CAN Communication System Description: Notes

WARNING: This page is about a different car, the 2007 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

ECM (2), ABS / ESP® control module (1), TCM (3), BCM (4), 4WD control module (6), combination meter (7), keyless start control module (5), steering angle sensor (ESP® model) (8) and yaw rate/G sensor (ESP® model) (9) communicate control data between each control module.

Communication of each control module is established by CAN (Controller Area Network) communication system.

Fig 1: CAN Communication System Diagram

Courtesy of SUZUKI OF AMERICA CORP.

CAN communication system uses the serial communication in which data is transmitted at a high speed. It uses a twisted pair of two communication lines for the high-speed data transmission. As one of its characteristics, multiple control modules can communicate simultaneously. In addition, it has a function to detect a communication error automatically. Each module reads necessary data from the received data and transmits data. ECM communicates control data with each control module as follows.