Help Please..

[Rio Yaris]

Hi Guys ,Im new here only had car 1 week..
Im always bit by the mod bug lol so today Im installing a rockford fazgate 10" sub and amp..did tint and leds yesterday,rims /tires/lowering next week..
anyways I need help please,,anyone know the wiring for the rear speakers?? there rear speaker plug on the head unit has 5 wires red/white/yellow/black and green is the odd wire out.. anyone know whats what?? right + & - left + & - and whats the 5th wire? Im trying to get a signal to my amp for the sub..

any idea what the correct wire hookup would be for a mono sub set up to the oem speaker wires as well?

any help is much appreciated guys