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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.
Disconnect the negative battery cable so the air bag doesnt deplore their to are two screw on the steering wheel to remove the air bag then uses a steering wheel puller to remove steering wheel if you dont have a puller go a part store to rent one.
It sounds like your clock spring, as we call it, has failed under the steering wheel. To remove the assembly you must first disconnect the negative battery cable to avoid deploying the air bag. There are 2 to 4 screws on the back of the steering wheel holding the horn pad onto the wheel. Remove those screws and carefully lift the horn pad off and disconnect the wire plugs. The horn wire is usually red and the air bag usually yellow. You will need a cheap steering wheel puller from the local auto zone to remove the steering wheel. They have a small round disc type that is easy to use and cheap. Now remove the large nut from the center of the steering shaft. Install the tool and remove the wheel. Now you will see a large round disc or air bag ribbon held on by a clip. use an pick tool and a small screw driver to remove this clip. Now trace the wires under the column and unplug the other end and you can remove the ribbon or clock spring. Now feed in the wiring for the new ribbon and reverse the process to reassemble. While you have the horn pad off test the horn switch to see if the horn pad is bad and may need replaced also. If the switch is good find the horn relay in the fuse box under the hood and see if when you press the horn does it get power from the switch. to test the horn itself apply 12volts to the two connectors on the horn and if it sounds it is OK. The system is made up of horn, horn relay, and horn switch. Thanks for looking for a solution at Fixya.com.
You will have to replace the entire clockspring. I highly recommend having it done at a repair shop because it involves removing the air bag which contains a small explosive device and can be dangerous to someone not trained in removing it.
The problem is the coiled ribbon contact under the steering wheel (we call it the clock-spring contact) that connects the stereing wheel controls to the steering column wiring harness, this is a printed circuit that is coiled to allow the wheel to move and still have a psychical contact for the wheel switch's and the airbag, anyway replace that contact coil, u must disarm the airbag to do this repair, follow the factory procedure to do this or serious injury can result if the airbag fires.