Heated Glass Element: Description and Operation

Windshield, Backlight and Door Mirror Heating
Windshield and backlight heating is also controlled through the A/CCM. Selecting defrost will activate the heated front windshield, where fitted, which will remain active for 6 minutes unless deselected by the driver. The backlight heater will remain energised for 21 minutes unless deselected by the driver. Engine speed is signalled to the A/CCM by the ECM inhibiting windshield and rear backlight heating when the engine is not running. Under certain conditions the heated front windshield will be automatically switched on. These conditions, all of which must be met, are ambient temperature at or below 0 °C (32 °F), vehicle speed above 30 mph (50 kph), both for more than 5 minutes duration. The heated front windshield warning light will not Illuminate when the heater is on under this condition.
Switching on backlight heating also switches on door mirror heating.