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Anyone have any idea what could be causing this.. happened 3 times now. When the car is parked the horn has randomly started blaring like you were in there laying on it. It only stops once you get in the car and press the horn. The first time after stopping it, and locking car with the key fob, it started again. Only stopped when pressing the horn. This was a month ago. I didn’t have the car and didn’t know about it until today but apparently it did it again other day after locking. Changed the key fob battery after the first time and it was okay until recently. Did it again today. Any ideas? The only mechanic near me overcharges any and everything so knowing what I’m getting into first would be helpful.
 

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Woober Goobers!
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Do you have factory alarm. What color is the plastic cap on your ignition key?
 

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So, it is a steady "On" horn sound and not the alarm, which pulses on and off?

Are you handy enough to pull the airbag off the steering wheel and disconnect the horn wire? If you still have the
symptom after disconnecting the horn switch wire, you can eliminate the switch that is under the airbag cover from
the process. (Process of elimination, starting at the horn switch.)
 

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Woober Goobers!
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After rereading the first post....it does seem the airbag cover/horn switch might be the cause of the problem.
 

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Having the same problem w/ my 2002 Intrepid -- car will be sitting (sometimes for days) and the horn(s) will suddenly activate. It's a solid tone, not pulsing as with the alarm. It can be turned off by pushing the horn button. From the list of possibilities in PDF below, I question if it's a bad clock spring (internal wiring that wraps around the steering column) or sticky button b/c it happens with absolutely zero movement of the wheel or pressing on the wheel. Also question if it's a bad relay, b/c IMO there is no way it could stick itself in the "on" position without being activated first by a horn button. So far, this has only happened in my driveway, but if it happened elsewhere, it could fry the horns, plus REALLY piss off a lot of people. (PS: the pdf might be for a first-gen Intrepid, but I expect the 2nd gen is similar.) All comments appreciated.
Font Rectangle Parallel Number Document
 

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Shorts can be intermittent often triggered on or off by temperature changes. Perhaps your horn always goes off near the beginning of the day when things are warming up or cooling down. Just a suggestion.
 
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