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aftermarket stereo

  1. Steering Wheel Control buttons changing functions

    Car Audio/Alarms/UConnect/Navigation
    Hi Everybody, I'm not entirely sure how to word this, let alone search for it, so forgive me if it's a common issue. Couple years back, I had an aftermarket Pioneer deck with a PAC SWI-PS and C2R-CHY4 installed in my 2005 300c. Over the years, the function of the steerwheel controls has...