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Check the Horn Relay (in fuse box under the hood). You will need to check for Circuit continuity between the Relay and the horn button. There must be a loose connection under the dashboard or in steering column. Pressing the Horn button Grounds the circuit, so check the circuit from the relay to the horn button for continuity to ground.
Often times when the air bags deploy the horn buttons are damaged,the quick solution would be to install a push button to ground the horn wire. Just hook one side of the button to ground and the other to the horn wire.
All cars are a bit different. I suggest you look at a Chilton's Repair Manual available in most large public libraries to get an idea. Air bags are not that easy to deploy by accident unless you get a bit vigorous with tools. Usually the cover just pries off exposing the horn mechanism. The removal of the air bag assembly is best left to experts. I highly recommend the purchase of the Haynes Repair manual for your car; at $27 its well worth the investment. It will provide the technical detail and tools list to be able to do 98% of all repairs. A service technician charges $50-$75 an hour, so the savings alone in the first use of the book will be worth the detailed solution. A new air bag unit costs $350 to $600 depending upon make and model, so it a decision not taken lightly. Sorry I can't provide you more info.
If you bought the car at a dealership, all saftey related problems should have been repaired before the vehicle is sold, at least thats the law in Canada, If your air bag light is not on, the air bag should work correctly, the air bag module is the center of the steering wheel where the air bag is contained, usually the horn circuit is seprate from this module and is more common for a clock spring contact to cause you issue. The clock spring is the contact point to allow the steering wheel to turn and yet keep contact with all the other steering wheel controls
YOUR HORN PAD AND AIRBAG COME AS A ONE UNIT.YOU HAVE TO REPLACE AIRBAG BEFORE YOU HAVE HORN CONTROL AGAIN.BEST TO TAKE VECHICLE TO DEALERSHIP BECAUSE TRYING PUTTING IT IN AT HOME IS DANGEROUS AIR BAG CAN DEPLOY WHILE TRYING TO PUT IT IN.
you have to replace air bag . because your horn pad contact switches made in bag . when bag deployed it mess your contact switches .its going to cost you 700.00 dollars. have to fix it . or your car wont pass state inspection.sorry it happen . good luck.