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I looked at info for a Silverado 1500. Use a test light to check for voltage at horn fuse in under hood fuse box. According to this diagram, the horn relay has to be energized. Have a helper hit the horn switch when you check voltage at horn fuse. If hot, have to check wiring circuit to horn. In the diagram, dark green wire is voltage and black wire is ground. You could actually use jumper wires from battery for voltage and ground to horn, for testing.
Every horn I have ever found is on the passenger side at the front of the vehicle in front of the tire mounted to the frame. You have to remove the bottom cover to access them. Maybe the inner fender cover also.
No Switch just makes the connection in the steering wheel then the relay,and onto the horn.You may want to take a test light to check all the fuses.There are two fuse boxs.One under the hood on the drivers side behind the batterie,and the other on the end of the dash also on the drivers side.Well hope this helps ,and good luck.
First, make sure the fuse is ok. If it is, you'll have to inspect the horn contacts under the air bag. If you have to remove the air bag, be SURE to read up on the procedure before working with or removing the air bag!
It could very possibly be that your horn relay has gone bad. I believe you might find it on the inside of the front fenders or the inside of the radiator support. I'm an ol' Chevy guy so don't quote me!