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It could be the relay under the hood or the fuse. The easiest way is to first check if your air conditioner works if it doesn't your Air Conditioner/Horn fuse is blown. Then disconnect horn in the front of the car and connect a multimeter set to dc voltage to the connector of the car and have someone press the horn, it should show 12 volts if not your relay is bad. Also the horn has a screw on the back with paint on it loosen the bolt and unscrew the screw a bit and screw it back and connect it to the car and press the horn if no sound then you will have to replace your horn.

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Q: The horn stopped working on your 2004 Elantra does anyone have any ideas on why the horn stopped functioning?
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