I changed the battery in my VW Jetta and when I turned the car on it asked for a pin code for radio and navigation system. I entered the wrong code once and then looked in the owner's manual and found the code 1203 and tried to enter it and it said incorrect and locked up the system. What can I do to unlock the system? My system s/n is VWZ1Z7E5532981.. Can someone please help! I am unemployed and the dealer wants a $55 diagnostic fee which I don't have, to reset my system. HELP!