Sorry I am not up on your vehicle, I am sort of stuck in the 1980's and on back with computer less Jeeps.
Other guys here may still jump in with possible answers things to try.
I was able to grab (screenshot) you the "Horn Circuit" wire diagram from "Prodemand"
Maybe you will see the possibilities of what may be causing the issue.
Keep us posted
The Medic
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Saturday, January 14th, 2017 AT 6:25 PM