GMC Sierra Quiz
Seats and Restraints

Lumbar Adjustment

In this manual: Seats and Restraints
Introduction — 6In Brief — 46Seats and Restraints — 48Storage — 7Instruments and Controls — 75Lighting — 22Infotainment System — 22Climate Controls — 7Driving and Operating — 77Vehicle Care — 79Service and Maintenance — 26Technical Data — 8Customer Information — 25OnStar — 25Keys, Doors, and Windows — 38
~1min read

Manual Lumbar

GMS Sierra: Lumbar Adjustment. Manual Lumbar

If equipped, increase or decrease manual lumbar support by turning the knob forward or rearward.

Power Lumbar

GMS Sierra: Lumbar Adjustment. 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.

Test yourself

A quick GMC Sierra quiz: every answer comes with an explanation and a link to the manual page.