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  172 cup
well the other day my horn works and now it doenst even work when i press it, iv checked the fuse and still doesnt work.

i pressed it this morning and and it beeped for a short second then went off, any ideas.. i might have to take my bumper off to see the wireing
  BMW M3
The horn can be accessed from the passanger wheel arch. Just remove the lining. Maybe wiring down there, or water etc....