Hi all

I have a 1999 E39 with nav and tv. At the weekend I upgraded the nav with a Mk4 unit and a 16:9 screen.

All works OK apart from the screen is showing a 4:3 image in the centre of the 16:9 screen for all functions - nav, phone radio, computer etc. The only 16:9 image is the splash screen, but when I turn the ignition key it reverts to 4:3. I've upgraded the software to the 4/100 version but no joy. There is no option in settings to select 16:9.

I read on an old topic that this may be because my TV tuner (original 1999 unit) is only 4:3, and TV tuner overrides the 16:9 signal from the Mk4. Is this true?

If so I'm pretty hacked off. I've already spent a fortune on the Mk4 and wide screen. I don't want to have to fork out for a 16:9 TV tuner as well (I don't even care about TV functionality!).

Is there a way I can change the wiring to bypass the TV tuner?

Any advice or suggestions appreciated.