GM Service Manual Online
For 1990-2009 cars only

Your vehicle's seats may be equipped with power lumbar. They will either be 2-way or 4-way.

2-way Power Lumbar


Object Number: 1492139  Size: A2

If your vehicle has 2-way lumbar adjustment, it will have this control located on the outboard side of the front seat(s).

To increase support, press and hold the front of the control. To decrease support, press and hold the rear of the control. Let go of the control when the lower seatback reaches the desired level of support.

4-way Power Lumbar


Object Number: 810599  Size: A2

If your vehicle has 4-way lumbar adjustment, it will have this control located on the outboard side of the front seat(s).

To increase support, press and hold the front of the control. To decrease support, press and hold the rear of the control. Let go of the control when the lower seatback reaches the desired level of support.

You can also reshape the side wing area of the lower seatback for more lateral support.

To increase support, press and hold the top of the control. To decrease support, press and hold the bottom of the control. Let go of the control when the lower seatback reaches the desired level of support.

Your vehicle may have a memory function which allows seat settings to be saved and recalled. See Memory Seat for more information.

Keep in mind that as your seating position changes, as it may during long trips, so should the position of your lumbar support. Adjust the seat as needed.