My horn does not work. I checked to see if there were Fuses associated to it and the diagram does not indicated the horn has any. I recently had the front bumper replaced due to small fender-bender. Could the repair shop not have connected the horn? Before time consumer visits to the shop I would prefer to check the easy options first, hence Fuses.
If it is a fuse issue, what #? The 650i has fuse boxes in the trunk and glove box.
I will gladly donate but if the only option is a repair shop then not sure warranted.
These are all questions that you will have to answer by looking and testing. Locate the horn and see if it's connected and if it is, test for power at the horn when the button is pushed. Depending on the results, we can go from there.