this is where it gets tricky, if the pontiac has door chime u will need a special adapter if not go to your local best buy, circuit city or car audio shop and ask for a metra harness. the metra harness will just plug in the stock harness. now being i've done a install on a pontiac it might reqire an external power feed so if it dosen't work be prepared to do so. also u might need a dash kit. if you have never installed one, i don't reccomend you chop wires to install.