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It sounds like you have some kind of problem with your security system. That will be tough to diagnose over the computer, but in the meantime you can pull the horn relay so it stops honking. Here is a diagram of your underhood fuse box. Pull relay #10. I circled. it.
It should stop the honking, but not solve whatever is causing it. Let me know if I can help sort that out too.
Let me know if I can be of any assistance.
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