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If it were just the steering wheel controls, I would suspect the steering wheel control module (large relay in the relay panel) but since the horn is out too I would suspect the spiral spring assembly.
nothing you can do to repair it, you just replace it. Just to make sure, I would pull that steering control module from the relay panel and let it sit for a few hours, and then reconnect it, and test the functions.
it is in the relay panel under the driver side dash- it takes up a space about twice the size of a normal relay