Update
There appear to be FOUR colour schemes possible on the BMW Mk-IV DVD System. Changing the colours in them affects everything (main menu, phone menu, etc)
Colour Set 1
Split rom_col_1
Fullscreen rom_col_10 (not yet confirmed, but it can't be any of the others as I've ruled them out)
Colour Set 2
Split rom_col_3
Fullscreen rom_col_2
Still yet to find
- colour for text labels for highway icons, streets, parks, lakes, etc
- colour for
My guess is that these are in rom_col_10
More testing.
I've already created a darker version of the 'Brown Theme' - including the map & main menus

It is still in the testing stage. Attached are photos - same exposure, same brightness settings.
Paul Martin
Australia