this happened on my focus 6000 radio/cd,the memory has gone ,if you make the mistake and take the unit out to see if it is the arial is working you might find, like i did that the code does not activate if you disconect the power lead .so i purchased a sony cd /radio rather pay around 60 to 70 pound for a second hand unit that might give me the same problem i am going to throw my old unit away.
steven blood, December 2007