Blower Motor Control Module
WARNING: This page is about a different car, the 1997 Oldsmobile Cutlass Supreme. However, it is still accessible from the selected car via links, so may be relevant.
Module receives commands from A/C-heater control unit, amplifies them, then varies blower motor speed. Command signals are based on blower and mode selections, set temperature and outside temperature. For example, if the in-vehicle temperature is much colder or hotter than vehicle operators set temperature, and AUTO mode is selected, the blower motor control module will decrease blower motor speed as in-vehicle temperature nears set temperature.