Hi.
Never noticed before; but both windshields heating feature came on by themselves below freezing today. Is it normal for the thing to self-respond to ambient temperature ? The switches lit on but able to select them manually. Is that normal ? 9 days in a row below freezing now, big pile of ice removed to go running chores.

 

Not normal

 

did you have the HVAC defrost set on it's highest setting? this turns on the rear window heating wires on my '04. if equipped, it may turn on the front windscreen heating wires as well.

 

Thanks. That may be it. I think I had the heater ventilation selection set for windshield but low setting, but in auto goes to 'high' by itself ...

Edited : Confirmed. With climate control in 'heat' (economy) temperature selected as 'high' and vent port to 'windshield' , both electric windshield heaters come on.