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2014 GMC Sierra 1500 Horn not working

WakeMeUpBeforeYou JOJO
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WakeMeUpBeforeYou JOJO Enthusiast

WakeMeUpBeforeYou JOJO

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My horn is not working. Neither when I press the center of the steering wheel and when I double click the lock button on the key fob. The 15amp fuse is still good and I can hear the relay clicking every time I engage the horn. I seen a video related to this subject on YouTube and they recommended cleaning the corrosion from the prongs of the horn plug. There was a small amount of corrosion on the prongs. I used a small file, cleaner and dielectric grease and still nothing! I then took the horn out of the truck and wired it directly to a battery to verify that the horn works and it does. I'm completely stumped on what to do next. Any suggestions would be greatly appreciated. 

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