Hi guys! first of all, sorry for the language. I´m not speak german.
For the mod, we need a Insignia/Meriva/Astra... roof console (with map lights, obviously) like that:
[Blockierte Grafik: https://www.picclickimg.com/d/l400/pict/153015633664_/Vauxhall-Opel-Astra-Mk6-J-Interior-Roof-Light.jpg]
The new roof console has tree lighs, much better thant just one. When I bought it, I thought that gray is the same in all opel cars and I just need to solve the electrical part. My mistake 
. That is why, to continue with the gray of my Adam, this tutorial adapts the lighting of all the lights from the central control (If the color is not a problem, updating the wiring, all the buttons can work without problems 
).
Pics before console upgrade (* pics shooted in manual with the same params
[Blockierte Grafik: https://i.ibb.co/D550YfJ/photo-2019-04-20-19-33-26.jpg]
Pics after console upgrade (* pics shooted in manual with the same params
[Blockierte Grafik: https://i.ibb.co/55Z2SCT/photo-2019-04-20-19-33-34.jpg]
[Blockierte Grafik: https://i.ibb.co/4Mngnst/photo-2019-04-20-19-33-37.jpg]
Ok, let's compare to be able to adapt it, On the top, the "new". Down, the one installed in our Adam.
[Blockierte Grafik: https://i.ibb.co/98jnqQP/photo-2019-04-20-19-43-31.jpg]
[Blockierte Grafik: https://i.ibb.co/30HgysZ/photo-2019-04-20-19-43-36.jpg]
The blue and black lane is not installed in our Adam. The black lane controls the red led of our new light (battery on). The blue lane allows independent operation of the courtesy lights (with the buttons that we are going to suppress 
)
[Blockierte Grafik: https://i.ibb.co/6DqNqqj/photo-2019-04-20-19-43-41.jpg]
[Blockierte Grafik: https://i.ibb.co/FVL61Ty/photo-2019-04-20-19-43-55.jpg]
To suppress the buttons, we will weld or we will connect tracks on the yellow points, now all the lights are controlled from the central button.
[Blockierte Grafik: https://i.ibb.co/6brSY4R/photo-2019-04-20-20-00-38.jpg]
Finally, we use the plastics of our Adam to hide the buttons of courtesy, do not worry, it is plug & play, in this way we keep the original gray.
Cheers from Spain. 