Please let us know the year, make and model of you RV.
If you have information about the make of your steps that might help, also.
And if you can't turn the lights on or off, I'm guessing your mean they don't at all and when you say the steps can't be turned on or off do you mean the step lights or that the steps cannot be extended or retracted?
Thanks and welcome to the forum.
2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.