Page 316 of 491

315 Operation
Tires and wheels
Certification label
Even after careful determination of the 
combined weight of all occupants, cargo 
and the trailer tongue load (if applicable) 
(page 315) as to not exceed the permis-
sible load limit, you must make sure that 
your vehicle never exceeds the Gross Vehi-
cle Weight Rating (GVWR) and the Gross 
Axle Weight Rating (GAWR) for either the 
front or rear axle. You can obtain the 
GVWR and GAWR from the Certification 
label. The Certification Label can be found 
on the driver’s door B-pillar, see “Technical 
data” (
page 440).Gross Vehicle Weight Rating (GVWR): The 
total weight of the vehicle, all occupants, 
all cargo, and the trailer tongue load 
(
page 315) must never exceed the 
GVWR.
Gross Axle Weight Rating (GAWR): The to-
tal allowable weight that can be carried by 
a single axle (front or rear). 
To assure that your vehicle does not ex-
ceed the maximum permissible weight 
limits (GVWR and GAWR for front and rear 
axle), have the loaded vehicle (including 
driver, passengers and all cargo and, if ap-
plicable, trailer fully loaded) weighed on a 
suitable commercial scale.Trailer tongue load
The tongue load of any trailer is an impor-
tant weight to measure because it affects 
the load you can carry in your vehicle. If a 
trailer is towed, the tongue load must be 
added to the weight of all occupants riding 
and any cargo you are carrying in the 
vehicle. The tongue load typically is ten 
percent of the trailer weight and every-
thing loaded in it.
Your Mercedes-Benz has been designed 
primarily to carry passengers and their 
cargo. Mercedes-Benz does not recom-
mend trailer towing with your vehicle. 
     
        
        Page 352 of 491
351 Practical hints
What to do if …
Where will I find ...?
Unlocking / locking in an emergency
Opening / closing in an emergency
Replacing bulbs
Replacing wiper blades
Flat tire
Batteries
Jump starting
Towing the vehicle
Fuses 
     
        
        Page 378 of 491

377 Practical hints
What to do if …
Display symbol
Display messages
Possible cause
Possible solution
(USA only);(Canada only)3
Brake fluid
Visit workshop
There is insufficient brake fluid in the 
reservoir.
Risk of accident! Stop the vehicle and 
notify an authorized Mercedes-Benz 
Center. Do not add brake fluid! This 
will not solve the problem.
Warning!
G
Driving while these messages are displayed 
can result in an accident. Have your brake 
system checked immediately.
If there is a malfunction in the SBC brake 
system, we recommend that the vehicle be 
transported with all wheels off the ground 
using flatbed or appropriate wheel lift / dolly 
equipment.
A tow bar must be used if circumstances do 
not permit the use of the recommended 
towing methods and the vehicle requires 
towing with all four wheels on the ground.
 Towing the vehicle with all four wheels on 
the ground is only permissible for distances 
u p  t o  3 0 m i l e s  ( 5 0 k m )  a n d  a t  a  s p e e d  n o t  t o  
exceed 30 mph (50 km / h). For more infor-
mation, refer to “Towing the vehicle” 
(page 430).
If the SBC brake system enters its emergen-
cy operation mode, the driver must apply 
significantly greater brake pedal pressure 
and depress the pedal much further than 
normal to obtain braking effect. If neces-
sary, apply full pressure to the brake pedal. 
Brakes may only be applied to the front 
wheels. Stopping distance is increased!
Do not add brake fluid before checking the 
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot 
engine parts and the brake fluid catching 
fire. You can be seriously burned.!If you find that the brake fluid in the 
brake fluid reservoir has fallen to the 
minimum mark or below, have the 
brake system checked for brake pad 
thickness and leaks. 
     
        
        Page 404 of 491
403 Practical hints
Where will I find ...?
More information can be found in the 
“Technical data” section (
page 446).
Vehicle tool kit
The vehicle tool kit is stored in the com-
partment underneath the cargo compart-
ment floor (
page 402).
The vehicle tool kit includes:
One pair of universal pliers
One towing eye bolt
One wheel wrench
One alignment bolt
One fuse extractor
Spare fuses
Collapsible wheel chock
A pair of glovesSetting up the collapsible wheel chock
The collapsible wheel chock serves to 
additionally secure the vehicle, e.g. while 
changing the wheel.
1Tilt the plates upward
2Fold the lower plate outward
3Insert the plate
Tilt both plates upward1.
Fold the lower plate outward2.
Guide the tabs of the lower plate all the 
way into the openings of the base 
plate3. 
     
