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I'm not saying it's the radio either... your car is a 2011 so even if it's base audio system, it has an amplifier.. again this is just a guess based on what I've seen come in and out of the shop, but when those amplifiers fail, they make electronic high pitched noise come through the speakers even when radio is off, even when the whole car is off and locked.
There have been several issues where reprogramming the vehicle fixed strange audio problems.
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