Recently somebody asked about their failing lumbar pump setup. Well, I've had these pictures lying around and just got around to scanning them this weekend. Here's the mystery "bag" tucked into a niche formed between the seat frame and the upholstery trim on my driver's seat. You're looking forward at the backrest from this perspective:
The bag contains the lumbar air pump, and as in typical over-the-top E31 fashion, consists of a handstitched upholstery material, complete with foam backing, tightly enclosing the pump for noise suppression purposes:
Here's what's inside. Pump supplies air, solenoid valve fires to deflate the lumbar cushion, and the switch prevents overpressuring the lumbar cushion and accidental blowouts. R&R consists of checking all the electrical connections and securing the hose connection to the outlet nipple of the pump body.
Pretty simple, but cool, nonetheless.
Mark
