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There's lot of choices for MCU's with LIN, CAN, and UART hardware ports/lines on-chip. Attaching hardware to the bus is not the difficult part, it's the proprietary protocols Toyota/Subaru use on these lines - that's the hard part. I don't have this level of tooling (time?) to reverse engineer the protocols - but if you have ideas like to hear them!
If we have choices and can stay off the CAN and LIN bus, that'd be the way to go.
The UART is a bit different story. It's dedicated and point to point only between the doors, and probably carries very few messages, I'm willing to tackle that one. Can likely sniff, capture, and replay a packet to get passenger window to go up/down on command.
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