horn sound when locking car

Hello i need some help with wire something up on my car and if you can part numbers and where to buy what i need would be great.. ok here goes i have a new 2008 sx4 crossover and the dang thing has everything i need accept when i lock the car when the remote the horn does not sound only thing that does work is the turn signal lights flash can somebody help me wire up something to make the horn flash i lock the car cause i just cannot hook the horn too the turn signals ahahah that would make the horn sound every time i turned them on i hope this all makes since i am new too this please understand I think i need something like few relays 1 to make the horn work and run to hook somewhere to work when the power is off that way it would only work if the key was off not sure Thanks for the reply in advance I hope some body can help me :) AL

as a general statement, if you can find the output on the factory alarm system before it hits the parking light wire to tap a relay in there for the horn. sounds do-able

so if i find that wire how would i hook up the relay ?

If you find the output is too long and annoying (which is most likely the case), you could add a drive circuit using a transistor and a few components to make the honk time adjustable to whatever sounds good. Less than a dollar in parts, if you're willing to do some simple work connecting the bits .