You should have a switch labeled "Steps" on the control panel by the door.
It does what you are looking for.
Be sure your ignition is OFF.
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.