Auxiliary HVAC Control Assembly
WARNING: This page is about a different car, the 2002 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary HVAC control assembly is a non-class 2 device that interfaces between the operator and the auxiliary HVAC system to maintain air speed and air distribution settings. The ignition 3 circuit provides power to the auxiliary control assembly.