"That's the Engine Control Unit."
Not to get too far OT, but....
There's another control unit that deploys the airbag in a crash contains an Event Data Recorder. That records many things like speed, direction of travel, when the brakes were applied, throttle position, along with many other things. It also contains a GPS that can give your location to render help in the event of a crash in some cases. Travel can't be traced though because when a crash occurs, the EDV is activated and records roughly 30 seconds before the crash happened, so it's only recording in a loop and then erased until a crash happens. After the crash, that data is then stored and it takes special tools to retrieve the data. Some states won't allow LE to access the data unless it's a fatal accident.