This is the toilet I installed:
As far as the steps are concerned, if the motor runs automatically when it the door opens, it must have something to do with the linkage that operates the steps. If you're lucky, it could be as simple as a missing screw or bolt.
If it doesn't run automatically but only when power is directly applied to the motor (making the steps operate), it likely has to do with the sensing/switching mechanism, wiring, etc.
There may be something here to help you with your steps:
I've found that using Google to search gets better results than Winnieowners' built-in search function using this format on your browser's address bar:
Hang in there, I bought my 2002 Suncruiser 35U in November and I'm still working on it and spending money. I'm getting new tires tomorrow.