After cleaning my battery terminals I went to reset my radio security. My problem is that while the word "code" is supposed to show, I only see the letters "CO". If you try to enter the code number, the error message comes up.?????
I think you have locked it too much. Try removing the batery and re-doing the steps again.
Remember its the buttons 1 and 6 pressed together at the same time while you try to turn it on again.
Hope it helps!