Circuit Description

Multiplex Integrated Control System

How the Circuit Works

The multiplex integrated control system sends digital signals between control units through shared wires to reduce the number of wires in order to make harnesses lighter.

The receiving control unit converts input signals from each switch to digital signals. The control units send digital signals to one another 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 its power, grounds, and communication lines.

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

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

The body controller area network (B-CAN) and fast controller area network (F-CAN) share information between 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.

B-CAN Network

B-CAN information transmits across the communication lines at a slower speed for convenience related operations that do not require a high process speed.

The following systems are related to the B-CAN network:

- Entry Light Control System
- Exterior Lights
- Gauges and Indicators
- Horn
- Immobilizer System
- Interior Lights
- Interlock System
- Moonroof (EX, EX-L)
- Power Door Locks/keyless Entry/Security System
- Power Windows
- Reminder Systems
- Safety Indicator
- Wiper/washer

F-CAN Network

F-CAN information transmits across the communication lines at a taster speed for real time" functions such as fuel, emissions, and traction control data.

The following control units operate on the F-CAN network:

- DLC
- Gauge Control Module
- PCM
- SRS Unit
- TPMS Unit
- VSA Modulator-Control Unit
- Yaw Rate-Lateral Acceleration Sensor

Messages on the F-CAN network are typically of higher importance, so the network uses a second wire for communication circuit integrity monitoring.