You need the TV screen out to be able to view the diagnostics, and I am not sure this will be possible on every car, mines an 03 on a 53 plate.
Quite simply, the back and enter button on your steering wheel need to be pressed, I think it is back then enter and repeat possible 3 times as you first turn the ignition on, although I have not counted yet to establish how many times i just keeping mashing them until it comes on, then the screen will display the diagnostics. However, if your screen does not come up, then you wont see anything.
Have you checked the fuses in the boot above the DVD player?
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