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First post here but not new to the vehicle forums. I have an 06 Cayenne S and the horns do not work. I did not check them when I bought it and am still new to the Porsche world. I guess I did not check the horn because I was still focused on the problems it was having with the engine. I ended up swapping the engine and still have the old one on the stand. I may rebuild it some day. But anyway, the horns do not work right now. I have checked the fuse. I pulled the steering wheel apart and found the wire for the signal. I do get a signal when the wheel is compressed so that is not the issue. I pulled one of the horns off and checked it on a spare battery by connecting each terminal to the + and -. It seems as though the horn does not work at all. I do know that this is a common issue. I checked to see if I was getting a signal out of the plug. I checked with a testing light and my meter for volts, amps and ohms. I did not get anything when the horn was pressed. So I have been looking for a wiring diagram. I don't know if the two posts in the plug are for + and - or if there may be some type of voltage regulation in the signal between the two and the ground (-) would be pulled from the chassis through the bolt. Does anyone have a wiring diagram for the horns? I would like to see the whole circuit.