
Trailer
Folding the ball coupling in/out ..... 210
Trailer coupling
see Towing a trailer
Trailer towing
7-pin connector ............................. 212
Blind Spot Assist ............................ 202
Cleaning the trailer tow hitch ......... 301
Coupling up a traile r...................... 211
Decoupling a trailer ....................... 211
Driving tips .................................... 209
Folding in the ball coupling ............ 211
Folding out the ball coupling .......... 210
Important safety notes .................. 208
Lights display message .................. 236
Mounting dimensions .................... 343
Parktronic ...................................... 181
Power supply ................................. 211
Trailer load s................................... 344
Transmission
see Automatic transmission
see Manual transmission
Transmission position display ......... 147
Transmission position display
(DIRECT SELECT lever) ...................... 147
Transporting the vehicle .................. 317
Trim pieces (cleaning instruc-
tions) .................................................. 302
Trip computer (on-board com-
puter) .................................................. 216
Trip meter
Calling up ....................................... 215
Resetting (on-board computer) ...... 216
Turn signals
Switching on/of f........................... 116
TV
Operating (on-board computer) ..... 219
see Separate operating instructions
Two-way radio
Frequencies ................................... 335
Installation ..................................... 335
Transmission output (maximum) .... 335
Type identification plate
see Vehicle identification plate
Tyre changing tool kit ....................... 305
Tyre inflation compressor
see TIREFIT kit Tyre pressure
Calling up (on-board computer) ..... 326
Display message ............................ 246
Not reached (TIREFIT) .................... 309
Reached (TIREFIT) .......................... 309
Recommended ............................... 324
Tyre pressure loss warning
General notes ................................ 325
Important safety notes .................. 326
Restarting ...................................... 326
Tyre pressure monitor
Checking the tyre pressure elec-
tronically ........................................ 327
Function/note s............................. 326
General notes ................................ 326
Important safety notes .................. 327
Restarting ...................................... 328
Warning lamp ................................. 262
Warning message .......................... 328
Tyres
Changing a whee l.......................... 328
Checking ........................................ 321
Direction of rotation ...................... 329
Display message ............................ 246
Important safety notes .................. 321
Information on driving .................... 321
MOExtended tyre s......................... 323
Replacing ....................................... 329
Service life ..................................... 322
Storing ........................................... 329
Tyre size (data ).............................. 333
Tyre tread ...................................... 322
Wheel and tyre combinations ........ 333
see Flat tyre U
Unlocking Emergency unlocking ....................... 82
From inside the vehicle (central
unlocking button) ............................. 81
USB devices
Connecting to the Media Inter-
face ............................................... 271 V
Vanity mirror (in sun visor) .............. 27920
Index

ment, lateral acceleration, accelerator pedal
position
R malfunctions and defects in important system
components, e.g. lights, brakes
R vehicle reactions and operating conditions in
special driving situations, e.g. airbag deploy-
ment, intervention of stability control sys-
tems
R ambient conditions, e.g. outside temperature
This data is of an exclusively technical nature
and can be used to:
R assist in detecting and rectifying faults and
defects
R analyse vehicle functions, e.g. after an acci-
dent
R optimise vehicle functions
The data cannot be used to trace the vehicle's
movements.
When your vehicle is serviced, technical infor-
mation can be read from the event data memory and fault data memory.
Services include, for example:
R repair services
R service processes
R warranty events
R quality assurance
The vehicle is read out by employees of the ser- vice network (including the manufacturer) using
special diagnostic testers. You can obtain more
information there, if required.
After a fault has been rectified, the information
is deleted from the fault memory or is continu-
ally overwritten.
When operating the vehicle, situations are con-
ceivable in which this technical data, in connec- tion with other information (if necessary, after
consultation with an authorised expert), could
be traced to a person.
Examples include:
R accident reports
R damage to the vehicle
R witness statements
Further additional functions that have been con- tractually agreed upon with the customer allow
certain vehicle data to be conveyed by the vehi-
cle as well. The additional functions include, for example, vehicle location in case of an emer-
gency. Copyright information
General notes
Information on licences for free and open-
source software used in your vehicle and its
electronic components is available on the fol-
lowing website:
http://www.mercedes-benz.com/opensource 28
Copyright informationIntroduction

