There are two step switches, one is a rocker switch, usually by the door that says extend/retract. The other switch is magnetic and usually at the bottom corner opposite the hinge, if the magnet comes off the door won't work properly. The magnet is usually stuck on with double sided tape. Not sure where your fuses might be but I would check those next. If the door is closed and the ignition is turned to run the step will retract, if not you don't have power. Bend down and see if you have any loose or broken wires.
Beyond those things you either have a bad control board, bad motor, or less likely a bad gear box. Let us know what you find.
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