Can you get a picture of the vent that you are talking about and we will know for sure but more than likely that is the air intake for the rear HVAC system. I attached the drawing below of what I suspect you are referring too. Let me know if it is something different.
As for the wiring that goes into the sliding door, it uses a harness that will actually move slightly in a rolling fashion as you move the door. Take a look at the second picture and you will see how it bends and this is what moves as the door moves.
Let us know if you have other questions on this. Thanks
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Tuesday, February 16th, 2021 AT 9:38 AM