I too having similar problem with car radio it's not asking for code but not picking up stations?

It shows the radio station number but doesn't tune into it I've tried all sorts you can her it searching for station but just doesn' find it. Tried menu button TA settings even manually. It did work just recently bought car haven't got manual I think I pressed something & lost channels. It's RDS 5000 ford ka radio any suggestions?

Your radio's Owners manual:
http://www.nxp.com/documents/application_note/AN96029.pdf

Perhaps the aerial (antenna) is faulty

Check to make sure the connector has not fell out of the back of the radio