Steps may be a CHASSIS or HOUSE system, if HOUSE you will need to be inside, door closed, and then disconnect batteries, not always easy.
Alternative.. The Magnetic Reed switch is usually at the lower edge on the "latch" side of the screen door, the magnet (you can test with any feromagnetic metal) is in the lower "outer" corner of the screen, on the side, not bottom (a key that is attracted to a magnet will find it, or a compass)
A small magnet (Radio shack sells small magnets) or a Refrigerator magnet, or .. well I have a 25 pound "Fishing" magnet Will operate the switch, retract the steps, while you disconnect..
IF they are a HOUSE system, they will stay in
On my coach: FIrst there are two differen QUIKEE controllers One the switch follows the door (Door closed switch closed) the other is opposite the door (Door closed switch open).. Mine is the first
I wired a toggle switch across the magnetic reed switch. I flip the toggle and the controller THINKS the Door is closed.
Home is where I park it!