Welcome to the forum! I've actually have been asking the same thing, the horn on the lock cannot be deactivated at all by the owner, the only safe way to do it is by using the key to manually lock the car, or else it'll just keep beeping every-time you lock the car. As for the subwoofer cable, I'm not sure what you mean by that, and what audio system is in your car? You might be able to find what your looking for on eBay (the US site).
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