The following is an Air Conditioning Amplifier that shows the mechanism of the blower motor resistor in a four-wheeled vehicle. As illustrated here in the wiring diagram, when the heater control is set to a higher position, the contact of the HTR relay is closed, current flows to the blower motor, and the blower motor operates. The blower motor speed can be changed by exchanging the ground, and the blower resistor circuit with the heater control is also termed the blower switch. With the help of EdrawMax, you can easily create wiring diagrams that will help you understand how such an intrinsic system works.
