It may be showing ERR due to wrong code input too many times in which case try leaving the key on ACC , system on till it clears and CODE comes up. It may take a few hours. When it comes up with CODE, enter the code you have. If it doesnt come on after the first attempt at inputing the code, you have the wrong code, a ford dealer should be able to supply the correct one. If this doesn't work, you have a 'scrambled' CPU, a good radio tech should be able to sort it for you. You will still need the correct code, though some techs can get to the EEPROM part of the cpu and set the code to nil or whatever you want. These systems are fairly unreliable, lots of dry joints, leaking caps etc.
