Needs help with wiring a radio.
 

So i just bought a Kenwood DDX318 radio from crutchfield and they gave very good instructions until it got down to wiring.
iv got the GM VT-GMOS-04 kit, GM dash kit, and the GM antenna adapter.
This is my first time with this sort of stuff so even the basic help is appreciated.

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So what's your question?

the wires are all basically labeled, so what are you asking?

Well i cant match up some of the labeled wires because the colors dont match the wires coming from the harness and Interface. And i cant seem to find anything that tells me what the wires coming from the Interface do.

Problem-
I cant seem to figure out where the steering wheel remote imput connects to in the harness. I would like to retain that ability.

There is a green wire and a green(purple) wire coming from the interface that i have also no clue where they connect

I cant find where the pwk SW wire connects to in the harness either. (On the radio it has a female end, but they gave me a single wire with one side that has the male end)

One of those green wires is the parking break wire. Probably the all green one. You can run a relay with it so you can watch movies while driving. Or music videos.