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FIRST I WOULD CHECK THE HORN FUSE OR RELAY ...CHECK YOUR OWNERS MANUEL TO SEE FOR LOCATION PROBABLY UNDER HOOD IN A RELAY STATION BOX.IF THOSE ARE GOOD..THEN POSSIBLE BAD HORN ITSELF OR BAD CONTACT BEHIND THE DRIVER AIRBAG,STEERING WHEEL.
If the horn nor the steering wheel mounted cruise control switches work, it is likely that the problem is the contacts that are in the steering wheel and the steering column that send the signal for these switches. You have a circular type contact that rotates with your wheel, and a stationary circular contact on you steering column that the steering wheel fits over. Good Luck. I hope you find this very helpful!
Although I don't think the cruise is an issue for safety, reach in under hood , or in grille area and find your horn(s) and just pull the connector off them temporarily, so they won't blow & put fuse back in and see if cruise starts to work again. It's not unusual for circuits to be labeled wrong or not at all in fuse panels. Then you can turn your attention to horn problem.
it may need a charge of 134a,to check to see if the compressor is good then unhook the plug at the air dryer(silver canister) should be a light green wire and a black wire,put a paper clip as a jumper between the 2 wires and turn it on,if the compressor works then you need a charge,if it doesnt work then it could be a fuse or relay but that doesnt happen too often