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1991 Mazda Probe. 22k miles. On a couple of colder nights the horn has just come on. By itself. Car is in the the garage.


I've gotten it to go back off by hitting the horn honking area in the center of the steering wheel. After getting it to go off I can get the horn to sound with just the slightest touch of that area of the wheel. Doesn't seem to do this during the day.

Diagnosis?
 

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Auto horns work by sending currant to and through the horn on to the button in your steering wheel. You complete the circuit by grounding (pressing) the contact to make the ground. The fact that this happens only when it is cold indicates contraction of some point of the system, most likely within your steering wheel inter parts. This problem I have never heard about before, but there is no limit as to what can happen.
 

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Wow, I'll bet you're popular. :)

Sorry, I know nothing about car horns. I thought you were referring to a cow and was going to suggest taking it to the vet. With the cow in a chute, he/she will put a ring thing in it's nose, turn it's head to the side, and cut off the offending horn with a string saw.

Oh well, on to the next post... :)
SBJ
 

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Had this exact same problem with a new Cadilac Coupe Deville. That car was put togather so tight that when the temp. dropped after dark in winter the humidity in the car's interior condenced enough to short out the horn switch. Left one window open just a bit unless rain was predicted and this let the warm air excape to the outside.
 

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We once had a car where the central automatic locking started to go on & off by itself when it rained (it sure was funny to see the car parked in the driveway with the locks going 'click-click' and the lock buttons popping up & down by themselves); a short while after, the electrics died on the highway at night - alternator brushes were gone. Make sure your alternator is in good shape and your battery is getting fully charged.

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