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So I just noticed that my car (2012) has defrosting lines built into the bottom couple of inches of the front windshield. Is this in all ISF's or is this a Canadian option. The button for this is just below the gauge cluster to the right side of the steering wheel/column. This is not on our IS250 AWD fully loaded Nav/Luxury everything package. On the IS250 the defrost button is used as the PWR/SNOW ECT control.