I have a 2007 Bounder. It actually has 4 switches in the bathroom. The main ceiling light, water pump, & the powered vent. The 4th one is to a small nightlight very close to the floor, similar to a license plate light on the bumper of a vehicle.
I just purchased this MH in November 2015. I'm still discovering and figuring out the "mysteries" of it. It' sort of fun though.
For instance, there's a cluster of switches on the dash area just ahead of the co-pilot seat, labeled compartment, entry step, porch, ceiling lights. Pretty obvious what these switches control. But, none of the bay lights worked on the left side, except the ones in the bay under the slide. I discovered the "utility" switch on the left side of the drivers seat actually turned all these lights on, hence "utility", these are bays with the elec, water, sewer, and the light in the rear at the radiator. Had one of those "ah-ha" moments when I figured this out.