I bought a 89 Supra Turbo just over three years ago, and I've not had the radio working since then. I bought the car from a lady who had inherited it from her father and it hadn't moved in two years. I took it to the local Toyota dealership and they told me they wanted 100$ to look at it and 50$ to fix it on top of that and were quite rude about me questioning the price. Long story short, they did not get my business. I also didn't want to replace the radio.
I've seen several posts on several forums regarding the code "108431" as the master unlock code. This however did not work for me. After finally resuming my search for a fix today I found another forum that has a big long sheet of codes and I was finally able to unlock my stereo. I've never been happier. I thought I would post the link here for others. I don't know what models and year's everything covers but just look up your radio model number.
http://forum.ih8mud.com/threads/ster...y-code.377166/