check the steps "on/off" switch for the simplest problem it be. other than that, if you are good with a test meter, the manufacturer has a detailed test procedure on their site. If it is the module, it is simple to replace. but check all your wiring and switches. Be very careful while under the steps and dont get anything you dont want cut in two near the steps, should they cycle while you are testing.
I had to replace the module and motor on mine, Jayco sent me the parts and I did the repair.