Hello I will help you with your question,
It sounds as if your clock spring has failed. You will need to read the codes for your airbag system to be sure but the combination of your horn not working and the SRS light being on sounds to me like the clockspring connector that allows an electricl connection between the horn switch and airbag and the rest of the vehicle has failed.
If you have questions I will be able to provide more information in a little while, my information server is down and I cannot access diagrams or code information at this time. I will post the clockspring diagram as soon as the server comes back up
Here is the diagram that shows what is broken (#5)
Let me know if you have questions