Blower Control Module
WARNING: This page is about a different car, the 1998 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
Blower motor operation is controlled by a blower motor control module. The blower control module receives command signals from the programmer. Blower motor control module amplifies and applies the signals to the blower motor to vary its speed. Command signals are based on following factors: blower motor setting, mode selection at A/C-heater control panel, selected temperature, solar sensors, and difference between in-car and selected temperature.