Please bear the following in mind
At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center.
Observe the notes in the "Changing a wheel" section
See also:
Cleaning the trailer tow hitch
The ball coupling must be cleaned if it becomes dirty or corroded.
Remove rust on the ball of the ball coupling, e.g. with a wire brush.
Remove dirt with a clean, lint-free cloth or a brush.
A ...
Socket in the front-compartment center console
To open: slide cover 1 forwards until it engages.
Lift up the cover of socket 2.
To close: press cover 1 briefly at the front. The cover moves back.
...
Center console, upper section
Vehicles with the Off-Road Pro
engineering package
1 Audio system/COMAND;
see separate operating
instructions
2 Hazard warning
lamps
3 Indicator
lamp
4 Seat heating
5 Seat ventila ...