So quick question. My 2013 has the wire for a factory sub under the back seat. I got a factory sub out of a truck at a junk yard and it plugged right in, however its not working. I googled around a bit and saw that that connetion may be dead as it didnt come with the sub. I have the small base radio in there now. I’m assuming it needs an amp (factory) but i dont know where it is to look for it or even if I have one. Any help would be appreciated! TIA!