If you can open and close the door and then watch the orange step light underneath. IF that orange light goes ON and OFF when you open and close the door the step magnet switch is operating. IF it fails to either close or open and the orange light is going ON and OFF, HIT the motor with a hammer while opening and closing the door. IF the motor then operates, the motor has a dead spot on the armature and you need a new motor-----This is the most common problem with Kwikee steps for inop or intermittent step operation. Caused by lack or cleaning and lubing of the step linkages over the years. Doug