Not familiar with the Mirada but on my Concord there is an override switch for the steps. If they are out you turn the switch off and they will stay out. Mine also has as safety override, if the steps are out and you turn the ignition on it will pull the steps in even if the switch has them locked in the down position.
According to the LCI website they do have an override sensor if they hit something.
I would think that Coachmen would have used a similar system on the Mirada.
FWIW my override switch is in the panel right by the stepwell.
All of the above is assuming you have the LCI Tread Lite Power Steps