View attachment 909072
I am borrowing someone else's pic for this, thanks in advance.
My driver's seat squeak every now and then too... it wasn't too bad, but it was still annoying. Thanks to this thread I was able to pop off the back seat cover.
To my surprise, all grommets were NOT loose. However I did notice the right steel bar (marked by red arrow) was the one making the squeaking noise. If I tugged on it, the noise appeared. Nothing at all on the left side steel bar.
After some trial and error the solution turned out to be quite silly and simple: I inserted a little bit of paper towel in between the yellow lumbar support device and the actual seat foam (marked by green arrow). That did the trick for me.
I think the logic is: the steel bar squeaked if enough weight is pressed onto the back seat foam, passing that pressure onto the steel bar and hence the squeak. By inserting the paper towel, it creates just enough gap such that when the same weight is pressed onto the back seat foam, it is not enough to disturb the steel bar.
It's still only Day 2 of the fix, but fingers crossed it holds up. I hope this helps!
PS: I also sprayed some WD40 upwards into the bar... I genuinely don't think it helps, but full disclaimer just in case.
PPS: I have tested the lumbar support function and it still works as normal.