Automatic Dimming Function, Switching On And Off

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-- By briefly pressing the button -1- (less than three seconds), the automatic dimming function is switched on or off automatically.

Fig 1: Identifying Dimming Function Button And Indicator Light

Courtesy of AUDI OF AMERICA, LLC

Automatic dimming "ON" : the lamp in the display -2- comes on.

Automatic dimming "OFF" : the lamp in the display -2- goes out.

Automatic dimming function is activated each time "ignition is switched on".
If the automatic dimming function is deactivated, the function is also deactivated on the exterior rearview mirror.
In dimming mode, mirror surface lights up when interior lights are switched on or reverse gear is engaged.
Note that the interior rearview mirror automatic dimming function can only work properly if the rear window sun shade is raised.