Low Blower Speed
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
When the Low blower speed is selected, battery voltage is applied to the blower motor through the heater relay supply voltage circuit. Voltage is decreased through 3 series resistors to achieve the desired blower speed. The blower motor is grounded through the blower motor resistor at G201.