I just did this a month or so ago and it was a pain.
Things I lost.
- RAP for the aftermarket unit only...my DIC stays on until door opens.
- Its not as clean as a factory install but looks great in person. (take your time on cutting yours out thats what makes or breaks it)
- Im not sure on OnStar, XM, or that stuff since I dont and have never used it.
Things I retained.
- DIC
- I can fade from front to back and left to right
- I can adjust the bass treble and mids via the stock DIC like normal.
- My steering wheel 1-4 buttons are programmable as well as the volume works.
- I can use the stock radio knobs....actually I turned my aftermarket DIN all the way up and control the volume with the stock knobs and steering wheel control.
Things I lost.
- RAP for the aftermarket unit only...my DIC stays on until door opens.
- Its not as clean as a factory install but looks great in person. (take your time on cutting yours out thats what makes or breaks it)
- Im not sure on OnStar, XM, or that stuff since I dont and have never used it.
Things I retained.
- DIC
- I can fade from front to back and left to right
- I can adjust the bass treble and mids via the stock DIC like normal.
- My steering wheel 1-4 buttons are programmable as well as the volume works.
- I can use the stock radio knobs....actually I turned my aftermarket DIN all the way up and control the volume with the stock knobs and steering wheel control.