Well, start with the chassis battery, make sure it's charged. As mentioned, the fuses are always good to check. Take a volt meter and check if there is power at the step motor. Remember! The position of your door is important for this one. When was the last time you lubricated the steps. They can freeze if the joints are not lubricated. Take the pin out that connects the motor to the steps. Careful! Secure the steps. They can hurt you. If the motor works once disconnected from the steps, you need to get the grease out. Something like Dry PTFE Lubricating Spray.
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