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Heated seats use a heating element which just needs power and ground. They can’t encrypt that.
Yes you can run your own wire and glue a switch to the console. But it won’t work in the car’s ui. And I bet everything over 5v for USB is off a computer controlled relay. So you’d have to patch into the high voltage battery and do your own dc to dc conversion.
Which would be really easy. Who cares about the UI?
