See also:

Interior rearview mirror, automatic dimming feature
Photocells are used for control: In the mirror glass. On the back of the mirror. For proper operation: Keep the photocells clean. Do not cover the area between the inside rearview ...

Switching on/off
Press the button. ...

Malfunction
In the event of a failure or malfunction of the parking brake, secure the vehicle against rolling using a wheel chock, for example, when leaving it. ...