Audio Systems: reseting radio code, vin number, radio code

Question
I bought a factory monsoon mp3 player for my 03 Montana and
need to know how to reset theft code. i have the vin # that it came out of

Answer
dealer only you need a scan tool to write your vin number in to the new radio.
when the radio turn on it looks and ask the vehicle BCM  for the vin number it they don't much it shows locked

dealer only 1 to 2 hours labor fee one more way of gm to make extra money