Question about 1994 Buick LeSabre

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The horn starts blasting on it's own without anyone in the vehicle, or tampering with the car. Is this related to the clock springs?

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  • Steve Michels Mar 14, 2011

    Thank you, Kato Tech. This answer makes sense, and provides a testable solution path. I appreciate your assistance. Lacking any fashion of remote entry, the intermittent short or in the horn switch, or wiring makes the most sense. I was able to shut the horn down by slapping the left side of the horn pad on the steering wheel. I then disconnected the battery ground to assure peace through the night. The clock spring reference is to the device that returns the horn switch to the neutral position (no literal clock suggested there)... thank you! Steve M.

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This would have nothing to do with the clock. If the vehicle has a remote lock/unlock that beeps the horn when the car is locked or unlocked, or has a panic button feature, the control module for this is the first suspect. It could have a horn relay driver transistor that occasionally breaks down.

The second possibility is an intermittent short in the horn switch wiring in the steering column. This may be affected by the weather (it could happen more often hot, humid or cold conditions).

A third possibility is a short in the wiring to the horn relay (a loose strand of wire, bad insulation or even dirt) which bypasses the relay. A quick check for this is to remove the horn relay if the car will be parked for a while. If you still get the horn going off, this is where you start looking. If all remains silent and the problem comes back when you put the relay back in, it's one of the first two. The relay itself is not likely to be the problem, if it was getting stuck in the on position, it wouldn't hang until it is first turned on with the horn button or remote control.

Posted on Mar 14, 2011

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