Did some googling, and I think I solved 2 out of 3 issues. Doesnt seem like I can edit my original post so here is some info for anyone else that comes across this.
I came across a few posts on reddit and on these forums where people's fold seat buttons stopped working after getting their power port serviced, and in all cases the tech forgot to plug in the cable that goes to those buttons. Well, I didnt have power port serviced, but had that quarter window I mentioned replaced. So I decided to check.. and YUP! Back in December tech never plugged in the wire, I just never noticed since I never use them. Super easy to access the challenging part was fishing out the wire that was now dangling down deep in the side panel cavity. I wonder if this will also get rid of myserious rattling sound that appeared within last few months (maybe cable banging about inside).
Here is how you access it:
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The cable clips into the slot, so no way it fell out of its own. It was definitely tech forgetting to plug it back in after removing the panel to put in the window.
So that issue is resolved.
Then I looked under the seat and found the sensor wires, they look like this:
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The sensor is in the seat's foam and is the ribbon cable (red) coming out of the hole (green). It then goes into a little box and gets converted to standard wire (orange), which then goes into a clip (purple), the other side of the clip (blue) connects to the main thick wire harness seen in the center of the image.
I didnt want to unclip the clip or mess with any of that, so instead I pushed the clip together with my fingers, and also stuck my finger into the hole (green) to feel the sensor inside (ive read reports of them being displaced although they are supposed to be glued to the foam). I moved it around a bit.
After doing that the sensor seems to be working flawlessly.
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So for now I cancelled the appointment. Although I am still not sure what that APP_w303_imulrational error means. Ive read that its caused by sensors in various parts of the car not agreeing and can be triggered by wild driving (acceleation/stopping). While I didnt do any wild driving, the car did as I describe suddenly throw car into Park, essentially slamming on the brakes due to the faulty seat weight sensor when I was backing out of the garage.
That error is not present outside of service screen and Autopilot works no problem. Ill drive around for a bit to see if it clears. If not maybe then schedule the appointment. Will also allow me to test out reliability of the seat sensor.
For reference, the seat has sort of like 3 sections, the sensor is in the middle one. I am able to trigger it by pressing with my hand on that middle section
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