Chevrolet 1999 Silverado 1500 Pickup Owner's Manual page 11

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Power Lumbar Control (If Equipped)
To increase support, press and hold the front of the
rocker switch. Let go of the switch when the lower
seatback reaches the desired level of support.
If you have power lumbar
adjustment, you can
increase or decrease lumbar
support in an area of the
lower seatback.
To decrease support, press and hold the rear of the
rocker switch. Let go of the switch when the lower
seatback reaches the desired level of support.
You can also reshape the back wing area of the
lower seatback.
To increase support, press and hold the top of the rocker
switch. Let go of the switch when the lower seatback
reaches the desired level of support.
To decrease support, press and hold the bottom of the
rocker switch. Let go of the switch when the lower
seatback reaches the desired level of support.
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Silverado 1999

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