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When you take the tank off (really easy, two little hoses at the petcock, and two 10 mm bolts under the seat) you can access just about all wiring that goes to the horn. But you may not need to take the tank off.
If the fuse is good, it's probably the switch. FWIW the horn is always at +12V when the engine is running - the horn switch is between the horn and ground (0V). And the two-tone color (yellow/green) wire at the horn is the one coming from the battery, the black one goes to the switch.
So with a multimeter you can a) test the switch by taking the black wire off the horn, and see if it makes contact with 0V (=connector of the big black wire at the battery, or mass) when you push the switch b) see if the horn is at 12V when the ignition is ON.
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2005 "Saturn Black", stock + tach
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