Was installing my HID fogs the other day and while snooping around the engine I saw this "box" located just above the cooling fan that I am not sure what it is for. Also, it has a connector on one end with nothing connected to it. Anyone know what this is and if it should have something plugged into it?? (I know, I know, I need to clean the engine bay)

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!