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The horn switch or relay.Your ignition switch does not power up the horn switch or relay,the switch and relay have constant power to them at all times as long as the battery is hooked up.I would start with checking the relay and then go to the switch. Also, check the wire under the steering wheel cover. If this wire is gounding out it will case the horn to blow Probably moisture in the horn circuit. The horn is always hot. The circuit is made by completing a ground. This way, several different circuits can energize the horn easily, i.e., the car's alarm, which it may or may not have. Moisture bridging a certain wire/terminal with the chassis will make the horn blow. Brake lights are probably wired the same way. They can come on without pressing the pedal. Completing grounds to turn things on makes them easier to control with the car's computer. Pull fuse until it dries, then park in a more sheltered area.

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2005-11-14 22:28:12
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Q: What would cause the horn to start blowing by itself and cannot be turned off with the key in the ignition switch?
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