On my 2005 Four Winds, there was a DC circuit breaker that was tripped that prevented my step from operating (I believe). The breaker was located in plain view underneath the foot of the bed near the fuse panel/converter. A small black pin was protruding from the breaker, and while troubleshooting, I reset that pin. I was working on fixing several loose wiring issues, so I am assuming that this breaker was the culprit on the nonworking step.
I also discovered that the step has a manual override that would require an adjustable wrench to put on the square shaft. Presumably, that shaft turns the gearbox, which operates the step.