I'm replacing the crappy factory with an aftermarket one.
Could someone help me decipher what all these wires are used for?

 

I figures it out, thanks for all the help �� it was a piece of cake though with a Metra harness and volt meter.

 

You shouldn't need to figure out what anything is? If you have a radio harness adapter those are color-coded to match the harness that plugs into the back of the new head unit

 

You're right. This before the radio came that I ordered. I didn't think the wires would match, it was super easy. I checked it out with a volt meter just to make sure.

 

Ah, yea that screwed me up the first time to. I was like "how the hell am I supposed to know which wires on my harness go where so that I can connect them to this stupid headunit connector.

Then later it all clicked...haha