1. Yes it will affect Onstar. You can either move the whole OEM head unit or there is a board in the head unit that can be pulled. There also are companies that make interfaces to keep the onstar just like to keep the steering wheel controls. Do a search for PAC interfaces on the forum. They are also working on a interface to add a aux input (XM, DVD, Etc.) to the OEM head unit.
2. Shouldn't as long as OEM head unit is left installed
3. Shouldn't bother the Steering wheel controls but they won't control the XM unit.
4. Don't know how hard this is but shouldn't be a problem for an experienced installer used to working on GM autos.
03 Black Adventure with all Lux Options and Brush Guard Lights. Go Vols!!!
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03 Black Adventure with all Lux Options,Brush Guard Lights, Sylvania Silverstars, I-Pod via PAC Device. Go Vols!!!
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