04 Tblazer Radio

Does anyone know if I replace my stock radio with a pioneer head unit will the steering wheel controls and rear stereo controls still work.

You can replace your radio but if you have onstar you need a special adapter to make it work, onstar is somehow built into the radio. You can get a special adapter to keep your steering wheel controls but there is nothing to use the rear seat audio that I know of. Check out logjamelectronics.com they have a whole lineup of things to work with factory radios.

gmos-01 is the adapter you would need if you ever replace the factory radio with after unit this unit ensures that all your options that are programed into the radio still work (onstar, bose, chime, dome, and many more as for the steering module its may by P.A.C. but will only work if the new unit has a ir remote eye.