Hmmm... appears to be a similar system to the stock horn "button" in my Saturn VUE. When that eventually failed, it was no fun. The horn would randomly go off... a couple of times at around 3AM when everyone was asleep in the house. That was while we still lived in Germany. Ze Germans REALLY value their quiet hours.
Anyone ever been shouted at in a foreign language by some sausage-swilling old man in his underwear?
The kicker is that to replace the horn button, you have to buy a new airbag... for ~$600. I rigged an alternative solution. Just hope it doesn't wind up embedded in my forehead (or my wife's) should the airbag ever go off