What is the function of Qi Jun automobile relay?

The relay uses a switch to control the relay coil, and then closes or disconnects the working contact of the relay. One end of the contact is connected with the main line current, and the other end is connected with the controlled appliance, so as to control the large current with a small current to prevent the switch from being burnt out by the large current. Protect lines and switches. If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.