Do the cabin lights go off by themselves in the large campervan?

They will turn off in about 3 minutes after closing the door. You can manually turn them back on by manually flipping the switch at each light of the overhead light or flipping the switch on the light right above the front seats. If the doors are open it will take about 30 minutes for the cabin lights to turn off by themselves. Alternatively, you can manually switch them off. Most of the cabin lights also have there own individual switch.