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In a 2008 Chevy Silverado, you can find the horn relay in the fuse panel under the hood. Check the panel cover to locate it among the other fuses and relays. If your horn isn't working, start by checking the relay. Replace it if it's bad. If the relay is okay, inspect the horn's wiring for any loose or damaged connections. To test if the horn is faulty, try applying 12 volts directly to it to see if it makes a sound.
It's not in the fuse box under the hood, and it's not labeled as a horn PCB either! Some people need to stop spreading false information. If you're not sure, it's best to stay quiet!
There is no relay present in the fuse box under the hood, only a 15 amp fuse. I am facing an issue with the horns in two Silverados I have here, and neither of them has a relay in the box!
The horn relay for the 2008 Chevy Silverado is located on the relay panel within the main fuse box.