It will have locked you out now. Every time you put a wrong code in or enter the right code incorrectly it locks you out for ever increasing time scales. You have to leave the radio on for a long time until the code entry comes up againg. This can be DAYS of constant power, i.e. you cant switch off! I've rigged a system up to run from a battrey charger in the past using a ford radio connector from a scrap yard Ford. In worst case scenario You have to take it to have it reprogrammed. If you're not sure of your code but have the serial number you can buy a disc for PC from eBay for about £1.99 which has loads of diferrent makes of radio codes.
Richard T
February 2009