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According to the manual, they are both powered all the time. I would assume the same exact thing you are saying, that the driver's side is on wake-up over LIN which in turn sends wake-up over UART to passenger side.
From the small exposure I've had to it, LIN is standardized just like UART. There are different ways to compose a message but none of it is going to be proprietary like the CANBUS. It seems to me the easiest thing would be to piggy back on that LIN line like what you said, and reproduce the correct message. It would take an afternoon with an o-scope, but it wouldn't be very difficult.
-Acree
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