See also:

SmartKey battery
Important safety notes It is advisable to have batteries replaced at a qualified specialist workshop, e.g. at an authorized Mercedes-Benz Center. WARNING   Batteries contain toxic and c ...

Activating/deactivating ATTENTION ASSIST
This function is not available in HYBRID vehicles. Press the or button on the steering wheel to select the DriveAssist menu. Press the or button to select Attention Assist. Press . ...

Important safety notes
ATTENTION ASSIST helps you during long, monotonous journeys such as on freeways and interstate highways. It is active in the range between 50 mph (80 km/h) and 112 mph (180 km/h). If ATTENTIO ...