horn broken, watch for finger

one of the things wrong with my friends 2005 Sunfire is the horn not working. the fuse is ok and the horns are plugged in. where is the relay? the other thing is the p.o. put in a nice stereo but wired it in so the wire to turn it one is wired to the battery as well as the memory and when he sold the car they took the amp out and left the wires hanging,:mad: so i have to trace those out and disconnect them as well as run new speaker wires. i need to go to pull and save and look at the sunfires they have there. there seems to be trim pieces missing.
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