Well , you know the one I have with rear defrost is sitting out side with no light and cold as hell..lol.. Looks like if they are like any other cars, and have the connections at the bottom of the glass, then the seat/belt pillars will need to come off, as I could see no other connection visably with those in place. There not hard to get off, I hope I`m wrong and theres a connection easier to get at--but that would be the next place to check from the circut breaker on, (since thats ok) then the elements themselves, should be getting juice to at least there, checking there would be my next stop .