what started as a "what does this wire go to?" Ended up with me disassembling an aftermarket DVD player the prior owners installed. When I took off the bottom panel on drivers side and found 4 harnesses. 2 go to the R/L vent windows and 1 goes to the mirror switch. However I have no clue what the other one goes to (on the left). I don't have a R Diff. Any ideas or how I can find out?