I've been unsuccessful in finding a wiring schematic for a blower motor speed controller controlled by an Electronic Automatic Temperature Control ( EATC) module in automobiles in order to test the various components. So I've taken one apart and thought I'd try drawing one myself. Attached is my start at identifying the component parts. I'm wondering if anyone can identify the large black component with the question mark on the upper right of the pix, and the totally black C-? component that looks like a ceramic capacitor ( but it has no markings). I'd also like to know what is the type of signal that comes from the EATC module that drives the blower motor control module....variable dc ??