Buy 2007 Gmc Sierra 2500 HD 6.0L Vortec V8 A/T 4WD SLE Extended Cab Pickup Seat Lumbar Switch. 4-WAY Left, Power, CUSHION - OEM Gmc Part # 39010084

Switch. Lumbar. Seat.
Switch used for the adjustment of the Seat Lumbar. adjuster. Knob.

Seat Lumbar Switch

Fits Regal Sportback, Regal TourX

4-WAY LUMBAR, W/O SPORT SEAT. Regal Sportback; Left. Regal TourX; Left. W/SPORT SEAT, SEAT CUSHION.
Power Lumbar Switch - Repair or Replace
If your power lumbar doesn't move, your power lumbar switch may be the culprit. Have a technician inspect your 2007 GMC Sierra 2500 HD to see if your the switch needs to be replaced.