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Re: I hope you can help me!!!!!!
It sounds as though you are having a security (alarm) system issue. Does this vehicle have an aftermarket alarm installed? If you recently bought this car, it might have one that you don't even know about. Try locking and unlocking both front doors with the key. If the vehicle has a factory alarm system, this is the usual way to deactivate it. If that does not work, look up behind the dash on the driver's side. An aftermarket alarm system is usually pretty easy to spot as it'll have a bunch of wires connected to it that are usually wrapped in black tape and you can tell it's not factory installed. If this is the case, there will be a valet switch somewhere in the vicinity of the driver's kick panel. To turn the alarm off, turn the ignition switch to the on position and press the valet switch. This should turn the alarm off.
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First, I would change the air filter. Check the air horn on the throttle body for carbon build up. A dirty airhorn can throw the air-fuel off enough to make the engine run poorly. If the air horn is dirty, clean it by saturating a clean shop rag with automotive solvant and carefully wipe the carbon out of the air horn. Do not spray the solvant into the air horn. If you haven't already done so, take your vehicle to one of many parts stores that will run a diagnostic computer for free on your vehice. If this turns up nothing, get engine specs for your vehicle. Now check the engine firing order. If this turns up nothing, connect a fuel pressure meter and check the fuel pressure. Check all wires and connections related to the engine sensors for shorts, bad wires, or corrosion. Also, a low battery can cause problems on modern vehicles. But a handheld diagnostic computer should isolate the problem.
Check that the two wire connectors are firmly pressed into the metal tabs on the horn. If not, your battery could be low (but your engine would barely turn over if your horn is so weak). Most likely, your horn is nearly dead (the permanent magnets in your horn have gone bad from rust - water damage- or too much heat).
When you say it doesn't start, does that mean the engine cranks when you turn the key but won't fire, or absolutely nothing happens when you turn the key on? Does anything electrical work; headlights, horn, dash lights, radio?
I will give you a general answer. Some cars have an Ignition relay in the powerbox and when you turn on the Ignition key, it activates the relay.
Now you can go to Autozone.com and register your vehicle for free and then print out images of your fusebox and chassis diagram.
The horn relay is the same on many Ford and GM products. You can switch the relays or test one relay with the horn button. If you can not get the horn to work after you put in the former Ignition relay, then the relay was bad. You can also use the former horn relay to start your vehicle.
When you ask for info, you do need to let us know what you are driving.
that sounds like the horn contact ring is faulty. this is mounted underneath the steering wheel and basically conducts the voltage through to the horn switches. had quite a few with the same symptoms and would check this part first. hope this helps
sounds like you have a short in the horn wiring or a bad ground wire these grounds are mostly located under the engine compartment near the back wall whitch is called the fire wall or beside the fenders