The ABS system is located right in front of the car, between the radiator and the belt/pulleys, on the passenger side. Its some kind of "box" with a bunch of lines going in it.
Like the other post said you can look on the pass side and there is a aluminum box that is the abs control module and it should have about four brake lines coming into the top of it. The other way is to watch for a abs light to lite up when you start the car is should come on for a few seconds and then go off. This is a self test and will only happen if you have a abs system.