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could be fuse , horn switch, horn itself or wiring. if you have a multimeter place across the horn terminals on dc volts and have a friend sound the horn, do you get 12 volts on multimeter, if not then your horn is ok . check your fuse box for any blown fuses. most fuse boixs have detail on lid of which fuse does what.
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!!
disconnect the horn or horns, operate the horn and see if the fuse still blows. if the fuse still blows then there is most likely a short in the wiring. relays rarely cause shorts. if the fuse doesnt blow with the horn disconnected, reconnect the horn and operate the horn again, if the fuse blows you have a shorted horn.
Check fuse. Usually located under the Steering wheel or under the hood. You will have to use the other side of the cover to determine which fuse controls the horn and see if the metal link is broken. If both are not blown its probably a short in the wire. If it randomly just happened then its a good first guess without knowing any further details.
Usually I check all my fuses any time I am looking for a specific one. Sometimes a random fuse can be the cause, and not the actual Horn fuse that is blown.
check the fuse if the fuse is good use a test light on the wire going to the horn if it lights up when you press the horn button then the horn itself is bad if it does not light up it means no power to the horn ,check fuses first ,and make sure the horn is grounded to metal, if you run a wire from the positive terminal of the batt. and touch it to the wire going into the horn the horn should work if not bad horn
Check ALL the fuses with a 12 volt test light.
Change all that are burnt.
Also.....check the wire going to the horn (at the horn) with your 12volt test light if the fuses are good.Have someone push the horn button.
It might be the horn or horn relay that is defective.....not just the fuse.
I replace more horns than fuses.
you may need to put a relay in it as the current from the horn may be back feeding up the immobiliser horn circuit and causing a short. Sounds like the immobiiliser has its own source of power seperate from the factory circuit When you press the horn the power goes to the horn and up the immobiliser horn circuit and it blows the fuse.
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