Quote Originally Posted by BanginJimmy
An 03 Cavalier requires the insanely expensive GMOS-01 harness. I really dont want to pay more than $100 for the harness so what would be the easiest way to bypass it? From the little I know about it, the only thing I will lose is the door chimes and I wouldnt mind losing those anyways.

I havent ripped the dash apart yet so I'm not sure what the wiring behind it looks like but I would imagine I could just cut the stock wiring harness off and simply hardwire the new harness in, is that correct? If so, can someone check shopkey for me and let me know the wire colors for the 12v constant, illumination, accessory and speaker wires?
You can get the Axxess XSVI-2003 to retain the power functions...it is cheap. Then just tap into the other wires. I would tap into the wires instead of removing the factory harness. Cheapest route would be to tap them all.

Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger: Pink
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue