2003 Cadillac DeVille Owner's Manual - Page 15

Rear Seats Power Lumbar Your vehicle may be equipped with four-way lumbar support, without the massage feature, for the outboard rear seating positions. The rear lumbar support controls are located on the rear door trim panels. To activate the rear lumbar support feature, push forward on the control to increase support or rearward to decrease support. The lumbar control can also be moved up and down to adjust the location of the support. 1-8