My rear defogger doesn't work anymore. The light turns on when I push the button, but the defogger never warms up. My thinking is that the relay is possibly bad as I've checked the fuse and it is not blown. There are a bunch of relays under the hood in the fuse box except there is not a description of which one does what. If one of these relays is for the rear defogger and you can point out which one it is, I will be most grateful. I worry the dealership will charge a lot for testing etc... and a few bucks for a new relay is worth trying first. Also, it is a Civic Si if that makes any difference.