There is a lot of combined Kwikee help on here. What makes you think it is the control unit?
In my case, the steps would not move. I put my meter onto the motor leads and saw the unmistakable pulse from the control unit, then because they were unable to move, the control unit would trip off internally to avoid an overload.
When I released the bolts slightly that were holding the unit tight to the frame, that gave a little more clearance and presto, it worked. I put some shims under the bolts and never had another problem with it.