The Door Controller Unit is an object found in the Ice Hive on the planet Arcterra. It is used the Vault Door. Before Samus can use it however, she must reactivate various Energy Routers and destroy Barbed War Wasp hives. Once Samus does this, the Controller Unit will activate and Samus can Scan the Unit to lower the door, opening up the rest of the Ice Hive for furher exploration.
"Vault door controls are operational."