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. ...

Fuse box on the left in the direction of travel
Open the hood. Remove any existing moisture from the fuse box using a dry cloth. AMG vehicles: remove the control unit above the fuse box. To open: undo screws 1 with an Allen key. ...

Storing and maintaining the current speed
You can store the current speed if you are driving faster than 20 mph (30 km/h). Accelerate the vehicle to the desired speed. Briefly press the cruise control lever up 1 or down 2. Remove your ...