I recently purchased a 2015 MXT 303 and have 2 switches that I can't figure out what they operate. The switches are mounted vertically on the cabinet above the sink. They are between the microwave and OH kitchen cabinet. There are 5 switches mounted horizontally under the cabinet. These operate the slide, awning, awning light strip, outside "porch" light, and main lights in the living quarters. Any help, even, what else they might operate that I should check would be greatly appreciated. There are lights on the front and rear outside, but these are operated by a switch on the lights.
I have a 2015 MXT 319 and I agree that KZ does not know how to label switches on these trailers. I had to make some labels myself and put on mine. I did a search for 303 on the internet and found one with 2 switches together and they were actually labelled as outside speakers. Give that a try and see if that is it.