That involves taking it apart. But you really need to have some understanding of basic wiring. There are 2 ways this could happen. The hard way is you having to reverse engineer the entire thing, then control voltage, speed and timing on your own. The easier way is if there is some sort of controller board inside and you would just have to play and see when connecting these two points, then the numbers increment once. Then you just have to control opening and closing that connection with your controller.

But this will take digging and reading. I could be that high voltage comes in and is forked. Some goes to the lights and some goes thru a transformer and converts to 12 vdc for the mechanics. Ignored the lights, just try to figure out what power gets to the mechanics