1999 Ford F350 Horn blows on its own

Well here is how it is wired. It starts with fuse 12 in the fuse box it is a 15 amp then goes to the horn relay and from there to the GEM module and the cruise system at the steering wheel and to the horns. So next time this happens I need you to unplug the horns so you don't have to listen to them and check the dark blue wire at the steering column at this wire comes from the horn button if this has power then horn button is causing the problems otherwise we need to check GEM module ok. Let me know what you find ok.