Switching the rear window heater on/off
The rear window heater consumes a lot of electricity. You should therefore switch off the rear window heater as soon as the rear window is clear.
Switch on the ignition.
Press the top or bottom of the 
rocker switch.
rocker switch. If the indicator lamp above the rocker switch lights up, the rear window heater is switched on.
The rear window heater will switch off automatically after a few minutes.