Sony radio wiring

[PNYKLR]

My friend gave me a sony radio model xr c210 I know which are speakers (they were marked at the factory)

I also have red with black stripes(i assume power)
black with red stripes (ground)
blue with a red stripe (says ant rem)
blue with a white stripe ?????
light blue (marked tel mute)

I have the GM harness which has a red, blue, black and orange
as well as that little plug which I have no idea what it goes for
the kid who wired it for me ITS NOT IN THE CAR YET (whew)
didnt use that but I know its needed !

Please Help !!

Chris
94 Suburb
87 GN
85 Regal

any ideas??


Chris