Just collected my Punto Active '03 model.....at switching on the radio, the display shows 'CHECK' and does not prompt Code entry. the radio/cassette unit is the original and does not appear to be a replacement. I have the original card which shows the serial number and the radio code. I also disconnected the battery to see if it prompts the Code entry but it still shows 'CHECK' on display........any ideas?

......solved! Pulled out the Unit, one of the 2 loom connectors was dangling loose, pushed it back in and the Radio works fine! "CHECK" literally means what it says....