My 04 headunit has 2 plugs in the back 1 big plug and 1 small plug. I relaced that unit with an 08 head unit. The issue is that the small plug on my 04 has wires that plugged into it I do not know what those are for. I am hoping that they are not critical to anything because my 08 needs that small jack for the sirius unit. Can someone tell me what those wires are for (I hope they do not need a home)