I just got a call from a guy that I sold my 6 disc changer to saying he can't get the thing to work. I figured I should post on here and try to get some answers before I try to answer questions I am unsure of.

Here's what I sold him: 2003 WRX 6 disc changer. It worked perfect when I took it out of my car-- that was the first mod I did to the car was change the radio in it. as a matter of fact, I had one waiting on me at the house so I changed it right when I got home from the dealership. I'm not saying it couldn't gotten damaged in shipping transit, but I really want to try to rule other possibilities first. Any help or feedback would greatly be appreciated!

Anyways, my question is this: Can this radio work in a 99 RS or do modifications need to be made, and if so what? I don't know anything about the RS electrical system, but I am figuring it's quite similar.

Any expert knowledge would be wonderful!

Thanks in advance!

Greg