Horn Won't Blow........1990 560 SEC

[BigRed0803]

I was just wanting somemore direction if anyone has some to try and fix my family members horn on his 1990 560SEC W126. I know the horns themselves work because I can put juice to them and they will blow. I figured it was the connection plate on the steering wheel, so I took one of his other W126 that was working but this didn't fix it either. I have also changed the module or relay that controls the alarm system in the passenger side floorboard area. I have checked all fuses and I really don't know where to go next. He said the alarm went haywire before this horn problem happened and I unplugged it, then he needed the horn one day and that is how we found out it doesn't work. As stated above I then change out that module, didn't fix it. Does these cars have a relay for the horn? Or anything else that could make the horns not get juice? Any insight would be greatly appreciated.