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Don't know about the horn (mine started working again when I replaced the battery), but for the rear defrost, the likely culprit is the little box hidden behind your passenger C-pillar. This migraine clouds my memory as to the exact name of the part, but if you use the 'search' function here for rear defrost I'm sure you'll find a few threads about it.
Is your radio reception also a bit fuzzy? The antenna and defroster both go through the stupid module and it tends to fry. It's about $100 at your dealer. I have one in my car that I just haven't installed yet.
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