2010 Corolla - Car Horn Going Nuts!

#1
So my car horn on my 2010 Corolla S woulnt stop honking when I lock the doors. I have to turn the car on for it to stop. Anybody have this issue? Any help would be appreciated!
 
#2
Only thing I can think of is a short of some kind. I would take it in for a diagnostic check, when the doors are locked the horn is controlled by the computer so it should show if something is not right.
 
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