2010 Hummer H3T Owner's Manual - Page 48
2010 Hummer H3T Manual
Page 48 highlights
3-4 . Seats and Restraints Power Lumbar Raise or lower the entire seat cushion by moving the control up or down. Reclining Seatbacks Lumbar Adjustment Manual Lumbar { WARNING You can lose control of the vehicle if you try to adjust a manual driver's seat while the vehicle is moving. The sudden movement could startle and confuse you, or make you push a pedal when you do not want to. Adjust the driver's seat only when the vehicle is not moving. On vehicles with this feature, the control is located on the outboard side of the seat(s). To increase or decrease lumbar support, press and hold the front or rear of the control. { WARNING If either seatback is not locked, it could move forward in a sudden stop or crash. That could cause injury to the person sitting there. Always push and pull on the seatbacks to be sure they are locked. On vehicles with this feature, the knob is located on the outboard side of the seat. Turn the knob clockwise or counterclockwise to increase or decrease the lumbar support.
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