Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN)
WARNING: This page is about a different car, the 2011 Honda CR-V, 2010 Honda CR-V, 2009 Honda CR-V, 2008 Honda CR-V, and 2007 Honda CR-V. However, it is still accessible from the selected car via links, so may be relevant.
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. This is called a Gateway Function.
Fig 1: Body Controller Area Network (B-CAN) And Fast Controller Area Network (F-CAN) Communication Diagram
- The single wire method is used between the units not requiring communication to move at a fast speed.
- Using a single wire method reduces the number of the wires used in the body controller area network.