No-one has ever found out what its for.......though some think its Maseratis way of tracking all errant 3200 drivers.....................................................
is there a little vent next to or around it? if so id say its the little fan that draws in air to take the temp and helps with the aircon.. the little led is attached to the fan and "lights" up when the fan is working although it rarely works like that.
if not then i duno lol