Model X EPC shows all trim having light and version 1 of the complete tilt motor mechanism. Model S EPC shows the IP trim having light but none in the door trims. It originally showed the version 1 tilt mechanism with no motors, and now shows a version 2 mechanism with new kinds of motors. Despite differences in the catalog drawings, the mechanism assembly has always had the same part number between both the S and X (1607360-00-E). In reality, only one Plaid I've seen out of five has had lights in the IP trim. It also had lights in the door trims. The other four had no trim lights at all. I have yet to inspect a Palladium X.
Confused? So am I. Palladium production has clearly been a complete mess. Yesterday I went to a service center and attempted to order one of the new mechanisms. I say attempted because as I previously noted, they've all had the same part number, and the part example pictures the technician brought up were pictures of the v1 bracket with and without motors. I explained the situation to him and showed him the drawing differences which confused him as well. So the order has been made, and if the part does not match the latest drawing in the S catalog, he'll run it up the chain and inquire as to what's going on with the version control.
As far as retrofits, I have virtually no clue. So far I have yet to actually see a motorized mechanism in person - just drawings and pictures from old service manuals. Once it's confirmed motorized mechanisms are in delivered cars, we can assume Tesla will be adding first party function support, and retrofits - official or unofficial - would be practicality guaranteed.
And for anyone curious as to what the trim lighting is supposed to look like:
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Acrylic light bars with light engines affixed at the ends. The light engines contain a LIN driven RGB LED. I see nothing wrong with the design so my complete guess is these were a victim of the chip shortage, but again they're present in the Palladium X catalog so they may be coming back. The corresponding connectors have been present in every S I've inspected and the connectors are powered. In this particular Plaid, the light engines are likely just not receiving any commands.