This was one of the links that google showed searching for 'saturn radio
unlock 2000'
http://www.saturnfans.com/forums/showthread.php?t=94012



"stonecreek" > wrote in message
...
> Here is what I have found out so far. On my particular radio, once it
> got locked, depress keys 1 and 2 at the same time. After a few seconds, a
> 4 digit code pops up. Saturn calls some magic number and gives them this
> code, then they get the real code back from the magic people. Then
> supposedly, if you do the keys 1 and 2 again and get the 4 digit code, it
> should be changed to the code that Saturn gave me. The only thing is, the
> service guy told me the key has to be in the run position, not motor
> running, and radio off, for an hour for this to work. I came home and am
> waiting because I didn't want to hang out there for an hour. We shall
> see.