Canbus is short for Controller Area Network Bus, which can monitor the condition of your vehicle and send data to correspondent control units. This technology is originated in Europe. So vehicles like BMW, Audi, Volkswagen, Mercedes, Porsche and some of the American vehicles. It is a good idea to check the manual or asking the vehicle dealer whether the vehicle you purchased is equipped with Canbus or not before replacing any electrical products.. Canbus Drivers can easily eliminate the error noise when changing the light bulbs for some vehicles.  The Canbus Drivers can be easily installed, just easily plug and play. Canbus Driver will be a perfect solution for detect the LED headlight failure/bulb rejection,hyper flashing,no flashing or burnt out bulb indications. This suits H4 application.