Currently, ECUs are not only used in the engine of some mid-to-high-end sedans, but also found in many other places. For example, anti-lock braking systems, four-wheel drive systems, electronically controlled automatic transmissions, active suspension systems, airbag systems, and multi-directionally adjustable power seats all have their own ECUs.
With the increasing electrification and automation of automobiles, the number of ECUs will increase, and the wiring will become increasingly complex. To simplify the circuitry and reduce costs, information transmission between multiple ECUs in a car will employ a technology called multiplexing communication networks, forming a network system for all the ECUs in the vehicle-the CAN data bus.