HVAC Control Module
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control module is a Class 2 device that interface between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive and ignition 3 voltage circuits provide power to the HVAC control module. The HVAC control module communicates the mode door position to the vacuum control assembly through five solenoid control circuits. The control assembly supports the following features: