A modern LED light replaces the standard & small car lights in the back of the campervan to illuminate the campervan at night. So no worries if you think the small cabin lights don't work. These have been disabled as the modern LED light replaces these small lights.

How does the LED light in the cabin work? A good question with an easy answer. Turning the interior LED light on or off is an easy yet subtle process. There isn’t an oldskool switch, but there is a touch-switch on the LED light itself. The small dent/notch on the light is the switch. Touch it gently and the light will go on or off. 

See this how-to video for more info about using the interior LED light - all Spaceships campervans have the same interior LED light system. It starts at the end of the set-up of the bed segment and right before the awning demonstration, see the timeline of the video for chapters and their name.