Something else that I thought of - the previous owner hardwired a Bluetooth audio receiver to the center console aux-in (for streaming music from phone, car has OEM phone Bluetooth).
Hearing how finicky the seat wiring is, I am wondering if where this Bluetooth device is tapping power from is contributing to this issue. I read in another thread a user had a seat heater issue caused by tapping a fuse for a radar detector.
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