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Q:

my horn started blowing, on its own ? why on 2005 Jeep Grand Cherokee

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when it starts blowing, i can wiggle the wiper switch and it will stop
(1) Answer
This generally means that you have a problem with the horn contacts inside your steering wheel and steering column. Possibly a piece from the horn contacts have broken off and fallen inside your steering column and it is grounding and activating the horn and the wiper lever moves it away from metal and therefore stops the horn. This is not uncommon.