The principle is not complicated. It is to add a temperature-adjustable heating body to the seat cushion. As long as the seat cushion is connected to the car power supply, the seat cushion can be heated. It is worth noting that the price difference of this product is very large. Ten yuan, expensive up to several thousand dollars.
At present, the car heating cushions that sell for tens of dollars are basically connected directly to the cigarette lighter. This method is easy to burn the fuses, and some car heating cushions are not directly connected to the cigarette lighter, and the installation process will also change. The line, and the voltage limit of each car is specified, once the new resistance is added, it may cause short circuit of the car current, and it may cause a fire. Therefore, it is not recommended that a car owner install such a heating cushion at will.