Where is the horn relay fuse located on a 2002 corvette?

There isn't a separate "horn relay fuse" in a 2002 Corvette. The horn's power is controlled by a relay, but that relay itself is controlled by a fuse. The fuse protects the circuit *feeding* the relay, not the relay itself.

To find the relevant fuse, you need to consult your owner's manual. It will specify the fuse number and location (usually in the fuse box under the hood or in the passenger compartment). The fuse is likely labeled something like "horn," "accessory," or possibly a more general label covering several circuits.