Restraint system warning lamp
The functions of the restraint system are
checked after the ignition is switched on and at
regular intervals while the engine is running.
Therefore, malfunctions can be detected in
good time.
The 6 restraint system warning lamp in the
instrument cluster lights up when the ignition is switched on. It goes out no later than a few sec-
onds after the vehicle is started. The compo-
nents of the restraint system are in operational
readiness.
A malfunction has occurred if the 6restraint
system warning lamp:
R does not light up after the ignition is switched
on
R does not go out after a few seconds with the
engine running
R lights up again while the engine is running G
WARNING
If the restraint system is malfunctioning,
restraint system components may be trig-
gered unintentionally or might not be trig-
gered at all in the event of an accident with a high rate of vehicle deceleration. This can
effect belt tensioners or airbags, for example. There is an increased risk of serious or even
fatal injuries.
Have the restraint system checked and
repaired immediately at a qualified specialist
workshop. PASSENGER AIR BAG OFF indicator
lamp PASSENGER AIR BAG OFF indicator lamp
:is
part of the automatic child seat recognition on
the front-passenger seat.
A permanently lit PASSENGER AIR BAG OFF
indicator lamp informs you that the front-
passenger front airbag is disabled.
Depending on the person in the front-passenger seat, the front-passenger front airbag must
either be disabled or enabled; see the following
points. You must make sure of this both before
and during a journey.
R Children in a child restraint system:
whether the front-passenger front airbag is
enabled or disabled depends on the installed
child restraint system, and the age and size of the child. Therefore, it is imperative to
observe the notes on "Children in the vehicle"
(Y page 49). There you will also find infor-
mation on rearward or forward-facing child
restraint systems on the front-passenger
seat.
R All other persons: the PASSENGER AIR BAG
OFF indicator lamp must be off. Be sure to
observe the notes on "Seat belts"
(Y page 38) and "Airbags" (Y page 42).
There you can also find information on the
correct seat position.
Observe the information on automatic child seat recognition in the front-passenger seat
(Y page 51). Seat belts
Introduction A correctly worn seat belt is the most effective
means of restraining the movement of vehicle
occupants in the event of a collision or if the
vehicle overturns. This reduces the risk of vehi- cle occupants coming into contact with parts of
the vehicle interior or being ejected from it. The
seat belt also helps to keep the vehicle occu-
pants in the best position in relation to the air-
bag being deployed.
The seat belt system consists of:
R seat belts
R belt tensioners for the front seat belts and the
outer seat belts in the rear
R belt force limiters for the front seat belts and
the outer seat belts in the rear 38
Occupant safetySafety

Pelvisbags
:deploy next to and below the
outer seat cushions.
When activated, the pelvisbag enhances the
level of protection of the vehicle occupants on
the side of the vehicle on which the impact
occurs.
The pelvisbag is deployed on the side of the
impact.
i Pelvisbags are only available in certain
countries. Roll bars
G
DANGER
If the roll bar has developed a fault, it may not function, e.g. in the event of an accident. The
roll bars may then not protect the vehicle
occupants as intended. This poses an
increased risk of injury or even fatal injury.
Have roll bars checked immediately at a quali-
fied specialist workshop. G
WARNING
Risk of injury if the roll bar is triggered.
Ensure that the movement area of the rear
head restraints is kept clear.
The roll bars are under the rear head restraints. They extend if systems detect that the vehicle isin danger of overturning. Thus the rear head
restraints also extend automatically.
Once the roll bars are extended, you can no lon-
ger lower the rear head restraints. An open soft
top can no longer be closed. In this case, visit
the nearest qualified specialist workshop. Deployment of belt tensioners and air-
bags
Important safety notes G
WARNING
After the airbag deploys, the airbag parts are
hot. There is a risk of injury.
Do not touch the airbag parts. Have a
deployed airbag replaced at a qualified spe-
cialist workshop as soon as possible. G
WARNING
Pyrotechnic seat belt tensioners that have
been deployed are no longer operational and
are unable to perform their intended protec-
tive function. This poses an increased risk of
injury or even fatal injury.
Therefore, have pyrotechnic belt tensioners
which have been triggered immediately
replaced at a qualified specialist workshop.
Mercedes-Benz recommends that you have the
vehicle towed to a qualified specialist workshop
after an accident. Take this into account, par-
ticularly if a seat belt tensioner was triggered or
an airbag was deployed.
An electric motor is used by PRE-SAFE ®
to trig-
ger the tightening of the seat belt in hazardous
situations. This procedure is reversible.
If the belt tensioners are triggered or an airbag is deployed, you will hear a bang, and a small
amount of powder may also be released. The
6 restraint system warning lamp lights up.
Only in rare cases will the bang affect your hear-
ing. In general, the powder released is not haz-
ardous to health but may cause short-term
breathing difficulties to persons suffering from
asthma or other pulmonary conditions. Provided
it is safe to do so, you should leave the vehicle
immediately or open the window in order to pre- vent breathing difficulties. Occupant safety
45Safety Z

