Electronic Control Modules (Service Information): Communication: Operation

This model uses four buses: CAN B, CAN C, diagnostic CAN C and the LIN (Local Interconnect Network) data bus. CAN B and the LIN bus operate at a lower speed than CAN C and diagnostic CAN C to provide communication among body and interior modules. CAN C is exclusively for critical powertrain, anti-lock brake and electronic stability program functions. The LIN bus is used on a limited basis for the steering wheel switches that control the EVIC. LIN is used for a local area where wires need to be kept to a minimum. The LIN used on this model is a single wire that takes information and places it on the CAN B bus. The diagnostic CAN C bus transmits diagnostic information to an industry-standard connector for access by service personnel using a plug-in scan tool. This system allows diagnostic data to be obtained from the other two bus systems without affecting the functions of either.

The added communication speed specifically allows the All-Speed Traction Control and ESP (Electronic Stability Program) modules to notify the powertrain control module when engine torque change or a transmission shift are required to avoid wheel slip and maintain stability. Data from control modules on the CAN-C network elsewhere in the vehicle, such as vehicle speed, is transmitted to the body and interior CAN-B network via an interface in the IPM (Intelligent Power Module).