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

The body controller area network (B-CAN) and the fast controller area network (F-CAN) share information between multiple electronic control units (ECUs). B-CAN communication moves at a slower speed (33.33 kbps) for convenience related items and for other functions. F-CAN information moves at a faster speed (500 kbps) for "real time" functions such as fuel and emissions data. To allow both systems to share information, the gauge control module translates information from B-CAN to F-CAN and from F-CAN to B-CAN.

Fig 1: Identifying Communication Line Diagram

Courtesy of AMERICAN HONDA MOTOR CO., INC.

• The single wire method is used between the units not requiring the communication to move at a faster speed for "real time" functions such as fuel and emissions data.
• Using a single wire method reduces the number of the wires used on the body controller area network.