GMC Sierra Owners Manual
Lumbar AdjustmentSeats and Restraints / Front Seats / Lumbar Adjustment
Manual Lumbar
If equipped, increase or decrease manual lumbar support by turning the knob forward or rearward.
Power Lumbar
To adjust the power lumbar support, if equipped:
• On vehicles with two-way lumbar, press and hold the top or bottom of the control to increase or decrease lumbar support.
• On vehicles with four-way lumbar, press and hold the front or rear of the control to increase or decrease lumbar support. To raise or lower the height of the support, press and hold the top or bottom of the control.
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