Quote:
Originally Posted by Tcoat
It isn't a surprise. Most HUs retain all of the presets. It isn't like they are still powered when you shut the car off.
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Most aftermarket units have an always on 12V and an ignition switched 12V. The wire harness in almost all cars still have both. It’s only fairly recent that most radios actually retain information after a battery swap, it’s probably only been 10 years or so.