Radios go into this mode when the code entered was not correct - if memory serves there will be a specific time period you are forced to wait, probably with the ignition on, so plan for it on a long trip. I think its about an hour for every incorrect entry so entering incorrect codes will really try your patience after a few days of it and I certainly wouldn't last long.
I'm sure I won't be the first to suggest that if your car was bought used, there is a small possibility the stereo is not the one originally installed in the car if the code provided with the car is not working?
Being completely ignorant about radio/cd appliances, what happens with the original Fiat fascia/buttons if the standard unit is changed for an aftermarket item? Thanks in advance for any help.
Thanks Charlie, but what I meant was can the original Fiat audio controls on the dashboard/front of the unit still be used or would an aftermarket unit have to use whatever it comes with and therefore make the dash look a bit of a mess? Sorry if this sounds stupid on my part but it's not something I've ever had to do! Next stop Halfords or similar, probably!