Blower Control Module
WARNING: This page is about a different car, the 2001 Pontiac Bonneville and 2000 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
Blower control module is a solid state device sending and receiving signals to and from A/C-heater programmer. Blower control module controls blower motor by varying voltage between 0 and 12 volts (off-maximum speed). To determine appropriate output voltage, blower control module monitors a varying voltage signal (between 2-8 volts) from A/C-heater programmer and applies voltage directly to blower motor.