I had the same issue with the rear defrost. The Dealer had charged my $110 to replace the Defrost/Radio module. After 11 months I started smelling a burning plastic odor. This Really freaked me out! I would always spazz and start to sniff everything, but I could never find it. Once morning I noticed the defrost wasn't working. So I changed the relay without any results. So I Bought a big Torx Fitting for my ratchet and then removed the Passenger side seat belt. Then use a tiny flat head screw driver to pull out the center of the hanger hook. As soon as it is free the hook will drop down. Everything will pop off just Pull. Some of the plastic clasps might break but try not to break too many. Disconnect the module and then unmount it from the vehicle. The connector will be Unusable. Just cut off the connector. Use a knife to cut the corners of the module only one side. Fold it over and you will see the two male prongs. Solder heavy gage wire onto each of the two prongs. Use the old connector to reference which wire connects to each prong. Close up the module with Super glue or Black Tape. Reinstall it in the vehicle. Strip the wires from the module and the vehicle. DO NOT BLACK TAPE THESE CONNECTIONS. Instead use butt connectors. That should solve the issue.
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Now I just have the problem of my car stalling and not starting. What junk. lol