Page 230 of 435
229 Controls in detail
Loading
Loading
Roof rack* Preparing roof rack installation
Open trim at the trim strips in the roof. 
Secure the roof rack according to man-
ufacturer’s instructions for installation. 
Loading instructions
The total load weight including vehicle oc-
cupants and luggage/cargo should not ex-
ceed the vehicle capacity weight indicated 
on the corresponding label located on the 
driver’s door pillar.
Warning!
G
Use only roof racks approved by Mer-
cedes-Benz for your vehicle model to avoid 
damage to the vehicle. Follow manufactur-
er’s installation instructions.
!Load the roof rack in such a way that 
the vehicle cannot be damaged while 
driving.
Make sure
you can fully raise the 
sliding/pop-up roof
you can fully open the trunk 
     
        
        Page 285 of 435

284 OperationTires and wheelsTire pressure changes by approximately 
1.5 psi (0.1 bar) per 18°F (10°C) of air 
temperature change. Keep this in mind 
when checking tire pressure where the 
temperature is different from the outside 
temperature.
Tire temperature and tire pressure also in-
crease while driving, depending on the 
driving speed and the tire load.Check the spare tire periodically for condi-
tion and inflation pressure. Spare tires will 
age and become worn over time even if 
never used, and thus should be inspected 
and replaced when necessary or after a 
maximum of six years.
iThe pressures listed for light loads are 
minimum values offering high driving 
comfort.
Increased inflation pressures listed for 
heavier loads may also be used for light 
loads. These higher pressures produce 
favorable handling characteristics. The 
ride of the vehicle, however, will be 
somewhat harder. Never exceed the 
max. values or inflate tires below the 
min. values listed on the fuel filler flap.
Warning!
G
Follow recommended tire inflation pres-
sures.
Do not overinflate tires. Overinflating tires 
can result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes, 
etc.
Do not underinflate tires. Underinflated tires 
wear unevenly, adversely affect handling 
and fuel economy, and are more likely to fail 
from being overheated.
Do not overload the tires by exceeding the 
specified vehicle capacity weight (as indicat-
ed by the label on the pillar in the driver’s 
door opening). Overloading the tires can 
overheat them, possibly causing a blowout. 
     
        
        Page 287 of 435

286 OperationTires and wheels
Activating the tire inflation pressure 
monitor
You must activate the tire inflation pres-
sure monitor in the following cases:
If you have changed the tire pressure
If you have replaced the wheels or tires
If you have installed new wheels or 
tires
Make sure the tire pressure is correctly 
set.
Press buttonè orÿ on the mul-
tifunction steering wheel repeatedly 
until the standard display menu ap-
pears in the multifunction display 
(page 134).
Press button j or k repeatedly 
until you see the current inflation pres-
sures for each tire appear in the display
or the following message appears in 
the displayTIRE PRES.
DISPLAY AFTER DRIVING
A FEW MINS. 
REACTIVATE USING 
R-BUTTON
Warning!
G
Follow recommended tire inflation pres-
sures.
Do not overinflate tires. Overinflating tires 
can result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes, 
etc.
Do not underinflate tires. Underinflated tires 
wear unevenly, adversely affect handling 
and fuel economy, and are more likely to fail 
from being overheated.
Do not overload the tires by exceeding the 
specified vehicle capacity weight (as indicat-
ed by the label on the pillar in the driver’s 
door opening). Overloading the tires can 
overheat them, possibly causing a blowout.
iIf transporting a deflated road wheel or 
additional wheel sensors in the vehicle, 
the tire inflation pressure monitor 
should not be reactivated until the de-
flated wheel or additional wheel sen-
sors have been removed from the 
vehicle. Otherwise, the deflated wheel 
or additional sensors could cause the 
tire inflation pressure monitor system 
to malfunction. 
     
        
        Page 290 of 435

289 Operation
Tires and wheels
Reactivating the tire pressure monitor
The tire pressure monitor must be reacti-
vated in the following situations:
If you have changed the tire pressure
If you have replaced the wheels or tires
If you have installed new wheels or 
tires
Using the table on the fuel filler flap, 
make sure the tire inflation pressure of 
all four tires is correct.
Press button j or k repeatedly 
until you see the current inflation pres-
sures for each tire appear in the display
or the following message appears in 
the displayTIRE PRES. DISPLAY 
APPEARS AFTER 
DRIVING A FEW MINUTES
Warning!
G
The tire inflation pressure monitor does not 
indicate a warning for wrongly selected in-
flation pressures. Always adjust tire inflation 
pressure according to the label on the fuel 
filler flap.
The tire inflation pressure monitor is not 
able to issue a warning due to a sudden dra-
matic loss of pressure (e.g. tire blowout 
caused by a foreign object). In this case 
bring the vehicle to a halt by carefully apply-
ing the brakes and avoiding abrupt steering 
maneuvers.iOperating radio transmission equip-
ment (e.g. wireless headsets, two-way 
radios) in or near the vehicle could 
cause the tire inflation pressure moni-
tor to malfunction. 
Warning!
G
Follow recommended tire inflation pres-
sures.
Do not overinflate tires. Overinflating tires 
can result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes, 
etc.
Do not underinflate tires. Underinflated tires 
wear unevenly, adversely affect handling 
and fuel economy, and are more likely to fail 
from being overheated.
Do not overload the tires by exceeding the 
specified vehicle capacity weight (as indicat-
ed by the label on the pillar in the driver’s 
door opening). Overloading the tires can 
overheat them, possibly causing a blowout.