seating

17:21 May 13, 2018 

Aha!

As usual, that does make it a lot clearer!

I'd interpret this as being 'filler block for seating the rubber seal' — apparently, to keep it in the right place so it can do its job properly.

16:52 May 13, 2018 

16:40 May 13, 2018 

"joint en caoutchouc de siège"?

I can hardly imagine a car seat that would need a rubber joint - what for? where exactly???

For all we know so far "seating" could be an operation / a task like "putting the rubber joints in position", especially if the part "On Shut Face Of Door" is to taken into account!

Or it could be a part of the door shaped to receive this rubber joint, or ....

You surely could keep guessing / let your imagination off the leash - might be an interesting mind game, but that's not leading to anything reliable.

Context?

16:25 May 13, 2018 

"d'appui" du joint en caoutchouc

16:08 May 13, 2018 

Here, it's not that kind of 'seat' — in EN, we never use 'seating' for 'a seat', except in the collective use, e.g. "seating for 120 people".

15:52 May 13, 2018 

joint en caoutchouc de siège