Well, i must be stupid. Can't get the passengers cabin light to work, at least from the exterior i dont see lights???

Have you checked the CDU menu to see if they're are set on (thats where you control them)?

Yep,Also via manual and 100% , but no lights...

You should submit a support ticket, there is someone else who has this trouble in another thread so you're not alone.

i now see what the problem is. I had the KLM livery loaded, no lights here, but in the default pmdg livery it works fine. So looks like the problem has something to do with the klm livery.....