1994 Cadillac Fleetwood Owner's Manual - Page 163

I Electronic Solar Sensor I The Electronic Solar Sensor is part of the Electronic Climate Control System (ECC). The sensor monitors the sun's solar radiation by telling the ECC system at what intensity the sun is. The ECC uses this information to automatically make the necessary temperature adjustments. The sensor is located in the defroster grille. Rear Window Defogger To get fog or ice off the rear window, push the Rear Defogger button. With it,your rear window and both outside rearview mirrors are warmed. 150