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Good evening. Is the stereo itself working? Is it just the steering wheel controls for the stereo that are not working?
Ok. As far as disarming the air bag, you would disconnect the battery and leave it disconnected for at least 10 minutes before starting disassembly. I have attached the procedure for removing the Air Bag Module. Once it is removed then you will need to remove the steering wheel. Make sure the steering wheel is straight ahead and remove the bolt or nut that's holding it. A puller may be required to pull the steering wheel off the shaft. These pullers are easily rented at local auto parts store if you do not have one or need one. Once the steering wheel is off, you need to remove the steering column upper and lower covers. Then there are 4 screws that hold the clock spring assembly, remove these screws and remove the clock spring and disconnect the connecters.
Here is the Air Bag Removal if the link wont open.
Removal & Installation
Sorry for the delay in responding. I cant get the pictures to work correctly. On the back of the steering wheel will be two small access panels. The small panels will pull out with just a little pressure and then remove the screws in the access holes. Once you remove the screws the air bad will pull straight out.