AFAIK its the green/white wire for the +12v for backup camera.

Trying to figure out the easiest way to get wires for backup cam from the trunk to the stereo. I dont have have wire coathangers so i dunno how i can fish the wire under the carpet. I was thinking just drilling and running it under the car exterior.

I got wireless adapters as a backup solution but i hear they arent that good.

 

remove side trim, fold carpet back from door sills, run wire, reinstall.