First off, what Brand of steps do you have? What year is your rig.
If they are Kwikee, you're in luck because there are an untold posts on what to check. If you do not have a DMM or an AMM use a test light and follow the trouble shooting instructions to find the problem.
If you do not have a manual, search for Kwikee Manual #888 or PM me and I forward you a PDF copy of the manual.
The Kwikee steps are simple, in MNTBHO, the new owner screwed up a great product. I know nothing about the new steps and don't care to unless I win the Lotto and buy a new coach.
David