Ok there are TWO answers depending on the age of the Stepcontroller
This is for KWIKE steps (Whatever they are called today) the controller is under the part of the step that attaches to the motor home if it is a RETANGLE than it's old..
The new one looks triangular (really a trapizoid but hey Let's not pic nits)
The new one.. When the door is closed normally a magnet in the screen door closes a magnetic reed switch. IF the steps are not "Locked" then they retract
IF they are "Locked" Then they stay out unless you start the engine then they still retract (Engine overrides lock) only they may not retract fully so do not trust the ignition override.
THe "Step switch" in this configuration si called an OVERRIDE switch but you can call it the lock.
THe old one the reed switch is normally closed the door magnet opens it and the steps retract (Can't use the same switch now) The switch is called a POWER switch and from what I know locks both in and out.. Again Ignition overrides out.
NOW.. Find the fuse box. On my rig it's the Intelletec Battery Control Center box (yours may not have one of those but if it does YIPPPIE) in this box are a number of 5 amp fuses. ONE of them is dedicated to that "override" switch.
Suspect #1
Suspect #2 is the switch itself
Does it light? If not.. cycle it several times with batteries DISconnected and no shore or generator power Try again with batteries connected if it lights and steps work well You fixed it. Believe it or not.
After that I'd check the multi-pin connector near the controller. Unplug and re-conenct a few times
After that $$$$$$$$$$$$
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times