you install it yourself? you have an automatic right cause it won't work on a standard... trust me...
if you did do it yourself make sure you hood switch is hooked up correctly, and you need to go over your connection on more time... the numbers that are on the instructions are on the actual plugs, as there are a couple of the same color wires in the same area especially under the glove box so trace them back and make sure you got the right one... if you did tap the wrong wire untap it and use some electrical tape (or push out the pin and use shrink wrap though that can be a pita) to cover your tap marks.... not sure what exactly your problem is does the horn just beep or go off a certian number of times?