The knob pulls on a cable that either pulls or relaxes the supports in the seat.
To start off, you can try to remove the side panel from the seat and see if the knob and cable are still working. Otherwise you'll have to remove the cloth/leather from the seatback in order to access the supports.
_________________ 2002 Galaxy Silver Sedan - LS cluster - Debadged - Intrigue compass/autodim mirror - DIC - Regal graphite leather seats - LS console with floor shift conversion - Monte Carlo black leather steering wheel - LS springs - KYB GR-2 Struts - GMPP sway bars and rear STB - Fog light frontend harness - LS Bumper with fog lights - Painted trim and side skirts
2006 Nissan Murano - Autodim/compass mirror
2006 Mercedez-Benz E350 - Stock for stock, its faster than an SS, woot!
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