It took me a month or so to figure out this problem in our Bounder. don't know it yours is same but I will pass it on as it is not intuitive IMHO!
It started out with me trying to turn on the lights in the base of the bed over the captains chairs! When I brought the bed down there was a light switch accessible from the bed, but it only tuned on the lights in the ceiling over the bed.
Eventually I noted in a row of switched down a floor level at the entry door there was a switch marked ceiling light! When the bed is up it turns on the lights in the base of the bed. If you lower the bed those lights turn off and the ceiling lights come on and can be controlled by the switch accessible from the bed!
You may have a ceiling light switch somewhere you have not yet noted! Good luck!