As the name suggests, the heater is used for warm air, just like air conditioning.

The heater is first controlled by the air conditioner main switch. When the air conditioner switch current is turned on, the battery positive pole passes through a total fuse through the ignition switch IG gear and then to the central circuit board and then passes through an air conditioner to the air conditioner switch. The air conditioner switch is divided into several routes. If you don't say it, the air conditioner of the heater will come out and the coil of the heater relay will be connected to the inside of the central circuit board. Then the grounding coil will generate a magnetic field to close the contact. At this time, the current of the heater running at the low speed will pass through the central circuit board. An insurance through the relay contacts to the heater switch from the heater switch to the four lines are respectively 1 2 3 4 lines to the highest-speed line of the speed-regulating resistors to connect the heaters so that the rotation of the gear current from the different lines flow past