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bq-
Does your built-in lumbar function actually still work? I seem to recall it was a bit breaky
Now that's a good question. The drivers and the passengers side are the same, insofar as my highly scientific "fiddle with it at traffic lights" based testing can reveal. The chairs have a lumbar bladder, and it can be moved up and down, but at its lowest it's in the lower 1/3rd of my thoracic spine.
What's confusing is that the massage function does start at the base of the lumbar spine, which suggests that something is broken. But on both chairs?
Dammit
I may have fixed my E63 seat- with a rolled up wheel bag. Said item provided the lumbar support that the (expensive, optional extra on an already expensive luxury car) simply don’t have. I have now ordered a £15 lumbar pillow from Amazon to see if that resolves it completely, and if it does I’ll have the seat modified properly.