Immediately replace child restraint systems
that have been damaged or subjected to a
load in an accident. Have the child restraint
securing systems checked in a qualified spe-
cialist workshop before fitting a child restraint
system again.
Securing systems for child restraint systems
include:
R the seat belt system
R the ISOFIX securing rings
If it is absolutely necessary to fit a child restraint system on the co-driver's seat, be sure to
observe the notes on "Child restraint systems
on the co-driver's seat" (Y page 53). Informa-
tion about deactivating the co-driver's front air- bag can also be found there.
Observe the warning labels in the vehicle inte-
rior and on the child restraint system.
i It is advisable to use Mercedes-Benz care
products to clean child restraint systems rec- ommended by Mercedes-Benz. You can
obtain information at a qualified specialist
workshop. ISOFIX child seat securing system
G
WARNING
ISOFIX child restraint systems do not offer
sufficient protective effect for children whose weight is greater than 22 kg who are securedusing the safety belt integrated in the child
restraint system. The child could, for example, not be restrained correctly in the event of an
accident. This poses an increased risk of
injury or even fatal injury.
If the child weighs more than 22 kg, only use
ISOFIX child restraint systems with which the child is also secured with the vehicle seat belt. Also secure the child restraint system with the
Top Tether belt, if available.
Always observe the notes on using the child
restraint system (Y page 55) as well as the
installation and operating instructions provided
by the manufacturer for the child restraint sys-
tem being used. Before each journey, make sure that the ISOFIX
child restraint system is properly engaged in
both ISOFIX securing rings. ISOFIX securing rings
:are located between
the seat cushion and the seat backrest.
X Install the ISOFIX child restraint system on
both ISOFIX securing rings :.
ISOFIX is a standardised securing system for
special child restraint systems on the rear seats.
ISOFIX securing rings for two ISOFIX child
restraint systems are fitted on the left and right of the rear seats.
Mercedes-Benz recommends the use of the lis-
ted ISOFIX child restraint systems together with the insertion guides included (Y page 58).
Using insertion guides makes it easier to fit ISO- FIX child restraint systems.
Secure child restraint systems without an ISO-
FIX child seat securing system using the seat
belts in the vehicle. Always observe the notes on
using the child restraint system (Y page 55) as
well as the installation and operating instruc-
tions provided by the manufacturer for the child restraint system being used. Automatic child seat recognition on
the front-passenger seat
The sensor system for the automatic child seat
recognition in the front-passenger seat detects
whether a special Mercedes-Benz child restraint system with transponders has been fitted. In
this case, the PASSENGER AIR BAG OFF indica-
tor lamp lights up and remains lit. The front-
passenger front airbag is disabled. Children in the vehicle
51Safety Z

PASSENGER AIR BAG OFF indicator lamp
:
shows you whether the front-passenger front
airbag is disabled.
X Turn the key to position 1or 2in the ignition
lock or, on vehicles with KEYLESS-GO, press
the Start/Stop button once or twice.
The system carries out a self-diagnosis.
The PASSENGER AIR BAG OFF indicator lamp
must light up for approximately six seconds.
If, after the system self-test, the
PASSENGER AIR BAG OFF indicator lamp:
R lights up , the front-passenger front airbag is
disabled. It will then not be deployed in the
event of an accident.
R is not lit , the sensor system did not detect a
child restraint system with transponder for
automatic child seat recognition. If, in the
case of an accident, all deployment criteria
are met, the front-passenger front airbag is
deployed. G
WARNING
Electronic devices on the front-passenger
seat can affect the function of the automatic
child seat recognition, for example:
R laptop
R mobile phone
R transponder cards such as ski passes or
access passes
The front-passenger front airbag could deploy unintentionally or not function as intended
during an accident. This poses an increased
risk of injury or even fatal injury.
Do not place any of the devices mentioned
above or similar devices on the front-
passenger seat. Be aware of the status of the front-passenger front airbag both before and
during the journey. Child restraint system on the front-
passenger seat
General notes Accident statistics show that children secured
in the rear seats are safer than children secured
in the front seats. For this reason, Mercedes- Benz strongly advises that you fit a child
restraint system on a rear seat.
Vehicles with automatic child seat recognition
on the co-driver's seat: if it is absolutely neces-
sary to fit a child restraint system to the co-driv- er's seat, always observe the notes on "Auto-
matic child seat recognition on the co-driver's
seat" (Y page 53).
You can thus avoid the risks that could arise as
a result of:
R a child restraint system that is not detected
by the automatic child seat recognition's sen-
sor system
R the unintentional disabling of the co-driver's
front airbag
R the unsuitable positioning of the child
restraint system, e.g. too close to the dash-
board. Please observe the warning notice on the co-
driver's sun visor, see the illustration. G
WARNING
If you secure a child in a child restraint system on the front-passenger seat and the
PASSENGER AIR BAG OFF indicator lamp is
off, the front-passenger front airbag can
deploy in the event of an accident. The child
could be struck by the airbag. This poses an
increased risk of injury or even fatal injury.
Make sure that the front-passenger front air-
bag has been disabled. The PASSENGER AIR-BAG OFF indicator lamp must be lit.
NEVER use a rearward-facing child restraint on a seat protected by an ACTIVE AIRBAG in front of
it, DEATH or SERIOUS INJURY to the CHILD can
occur. Children in the vehicle
53Safety Z

