Which remote start do you have? I am picking up my Focus in a lil and can give you the instructions when I get them. I have the bi-directional unit so I am not sure what the differences are between the normal unit as far as programming.
So I don't see any specifically about your remote but when I get home, I can upload the directions to the bi-directional programming mode (no instructions of how to turn off the horn) and you might be able to go from there. Trying to be as helpful as I can.