Does replacing OEM head unit require dealer programming?

ArgentLA

Member
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2005 Mazda3s
Per my other post about audio problems, I am concerned that the stock head unit in my 2005 Mazda3s (non-BOSE) may be on its last legs. Here is my question: If I replace the head unit with another OEM HU, does the new unit have to be programmed by a dealer before it will work? (One online vendor I was looking at implied as much.) Or will the new unit just plug in and function, assuming I reinstall it correctly?
 

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