Breaking Ground. Robotic parts are controlled by controllers even after separation, and when no probe core is attached.
Basically the title, but that wouldn't make sense because they are two separate craft. Even after separating parts the robotic parts still respond to the controller.
Take any craft with control, and put a separator or decoupler on it, and put robotic parts and power on it, but no control.
Put a controller on the main part of the craft and make it move the robotic parts on the decoupler.
Go to launchpad/runway, play the controller once, then detach the parts. Then reverse the controller. The robotic parts on the separated craft move.