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Hi take the wires off the horn and using a set of jump leads from the battery conet the jump leads onto the horn and see if it works then, if not horn faulty, if works blown fuse or a broken wire regards
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You may have wires that have become crossed. The wire to the horn and a hot wire have probably lost the outer insulation and crossed each other causing the horn to start honking when it is connected. Check the wires with an electrical tester.
if the horn unit has electricity going to it when applaying the and its grounded good then you might check its router thats right under the steering wheel if its good the the Horn needs to be changed.
red light? this is a factory alarm?? Is GM on the key fob? factory alarms dont have "motion sensors" and very few aftermarket alarms do. roll down the window and set the alarm, now open the door and see if it lights off.
sounds like the horn contact terminal inside the steering wheel got disconnected and is hitting a metal part of the steering column which triggers the horn. the terminal that got disconnected is probably has positive polarity and the metal part of the steering column has negative polarity. If they come in contact with each other... *honk* *honk*
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