Section 131 (Power Seat System): Lumbar: Description
WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Some vehicles are equipped with a mechanical lumbar support mechanism (1). The only visible evidence of this option is the separate lumbar control lever that is located on the inboard seat cushion side shield. The lumbar adjuster (1) and cable (2) are concealed beneath the seat back trim cover and padding, where they are secured to the seat back frame.