horn

hey guys, im new to auto electronics but i have a write up telling me how to intall a piezo(sp?) buzzer to make a chirp when i lock/unlock my doors w/ my factory keyless entry on my 94 chevy impala ss.  my question is can and how do i replace the buzzer w/ my current car horn?  ho would i go about wiring.  i also dont know anything about relays or any of that stuff.  any help is apreciated.

Depending on what your buzzer circuit looks like, it should be easy enough to put together a circuit using a transistor to take whatever signal you have and use it to drive a relay. The relay is needed to switch enough current to honk your horn, with the transistor taking the low power signal from your circuit and turning the relay on and off.