I know there have been numerous posts on modifying fog lights and daytime running lights (DRL). I think I've read almost all of them, but I'm trying to do something a little different. Does anyone know exactly what goes on in a 2005 Prius body ECU between the blue wire (from the fog switch on the external lights stalk on the steering column) and the yellow wire (to the fog relay) ?? I'm looking at a Haynes electrical diagram and yes, eventually I will get better documentation. I'm new at this....... Thanx
