Never had Motor Driven steps but figure this might help to troubleshoot your issue
unhook the motor and use a multimeter to test the voltage to the motor and see if it is getting any voltage.
Possibly a bad or blown fuse - if I remember correctly the fuse will be close to the motor or check your power / load center for a bad fuse.
2011 Rockwood Mini Lite 2306 - Matt
2004 Dodge Ram 1500 Qaud Cab 4x4 with 35" tires and 3.92 gears, Dynatech Longtube Headers & Fabtech 6" lift + Superchips with shift Tuning
Nights Camped 2011 (37) - 2012 (16)-2013 (2) -2014 (5) -2015(0)
USMC 91 - 95 - F/A-18 Aviation Ordnance