my rear defogger didnt work when i bought the car either. no breaks, it just didnt work.
i brought it into the local shop (before i had put any time into the car, and i knew nothing about it) and had them fix it. Before i brought it in, the factory alarm did not work (and i didnt know there was a factory alarm...), but when they gave me the car back both the factory alarm and the defogger worked again.
so im assuming both the alarm and the fogger are on the same board. does your alarm work?
94 Mx6 with a big sway bar. 12.86 @ 116 on an FMU...
Built buy Me, ebay and zip ties.