The rear window heating helps to demist the rear window.
Press the 
button to switch the rear window heating on and off.
button to switch the rear window heating on and off.The rear window heating only works when the engine is running. An indicator lamp in the button lights up when the rear window heater is switched on.
Depending on the outside temperature, the rear window heating switches off automatically after about 10 to 20 minutes.
The rear window heating can be switched on permanently by pressing the button for longer than two seconds. It will then remain on until the ignition is switched off. When the rear window heating is switched on, this setting will remain activated for 15 minutes after switching off the ignition.
button for longer than two seconds. It will then remain on until the ignition is switched off. When the rear window heating is switched on, this setting will remain activated for 15 minutes after switching off the ignition.If the engine is started again during this period of 15 minutes, the rear window heating will be switched on for about 10 to 20 minutes, depending on the exterior temperature. This means you do not have to manually switch on the rear window heating again if the Audi Q5 has only been parked for a short time.
For the sake of the environment
Switch off the heated rear window manually as soon as the rear window is clear. By saving electrical power you can also save fuel.