Buy 2007 Gmc Sierra 2500 HD 6.0L Vortec V8 A/T 4WD SLE Extended Cab Pickup Seat Lumbar Switch. DRIVER POWER, DRIVER, Heated - OEM Gmc Part # 88949387

Control Switch. Seat Lumbar Switch.
Switch used for the adjustment of the Seat Lumbar.

Seat Lumbar Switch

Fits Bravada, Envoy, Envoy XL, Trailblazer, Trailblazer EXT

DRIVER SEAT, W/POWER, lumbar. PASSENGER SEAT, W/POWER, lumbar adjust, w/o heated seat. S-Series; Driver Seat; Bravada/Envoy/Trailblazer. S-Series; Passenger Seat; Bravada/Envoy/Trailblazer; w/o Heated Seats.
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.