wiring relay in trunk floor

[s_jo4]

while i was in the trunk and had the carpet pulled back to access the pump i noticed that there was another relay of some sort back there. i checked the books and couldn't find anything in that location, it has like 5 wires coming in and nothing going out. the closest thing i could find was for brakes or wheels one, i forget, but just wanted to know if anybody else had that in their trunk. (01 gtp)