        
        Page 431 of 491

430 Practical hintsTowing the vehicleMercedes-Benz recommends that the vehi-
cle be transported with all wheels off the 
ground using flatbed or appropriate wheel 
lift/dolly equipment. This method is pref-
erable to other types of towing.When circumstances do not permit the 
recommended towing methods, the vehi-
cle may be towed with all wheels on the 
ground or front wheels raised (except vehi-
cles with 4MATIC) only so far as necessary 
to have the vehicle moved to a safe loca-
tion where the recommended towing 
methods can be employed.
!Use flatbed or wheel lift / dolly equip-
ment with SmartKey in starter switch 
turned to position0.
Do not tow with sling-type equipment. 
Towing with sling-type equipment over 
bumpy roads will damage radiator and 
supports.
To prevent damage during transport, 
do not tie down vehicle by its chassis or 
suspension parts.
Switch off the tow-away alarm and the 
automatic central locking.
Do not tow-start the vehicle.
!Vehicles with 4MATIC:
Do not tow with one axle raised. Doing 
so could damage the transfer case, 
which is not covered by the 
Mercedes-Benz Limited Warranty.
All wheels must be on or off the ground. 
Observe instructions for towing the ve-
hicle with all wheels on the ground.
!If the vehicle is towed with the front 
axle raised (not permissible for vehicles 
with 4MATIC), the engine must be shut 
off (SmartKey in starter switch 
position0 or 1). Otherwise the ESP will 
immediately be engaged and will apply 
the rear wheel brakes.
When towing the vehicle with all wheels 
on the ground, the selector lever must 
be in positionN and the SmartKey 
must be in starter switch position2.
When towing the vehicle with all wheels 
on the ground or the front axle raised, 
the vehicle may be towed only for dis-
tances up to 30 miles (50 km) and at a 
speed not to exceed 30 mph 
(50 km/h).  
     
        
        Page 432 of 491

431 Practical hints
Towing the vehicle
!
To be certain to avoid a possibility of 
damage to the drive train, however, we 
recommend the drive shaft be discon-
nected at the rear axle drive flange (ve-
hicles with 4MATIC: disconnected at 
the front and rear axle drive flanges) for 
any towing beyond a short tow to a 
nearby garage.
Warning!
G
If circumstances require towing the vehicle 
with all wheels on the ground, always tow 
with a tow bar if:
the engine will not run
there is a malfunction in the SBC brake 
system
there is a malfunction in the power sup-
ply or in the vehicle’s electrical system
as that will be necessary to adequately con-
trol the towed vehicle.
Prior to towing the vehicle with all wheels on 
the ground, make sure the SmartKey is in 
starter switch position2.
If the SmartKey is left in the starter switch 
position0 for an extended period of time, it 
can no longer be turned in the switch. In this 
case, the steering is locked. To unlock, re-
move SmartKey from starter switch and re-
insert.
Warning!
G
The brake system requires electrical power 
to operate.
A malfunction in the vehicle’s power supply 
or electrical system may impair brake sys-
tem operation and switch it into its emer-
gency operation mode. To brake, the driver 
must then apply significantly greater brake 
pedal pressure and depress the pedal much 
further to obtain the expected braking ef-
fect. If necessary, apply full pressure to the 
brake pedal. Brakes may only be applied to 
the front wheels. Stopping distance is in-
creased! Adapt your driving style according-
ly. For more information, refer to “SBC brake 
system” (
page 92).
With the engine not running, there is no 
power assistance for the steering system. In 
this case, it is important to keep in mind that 
a considerably higher degree of effort is nec-
essary to steer the vehicle. Adapt your driv-
ing accordingly. 
     
        
        Page 433 of 491

432 Practical hintsTowing the vehicle
iTo signal turns while being towed with 
the hazard warning flasher in use, turn 
SmartKey in starter switch to 
position2 and activate the combina-
tion switch for the left or right turn sig-
nal in the usual manner – only the 
selected turn signal will operate.
Upon canceling the turn signal, the haz-
ard warning flasher will operate again.
!When towing the vehicle with all wheels 
on the ground, please note the follow-
ing:
With the automatic central locking acti-
vated and the SmartKey in starter 
switch position2, or KEYLESS-GO* 
start / stop button in position2, the ve-
hicle doors lock if the left front wheel 
as well as the right rear wheel are turn-
ing at vehicle speeds of approximately 
9mph (15km/h) or more.
Switch off the tow-away alarm 
(page 99).
To prevent the vehicle door locks from 
locking, deactivate the automatic cen-
tral locking (
page 122). 
Towing of the vehicle should only be 
done using the properly installed tow-
ing eye bolt. Never attach tow cable, 
tow rope or tow rod to the vehicle chas-
sis, frame or suspension parts.
iThe selector lever will remain locked in 
positionP and the SmartKey will not 
turn in the starter switch if the battery 
is disconnected or discharged. For 
more information, see “Battery” 
(page 424) and “Jump starting” 
(page 428).
For information on manual unlocking of 
the transmission selector lever, see 
(page 405). 
     
        
        Page 434 of 491
433 Practical hints
Towing the vehicle
Installing towing eye bolt
Front of vehicle
1Cover on right side of front bumperTo remove cover:
Press mark on cover in direction of ar-
row.
Lift cover off to reveal threaded hole for 
towing eye bolt.
The towing eye bolt is supplied with the 
tool kit (located in the storage compart-
ment under the cargo compartment floor).
Screw towing eye bolt in to its stop and 
tighten with lug wrench.
To reinstall cover:
Fit cover and snap into place.Rear of vehicle
2Cover on right side of rear bumper
To remove cover:
Pull cover in the direction of the arrow.
Fold cover down to reveal threaded 
hole for the towing eye bolt.
The towing eye bolt is supplied with the 
tool kit (located in the storage compart-
ment under the cargo compartment floor).
Screw towing eye bolt in to its stop and 
tighten with lug wrench.
To reinstall cover:
Fit cover and snap into place.