IOD (ignition off draw) fuse. it goes to the radio to keep the time, last track played, radio stations, interior lights, power locks(if there),the odometer trip milage, not sure wut else it is "SUPPOSED" to be connected to. everything works fine if you take it out.
i dont have mine in becuase it gives power to my windows and wipers with the key off. but in key-on everything works as it should. sucks at night with out the lights but eh i go with out. if you let find out what the parasite is i'd like to kno as somewhere to look for on mine.