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Hello I will help you with your question,
Do you have a 12 volt testlight or voltmeter to check the circuit if I guide you?
How about a paperclip?
Good a couple of questions first and then you can test if necessary,
1. Is the airbag warning light on?
2. Does the horn sound if you push the button on the remote?
3. Do you have steering wheel buttons and do they work to control the functions (radio etc)?
Let me know and I will have you test the relay and fuse with the paperclip if necessary
OK, the horn button signal on the steering wheel passes through a "clockspring" connector to the rest of the vehicle so you can turn the wheel and still maintain contact. The other buttons that do not work pass through this same connector.
I believe the clockspring connector has broken on your vehicle so it will need to be replaced. The cost is about $300 to have installed.
You can use the paperclip to check this by removing the horn relay from the underhood fuse block and bridging the two larger contact sockets with the paperclip. These will be the ones the copper colored pins of the relay fit into. If the horn sounds then the clockspring is the problem.
Click here for relay location.
Replacing the clockspring should restore the function of the other buttons as well.
Let me know how I can help