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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
It takes a lot less power to blow a horn. I have been reluctant to use horn or lights as an indication of a good battery. To find out definitively, jump start the vehicle; if it starts you need atleast a batter maybe an alternator as well. If it does not start with a jump possibly bad starter or power to the starter. I would eliminate the battery first.
replace your battery. Even when a battery is dead it will still have enough juice to operate smal things like the horn and radio, but not enough juice to start the car. If the battery is dead you should still be able to jump start it and take it to autozone and they can check it along with the alternator at the same time.