What should I do if my vehicle has heated seats?
The heated seat buttons are located on the climate control panel. Press the button once for high setting (both indicator lights lit), a second time for low setting (one indicator lit), or a third time to turn it off. The heated seat feature automatically turns off when the ignition is turned off. (Page 10)
From the official Chevrolet 2007 Uplander Minivan manual, page 10
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