Find the horn, usually beneath a head light assembly and in front of the radiator. remove the wiring connector and jump the battery right to the horn's electrical connectors. if the horn does not blow, go buy a cheap universal horn off the shelf at a parts store. if the horn blows then you need to replace the switch which is inside the cosmetic cover in the center of the steering wheel. this may be tricky, depending on the age of the car, and if it is old you just will not be able to locate the part.good luck
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