Many Control Units use CAN communicat to communicate with other modules. Through CAN a module and receive critical sensor values and information from other modules. CAN is useded for controlling power-train and other modules including TCM, ECM, CLUSTER is high and insensitive to electrical noise by spark generation is adopted to controlling power-train(TCM, ECM, CLUSTER,ESP,4WD,SAS, EPS). CAN communication consists of CAN BUS HIGH, CAN BUS LOW and two 120Ω resistances in circuit.