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Q: Why does your horn come on when you start the ignition?
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Why does a horn not work when ignition off?

The ignition turns the car's electrical system on or off, in addition to starting the engine.


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To replace the ignition switch on a 1982 Mercedes 300SD, disconnect the battery and remove the horn pad. Locate the wire behind the horn and remove.


Why your service vehicle soon come on when you turn on your ignition?

That is normal but, when you start the engine the light should go out.


What would cause the horn to start blowing by itself and cannot be turned off with the key in the ignition switch?

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.


What does it mean when your Peugeot partner won't start and the hazard warning lights come on automatically?

HI THERE Id say that you hane a problem with your BSI unit which is Built-in Systems Interface unit which is located under the bonnet. I have had similar problems with a 04 berlingo and a 03 partner. Has your van been sitting up for a period? common symptoms are car turns over but wont start. Car starts but horn, wipers, heater wont work and the headlights come on when you turn on the ignition. I still need to get to the bottom of my problem with my Peugeot partner which has been parked for 3 weeks and when i went to start it the ignition lights were flashing it wouldn't start and the dims came on automatically when i turned on the ignition. So any help i would be greatful..


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When you turn the ignition key does the running light dim a little bit?


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