A trap control box is a device that is usually connected to downer detectors. If a polarity device is used on it it will appear purple, and will reverse the effects of whatever device it is connected to. On the other hand, using a clever trap tool will disable the trap it is connected to. Some trap control boxes may be locked and will require a basic lockpick to open.
Trap control boxes can be found near a downer detector They are usually connected by a wire which can be followew to find the trap or the trap controls box.