Ummmmmm, my defroster n heater doesnt work when the vehicle is running, but turns on by itself when you turn the vehicle off. This makes the battery drain and I have to disconnect the battery every time I park, anyone know why its doing that? Also, I've read that on Renix systems, you can diagnose lots of problems with a multimeter, if someone could explain what kinds of problems you can diagnose with that, that'd be great.