Blower Motor Switch: Description and Operation

The blower switch provides a choice of three blower speeds. The blower switch receives power from the fuse block when the ignition is ON. In the low-speed position, the circuit continues through the heater wiring harness to two resistors in the resistor assembly near the blower motor.

When the blower switch is in a medium-speed position, the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses one of the two resistors.

When the blower switch is in the HIGH position. the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses both resistors to provide full power to the blower motor.

From the resistor assembly, the circuit goes to the blower motor terminal. The blower motor circuit is completed to ground by a wire in the heater wiring harness that goes from the blower motor terminal to a terminal at the cowl panel sheet metal near the blower assembly in the engine compartment.