Hi, I was locked out of a radio some while ago and went to the main dealers to find out how to unlock it, as it happened I started chatting to a shady looking character in the que and he told me how to do it. What he said was this... Turn the ignition on and switch on the radio, leave the ignition on for about 30 minutes without starting the car or doing anything else to the radio. after time is up, switch the ignition off and back on again and hey presto unlocked. That was for a ford radio. I have also heard that if you remove the radio from the car, bag it and place it in the freezer for a few hours, this also works but I have not tried that way. Regards....