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The fuse box is on the drivers side in a black box near the hood release . There are 2 flat head screws to loosen and the cover pulls down and all the fuses are there and labled if not look for one with a broken fiament inside and thats the one thats bad there are also some under the hood also in a black box
It depends on how many amps the 2010 trail blazer horn uses & the size of the fuse for the horn in your saturn. The horn for the trail blazer should be labled on it somewhere as to how many amps it uses & you can find the horn fuse rating in your Saturn by looking in the owners manual. If U can't find or dont have the Saturn owners manual find the fuse block and the horn fuse location should be labled look for the fuse rating on this fuse, pull the fuse itself if U have to but remember to put it back. If you know the rating 4 the trail blazer horn and the Saturn horn before you try to switch them it will save U time and you wont fry the horn wires possibly in the Saturn. Good luck!!
When you take the cover off the relay box, flip it over. There should be a detailed diagram on the inside of it. You should see the initials for A/C and and Horn, Horn may be labled as H, or will say Horn.
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I wouldn't recommend removing the fuse, Im not sure on that particular year but usually a fuse has multiple functions not just 1 function. I would find the horn location and just un plug it. But Im curious as to why the horn is going off. Is it the alarm? If it is, I would take the car to autozone and have them test the amp output on the alternator and maybe a load test on the battery....
check your cab lites to see if water has gotten into one of them and corroded a hot wire off. and that it's not shorting out causing your problem. also take a look at the wiring going to your domelite.