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I have the non-Bose single CD in my 08. I also have Onstar.
After my Pioneer install I get a buzzing through the front speakers while in back I get sound.
I bought the PAC OS2C (non Bose/Onstar), should I have got the Bose one instead?
I guess I should add that I have not hooked up any muting yet, maybe that makes a difference?
Are you sure you have a good ground? Not sure about the muting, sounds like you may have a bad connection to the front speakers I would double check everything.
Also try the AVIC forum there is great info there just do a search and you will find it.
Anybody? Car is torn apart...May need to go a different route here or put the stocker back in.
I did test my HU and its fine. Grounds are good. Im guessing I have the wrong or a defective interface?....
I did have to swap out my interface and I do believe that I used the Bose, you said you got your interface from Dennis at Double D correct, if so I would call him on Wednesday he is the expert and if you do have a bad one he will swap it out for you I am sure..