How do you turn on heated mirrors on gm envoy?

To turn on the heated mirrors on a GMC Envoy, locate the mirror control switch on the driver's side door panel. If your model is equipped with heated mirrors, there should be a button with a heated mirror icon. Press this button to activate the heated mirrors, which will help defrost or clear fog from the mirror surface. The heating function typically works automatically when the vehicle's defroster is engaged.