Here is the link to the manual
that came with our coach for our steps directly from Lippert's site.
The CSP wire is noted as Yellow on this diagram.
Our steps surely do not function the way the manual says they should as we cannot "lock" our steps in a retracted state no matter what I try. Not a big issue to me as I can just put a magnate next to the switch on the door if I want them out of the way for checking on my batteries but I can understand why it bothers others.
My theory with this wiring situation is that if the white and red wires were swapped such that the red wire went through the switch then the system would function as though the switch was in the on position all the time normally, however if the switch is turned off at ANY time it would immediately cut power to the motor and stop the steps in their tracks. I have not had time to try it out but might tomorrow. In this way you would close your door and after the steps were retracted, turn off the switch (which cuts power to the motor) and they will stay retracted (I hope). Once the switch was turned on and the door opened they would extend. Once extended turn the switch off again and they should stay extended. This is exactly the way the steps on our old rig functioned. The problem would then be that it would be possible to drive off with the steps extended as you are actually cutting power to the motor and if left out with the switch off they would remain that way even with the ignition on.