How do I adjust the heated seats in the 2007 Chevrolet Uplander?

Press the heated seat button once to turn it on to the high setting, indicated by both indicator lights being lit. Press the button a second time to go to the low setting, where only one indicator light will be lit, and press it a third time to turn the heated seat off. This feature will turn off automatically when the ignition is turned off. (Page 10)