines.

There are two different networks within the multiplex integrated control system. They are:

• Body Controller Area Network (B-CAN)
• Fast Controller Area Network (F-CAN)

The body controller area network (B-CAN) transmits information at 33.33 kbps, and the fast controller area network (F-CAN) transmits information at 500 kbps. Both networks share information among multiple electronic control units and work together to form the multiplex integrated control system. The gauge control module translates information from B-CAN to F-CAN and from F-CAN to B-CAN to allow the networks to share information.