it sounds like you already checked relay 11(pcm) with the horn relay if that relay is good and the groung is good and its geting swiched power when you turn the key on then the computer has a bad ground located by the power steering resivor or the pcm is bad.
you might want to call who ever removed the alarm and ask if they had to cut and splice any wires, its posible one of the new conections failed
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