Safety parts must use a separate fuse. Safety parts include not only those defined by the national standard, but also those defined by the OEM itself, such as position lights, width indicator lights, low beam lights, etc. It is necessary to configure separate fuses for such parts.
Class A important parts (referring to the functions essential for the operation of the car and the safe operation of the car) must be equipped with separate fuses, such as engine ECU, ABS, etc., which have a great impact on the performance and safety of the vehicle, and other electrical devices that are susceptible to interference from other electrical equipment , it is necessary to prevent the fuse from being broken due to non-important circuits, causing unnecessary flameout of the car;
Class B general important parts (refers to important functions, but does not affect the operation of the car, does not affect the safety of the car function) according to the actual use of fuse combined design. Such as engine sensors, various alarm lights and external lights, horns and other electrical devices;
Class C ordinary parts (referring to other functions that bring convenience to the use of the car) allow the sharing of fuses. Such as car audio system, electric heating seat, glove box lighting, electric rearview mirror, electric window system and so on. This kind of electric load is not very important to the whole vehicle. Generally, electrical equipment is added to improve the comfort of drivers and passengers.