See also:

Problems with the SmartKey
Problem Possible causes/consequences and Solutions You cannot lock or unlock the vehicle using the SmartKey. The SmartKey battery is discharged or nearly discharged. ...

High-beam spot lamp (vehicles with LED-daytime running lamps)/infrared light (Night View Assist Plus)
Due to their location, have the bulbs in the left-hand headlamp changed at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. Switch off the lights. Open the hood. ...

Sidewall
The part of the tire between the tread and the bead. ...