Try checking for other things running on the same circut like a power point or cig lighter they would make the fuse blow also.
Horn may be shorted internally. Try pulling the connector off the horn, put in a fresh fuse, see if it blows.
If it still blows, you have a short in the wiring or the relay. If there is no obvious short in the wiring, change the relay.
If the fuse doesn't blow with the horn disconnected, replace the horn.
SOURCE: 2006 pontiac grand prix
check with a test light if you have poer to horn 12if not could be horn button.or relay.
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