Vehicles without automatic child seat
recognition on the co-driver's seat If the co-driver's seat of your vehicle is not
equipped with automatic child seat recognition,
this is indicated by a special sticker. The sticker
is affixed to the side of the dashboard on the co-
driver's side. The sticker is visible when you
open the co-driver's door.
The PASSENGER AIR BAG OFF indicator lamp
lights up briefly when the key is turned to posi-
tion 2in the ignition lock. It has no function,
however, and does not indicate that the co-driv- er's seat is equipped with automatic child seat
recognition.
If you turn the key to position 2in the ignition
lock, the PASSENGER AIR BAG OFF and
PASSENGER AIR BAG ON indicator lamps light
up briefly. They have no function, however, and do not indicate that the co-driver's seat is equip-
ped with automatic child seat recognition.
Always fit the rearward-facing restraint system
to a suitable rear seat in this case (Y page 55).
Observe the following information under "Rear-
ward-facing child restraint system" and
"Forward-facing child restraint system" and on
suitable positioning of the child restraint system
(Y page 55). Rearward-facing child restraint system Warning symbol for a rearward-facing child
restraint system
If it is absolutely necessary to fit a rearward-
facing child restraint system to the co-driver's
seat, you must always make sure that the co-
driver's front airbag is deactivated. The co-driv-
er's front airbag is only disabled if the
PASSENGER AIRBAG OFF indicator lamp is lit
continuously (Y page 38).
Always observe the information about suitable
positioning of the child restraint system
(Y page 55) as well as the child restraint sys-
tem manufacturer's installation and operating
instructions.
Forward-facing child restraint system If you secure a child in a forward-facing child
restraint system on the co-driver's seat, you
must always move the co-driver's seat as far
back as possible. The base of the child restraint system must lie fully on the co-driver's seat
cushion. The backrest of the child restraint sys-
tem must lie as flat against the co-driver's seat
backrest as possible. The child restraint system may not touch the roof or be put under strain by
the head restraint. Adjust the angle of the seat
backrest and the head restraint position accord-
ingly. Always make sure that the shoulder belt
strap is correctly routed from the seat-belt
extender on the co-driver's seat to the shoulder belt guide on the child restraint system. The
shoulder belt strap must be routed forwards
from the retracted seat-belt extender for the co-driver's seat.
Always observe the information about suitable
positioning of the child restraint system
(Y page 55) as well as the child restraint sys-
tem manufacturer's installation and operating
instructions. 54
Children in the vehicleSafety

Problems with automatic child seat recognition
Problem
Possible causes/consequences and
M
MSolutions The PASSENGER AIR
BAG OFF indicator lamp
on the centre console is
lit. A special Mercedes-Benz child restraint system with a transponder for
automatic child seat recognition has been fitted to the front-
passenger seat. The front-passenger front airbag has therefore been
disabled as desired. G
WARNING
There is no child restraint system fitted to the front-passenger seat.
Automatic child seat recognition is malfunctioning, for example due to
electronic devices on the front-passenger seat.
There is a risk of injury.
X Remove electronic equipment from the front-passenger seat, e.g.:
R laptop
R mobile phone
R a card with a transponder, such as a ski pass or access pass
If the PASSENGER AIR BAG OFF indicator lamp remains lit, the front- passenger seat may not be used.
X Consult a qualified specialist workshop. When you switch the
ignition on, the
6
restraint system warning lamp lights up and/or
the PASSENGER AIR
BAG OFF indicator lamp
does not light up briefly. G
WARNING
Automatic child seat recognition is malfunctioning.
Do not install a child restraint system on the front-passenger seat.
It is recommended that you fit the child restraint system to a suitable rear seat.
X Consult a qualified specialist workshop.
X Please also refer to the notes about the restraint system warning
lamp (Y page 235). Suitable positioning of the child
restraint system
Introduction Only child restraint systems which are approved
in accordance with the ECE standard ECE R44
are permitted for use in the vehicle.
For certain child restraint systems in weight cat-
egories II or III, this can mean that the area of
use is restricted. The maximum size setting of
the child restraint system is not possible due to possible contact with the roof.
"Universal" category child restraint systems can
be recognised by their orange approval label and the text "Universal". Example: approval label on the child restraint
system
"Universal" category child restraint systems can
be used on the seats indicated with U, UF or IUF according to the tables "Suitability of the seats
for attaching belt-secured child restraint sys- Children in the vehicle
55Safety Z