Make sure that no moisture can enter the fuse box when the cover is open.
When closing the cover, make sure that it is lying correctly on the fuse box. Moisture seeping in or dirt could otherwise impair the operation of the fuses.

■ Open the hood.
■ Remove any existing moisture from the fuse box using a dry cloth.
■ To open: open clamps 2.
■ Fold up cover 1 in the direction of the arrow and remove it.
■ To close: check whether the seal is seated correctly in cover 1.
■ Insert cover 1 at the side of the fuse box into the retainers.
■ Fold down cover 1 and close clamps 2.
■ Close the hood.
Useful information
This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
...
Tires
GL 350 BlueTEC 4MATIC
All-weather tires
R 19
R 20
All-terrain tires
R 18
R 19
Winter tires
R 18
3 Use of snow chains not permitted. Observe the notes under "Snow chains".
...
Hood
Important safety notes
WARNING
If the hood is unlatched, it may open up when
the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving ...