brakes MERCEDES-BENZ CLS 2018 Owners Manual

BAS PLUS (Brake Assist System
PLUS) with Cross-Traffic Assist
Function/notes ................................ 65
BAS PLUS with Cross-Traffic Assist
(Brake Assist PLUS with Cross-
Traffic Assist)
Important safety notes .................... 65
Battery (SmartKey)
Checking .......................................... 79
Important safety notes .................... 78
Replacing ......................................... 79
Battery (vehicle)
Charging ........................................ 284
Display message ............................ 214
Important safety notes .................. 282
Jump starting ................................. 285
Belt
see Seat belts
Blind Spot Assist
Activating/deactivating (on-
board computer) ............................ 196
Display message ............................ 217
Notes/function .............................. 179
see Active Blind Spot Assist
Bluetooth ®
Connecting a different mobile
phone ............................................ 241
Searching for a mobile phone ........ 240
see also Digital Operator's Man-
ual .................................................. 236
Telephony ...................................... 239
Box (trunk) ......................................... 246
Brake Assist
see BAS (Brake Assist System)
Brake fluid
Display message ............................ 206
Notes ............................................. 326
Brake force distribution
see EBD (electronic brake force
distribution)
Brake lamps
Display message ............................ 212
Brakes
ABS .................................................. 64
Adaptive Brake Assist ...................... 68
BAS .................................................. 65
BAS PLUS with Cross-Traffic
Assist ............................................... 65 Brake fluid (notes) ......................... 326
Display message ............................ 204
High-performance brake system .... 146
HOLD function ............................... 157
Important safety notes .................. 145
Maintenance .................................. 145
Parking brake ................................ 142
Riding tips ...................................... 145
Warning lamp ................................. 228
Breakdown
Where will I find...? ........................ 277
see Flat tire
see Towing away
Brightness control (instrument
cluster li ghtin g) ...................................
34
C California
Important notice for retail cus-
tomers and lessees .......................... 26
Calling up a malfunction
see Display messages
Car
see Vehicle
Care
360° camera ................................. 274
Car wash ........................................ 270
Carpets .......................................... 276
Display ........................................... 275
Exhaust pipe .................................. 274
Exterior lights ................................ 274
Interior ........................................... 275
Matte finish ................................... 272
Notes ............................................. 270
Paint .............................................. 272
Plastic trim .................................... 275
Power washer ................................ 271
Rear view camera .......................... 274
Roof lining ...................................... 276
Seat belt ........................................ 276
Seat cover ..................................... 275
Selector lever ................................ 275
Sensors ......................................... 274
Steering wheel ............................... 275
Trim pieces .................................... 275
Washing by hand ........................... 271
Wheels ........................................... 2736
Index

Central locking/unlocking
(SmartKey) ...................................... .7 6
Control panel .................................. .4 0
Display message ............................ 224
Emergency locking ........................... 83
Emergency unlocking ....................... 83
Important safety notes .................... 81
Opening (from inside) ...................... 81
Drinking and driving ......................... 143
Drive program
Automatic ...................................... 135
Display ........................................... 129
Display (DIRECT SELECT lever) ...... 130
Manual ........................................... 135
Manual (Mercedes-AMG vehi-
cles) ............................................... 136
Manual (vehicles with Sports
package AMG) ............................... 136
SETUP (on-board computer) .......... 201
Drive program selector ..................... 134
Driver's door
see Doors
Driving abroad
Mercedes-Benz Service ................. 270
Driving on flooded roads .................. 147
Driving safety systems
ABS (Anti-lock Braking System) ....... 64
ADAPTIVE BRAKE ............................. 72
Adaptive Brake Assist ...................... 68
BAS (Brake Assist System) .............. 65
BAS PLUS with Cross-Traffic
Assist ............................................... 65
COLLISION PREVENTION ASSIST
PLUS ................................................ 67
Distance warning function ............... 67
EBD (electronic brake force distri-
bution) ............................................. 72
ESP ®
(Electronic Stability Pro-
gram) ............................................... 69
Important safety information ........... 64
Overview .......................................... 64
PRE-SAFE ®
Brake ............................. 72
Driving system
RACE START (Mercedes-AMG
vehicles) ........................................ 158
Driving systems
360°camera .................................. 173 Active Blind Spot Assist ................. 182
Active Driving Assistance pack-
age ................................................. 182
Active Lane Keeping Assist ............ 184
Acti ve
Parking Assist ..................... 165
AIRMATIC ...................................... 159
AMG adaptive sport suspension
system ........................................... 161
ATTENTION ASSIST ........................ 177
Blind Spot Assist ............................ 179
Cruise control ................................ 148
Display message ............................ 215
DISTRONIC PLUS ........................... 149
DISTRONIC PLUS with Steering
Assist and Stop&Go Pilot ............... 155
HOLD function ............................... 157
Lane Keeping Assist ...................... 181
Lane Tracking package .................. 179
PARKTRONIC ................................. 163
Rear view camera .......................... 169
Traffic Sign Assist .......................... 178
Driving tips
AMG ceramic brakes ..................... 146
Automatic transmission ................. 133
Brakes ........................................... 145
Break-in period .............................. 122
Downhill gradient ........................... 145
Drinking and driving ....................... 143
Driving in winter ............................. 147
Driving on flooded roads ................ 147
Driving on wet roads ...................... 147
Exhaust check ............................... 144
Fuel ................................................ 143
General .......................................... 143
Hydroplaning ................................. 147
Icy road surfaces ........................... 147
Limited braking efficiency on sal-
ted roads ....................................... 145
Snow chains .................................. 294
Wet road surface ........................... 145
DVD video
Operating (on-board computer) ..... 193
see also Digital Operator's Man-
ual .................................................. 236 Index 9

Data acquisition ............................... 30
Display message ............................ 223
Equipment ....................................... 26
Individual settings .......................... 197
Limited Warranty ............................. 30
Loading .......................................... 302
Locking (in an emergency) ............... 83
Locking (SmartKey) .......................... 76
Lowering ........................................ 316
Maintenance .................................... 27
Parking for a long period ................ 143
Pulling away ................................... 125
Raising ........................................... 313
Reporting problems ........................ .2 9
Securing from rolling away ............ 313
Towing away .................................. 287
Transporting .................................. 289
Unlocking (in an emergency) ........... 83
Unlocking (SmartKey) ...................... 76
Vehicle data ................................... 328
Vehicle data ....................................... 328
Vehicle dimensions ........................... 328
Vehicle emergency locking ................ 83
Vehicle identification number
see VIN
Vehicle identification plate .............. 322
Vehicle level
AIRMATIC ...................................... 159
Vehicle level (display message) ....... 215
Vehicle tool kit .................................. 277
Video
Operating the DVD ......................... 193
see also Digital Operator's Man-
ual .................................................. 236
VIN
Seat ............................................... 323
Type plate ...................................... 322
Voice Control System
see See also Digital Operator's Manual
W
Warning and indicator lamps
ABS ................................................ 229
Brakes ........................................... 228
Check Engine ................................. 232
Coolant .......................................... 232
Distance warning ........................... 234 ESP ®
.............................................. 229
ESP ®
OFF ....................................... 230
Fuel tank ........................................ 232
General notes ................................ 226
Overview .......................................... 34
PASSENGER AIR BAG OFF ............... 42
Reserve fuel ................................... 232
Restraint system ............................ 231
Seat belt ........................................ 227
SPORT handling mode ................... 231
Tire pressure monitor .................... 235
Warranty .............................................. 26
Washer fluid
Display message ............................ 225
Weather display (COMAND)
see also Digital Operator's Man-
ual .................................................. 236
Wheel and tire combinations
Tires ............................................... 317
Wheel bolt tightening torque ........... 316
Wheel chock ...................................... 313
Wheels
Changing a wheel .......................... 312
Checking ........................................ 292
Cleaning ......................................... 273
Emergency spare wheel ................. 317
Important safety notes .................. 292
Information on driving .................... 292
Interchanging/changing ................ 312
Mounting a new wheel ................... 315
Mounting a wheel .......................... 313
Removing a wheel .......................... 315
Storing ........................................... 313
Tightening torque ........................... 316
Wheel size/tire size ....................... 317
Window curtain air bag
Operation ......................................... 49
Windows
see Side windows
Windshield
Defrosting ...................................... 118
Windshield washer fluid
see Windshield washer system
Windshield washer system
Adding washer fluid ....................... 269
Important safety notes .................. 32722
Index

The following text is reproduced as required of
all manufacturers under Title 49, Code of U.S.
Federal Regulations, Part 575 pursuant to the
National Traffic and Motor Vehicle Safety Act of
1966.
If you believe that your vehicle has a defect
which could cause a crash or could cause injury
or death, you should immediately inform the
National Highway Traffic Safety Administration
(NHTSA) in addition to notifying Mercedes-Benz
USA, LLC.
If NHTSA receives similar complaints, it may
open an investigation, and if it finds that a safety
defect exists in a group of vehicles, it may order
a recall and remedy campaign. However, NHTSA
cannot become involved in individual problems
between you, your dealer, or Mercedes-Benz
USA, LLC.
To contact NHTSA, you may call the Vehicle
Safety Hotline toll-free at 1-888-327-4236
(TTY: 1-800-424-9153 ); go to http://
www.safercar.gov ; or write to: Administrator,
NHTSA, 400 Seventh Street, SW., Washington,
DC 20590.
You can also obtain other information about
motor vehicle safety from
http://www.safercar.gov
Limited Warranty
! Follow the instructions in this manual about
the proper operation of your vehicle as well as
about possible vehicle damage. Damage to
your vehicle that arises from culpable contra-
ventions against these instructions is not cov-
ered either by the Mercedes-Benz Limited
Warranty or by the New or Used-Vehicle War-
ranty.
QR codes for the rescue card
The QR codes are secured in the fuel filler flap
and on the opposite side on the B-pillar. In the
event of an accident, rescue services can use
the QR code to quickly find the appropriate res-
cue card for your vehicle. The current rescue
card contains the most important information
about your vehicle in a compact form, e.g. the
routing of the electric cables.
You can find more information under http://
portal.aftersales.i.daimler.com/public/ content/asportal/en/communication/
informationen_fuer/QRCode.html.
Data stored in the vehicle
Data storage A wide range of electronic components in your
vehicle contain data memories.
These data memories temporarily or perma-
nently store technical information about: R
the vehicle's operating state R
incidents R
malfunctions
In general, this technical information docu-
ments the state of a component, a module, a
system or the surroundings.
These include, for example: R
operating conditions of system components,
e.g. fluid levels R
the vehicle's status messages and those of its
individual components, e.g. number of wheel
revolutions/speed, deceleration in move-
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. air bag 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 recognizing and rectifying malfunc-
tions and defects R
analyze vehicle functions, e.g. after an acci-
dent R
optimize 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 malfunction data memory.
Services include, for example: R
repair services R
service processes R
warranties R
quality assurance30
Data stored in the vehicle
Introduction

Function PRE-SAF E ®
intervenes:R
in emergenc y braking situations, e.g. when
BA S is activatedR
in critical driving situations, e.g. when physi-
cal limits are exceeded and th e vehicl e under-
steer s or oversteer s severelyR
on vehicles wit h th e Drivin g Assistanc e pack-
age: if BA S PLU S intervenes powerfully or th e
radar sensor system detect s an imminent
danger of collision in certai n situation s
PRE-SAF E ®
takes th e followin g measures
depending on th e hazardous situation detected:R
th e fron t seat belt s are pre-tensioned.R
th e front-passenger seat is adjusted if it is in
an unfavorable position .R
if th e vehicl e skids, th e side windows and th e
sliding sunroo f are closed.R
vehicles wit h a multicontour seat or active
multicontour seat : th e air pressur e in th e side
bolsters of th e backrest is increased.
If th e hazardous situation passes without result -
ing in an accident, PRE-SAF E ®
slackens th e belt
pre-tensioning . On vehicles wit h multicontour
seat s or active multicontour seats, th e air pres-
sure in th e side bolsters is reduce d again . All
setting s made by PRE-SAF E ®
can then be
reversed.
If th e seat belt pre-tensioning is no t reduced:X
Mov e th e seat backrest or seat bac k slightly
when th e ve hicl e i s stationary.
The seat belt pre-tensioning is reduce d and
th e lockin g mechanism is released.
The seat-belt adjustmen t is an integral part of
th e PRE-SAF E ®
convenience function . Informa-
tion about th e convenience function can be
foun d under "Belt adjustment" ( Y
page 45).
PRE-SAFE ®
PLUS (anticipatory occu-
pant protection system PLUS)
Introduction
PRE-SAF E ®
PLU S is only available in vehicles
wit h th e Drivin g Assistanc e package.
Usin g th e radar sensor system, PRE-SAF E ®
PLU S is able to detect that a head-on or rear-end
collision is imminent . In certai n hazardous sit - uations, PRE-SAF E ®
PLU S takes pre-emptive
measures to protect th e vehicl e occupants.
Important safety notes The intervention of PRE-SAF E ®
PLU S canno t
preven t an imminent collision .
The driver is no t warned about th e intervention
of PRE-SAF E ®
PLUS.
PRE-SAF E ®
PLU S does no t interven e if th e vehi-
cle is backin g up.
When driving , or when parking or exiting a park -
ing spac e wit h assistanc e from Active Parking
Assist , PRE-SAF E ®
PLU S will no t apply th e
brakes.
Function PRE-SAF E ®
PLU S intervenes in certai n situa-
tion s if th e radar sensor system detect s an
imminent head-on or rear-end collision .
PRE-SAF E ®
PLU S takes th e followin g measures
depending on th e hazardous situation detected: R
if th e radar sensor system detect s that a
head-on collision is imminent , th e seat belt s
are pre-tensioned. R
if th e radar sensor system detect s that a rear -
en d collision is imminent :-
th e brak e pressur e is increased if th e driver
applie s th e brakes when th e vehicl e is sta-
tionary. -
th e seat belt s are pre-tensioned.
The PRE-SAF E ®
PLU S braking application is can -
celed: R
if th e accelerato r pedal is depressed when a
gear is engage d R
if th e ris k of a collision passes or is no longer
detected R
if DISTRONI C PLU S indicates an intention to
pull away
If th e hazardous situation passes without result -
ing in an accident, th e original setting s are
restored .Occupant safety 57
Safety Z

BAS (Brake Assist System)
General information BAS operates in emergency braking situations.
If you depress the brake pedal quickly, BAS
automatically boosts the braking force, thus
shortening the stopping distance.
Important safety notes
i Observe the "Important safety notes" sec-
tion ( Y
page 64).
G WARNING
If BAS is malfunctioning, the braking distance
in an emergency braking situation is
increased. There is a risk of an accident.
In an emergency braking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
Braking X
Keep the brake pedal firmly depressed until
the emergency braking situation is over.
ABS prevents the wheels from locking.
The brakes will function as usual once you
release the brake pedal. BAS is deactivated.
BAS PLUS (Brake Assist PLUS) with
Cross-Traffic Assist
General information BAS PLUS can help you to minimize the risk of a
collision with a vehicle or a pedestrian and
reduce the effects of such a collision. If BAS
PLUS detects a danger of collision, you are
assisted when braking.
i Pay attention to the important safety notes
in the "Driving safety systems" section
( Y
page 64).
BAS PLUS is only available on vehicles with the
Driving Assistance package.
For BAS PLUS to assist you when driving, the
radar sensor system and the camera system
must be operational. With the help of a sensor system and a camera
system, BAS PLUS can detect obstacles: R
that are in the path of your vehicle for an
extended period of time R
that cross the path of your vehicle
In addition, pedestrians in the path of your vehi-
cle can be detected.
BAS PLUS detects pedestrians by using typical
characteristics such as the body contours and
posture of a person standing upright.
If the radar sensor system or the camera system
is malfunctioning, BAS PLUS functions are
restricted or no longer available. The brake sys-
tem is still available with complete brake boost-
ing effect and BAS.
i Observe the restrictions described in the
"Important safety notes" section
( Y
page 65).
Important safety notes
G WARNING
BAS PLUS cannot always clearly identify
objects and complex traffic situations.
In such cases, BAS PLUS may: R
intervene unnecessarily R
not intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake. Terminate the
intervention in a non-critical driving situation.
G WARNING
BAS PLUS cannot always clearly identify peo-
ple, this is especially the case if they are mov-
ing. BAS PLUS cannot intervene in these
cases. There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
G WARNING
BAS PLUS does not react: R
to small people, e.g. children R
to animals R
to oncoming vehicles R
when corneringDriving safety systems 65
Safety Z

As a result, BAS PLUS may not intervene in all
critical situations. There is a risk of an acci-
dent.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
In the event of snowfall or heavy rain, the rec-
ognition can be impaired.
Recognition by the radar sensor system is also
impaired if: R
there is dirt on the sensors or anything else
covering the sensors R
there is interference by other radar sources R
there are strong radar reflections, for exam-
ple in parking garages R
a narrow vehicle is traveling in front, e.g. a
motorbike R
a vehicle is traveling in front on a different line R
vehicles quickly move into the radar sensor
system detection range
Recognition by the camera system is also
impaired in the event of: R
dirt on the camera or if the camera is covered R
glare on the camera system, e.g. from the sun
being low in the sky R
darkness R
or if: -
pedestrians move quickly, e.g. into the path
of the vehicle -
the camera system no longer recognizes a
pedestrian as a person due to special cloth-
ing or other objects -
a pedestrian is concealed by other objects -
the typical outline of a person is not distin-
guishable from the background
Following damage to the fro nt end of the vehicle,
h
ave the configuration and operation of the
radar sensors checked at a qualified specialist
workshop. This also applies to collisions at slow
speeds where there is no visible damage to the
front of the vehicle.
Following damage to the windshield, have the
configuration and operation of the camera sys-
tem checked at a qualified specialist workshop. Function To avoid a collision, BAS PLUS calculates the
brake force necessary if: R
you approach an obstacle, and R
BAS PLUS has detected a risk of collision
At speeds of under 20 mph (30 km/h) : if you
depress the brake pedal, BAS PLUS is activated.
The increase in brake pressure will be carried
out at the last possible moment.
At speeds of above 20 mph (30 km/h) : if you
depress the brake pedal sharply, BAS PLUS
automatically increases the brake pressure to a
degree suited to the traffic situation.
BAS PLUS provides braking assistance in haz-
ardous situations with vehicles in front within a
speed range between 4 mph (7 km/h) and
155 mph (250 km/h).
Up to a speed of approximately 44 mph
(70 km/h), BAS PLUS may react to: R
stationary objects in the path of your vehicle,
e.g. stopped or parked vehicles R
pedestrians in the path of your vehicle R
obstacles crossing your path, which move in
the detection range of the sensors and are
recognized by them
i If BAS PLUS demands particularly high brak-
ing force, preventative passenger protection
measures (PRE-SAFE ®
) are activated simulta-
neously. X
Keep the brake pedal depressed until the
emergency braking situation i s over.
ABS prevents the wheels from locking.
BAS PLUS is deactivated and the brakes func-
tion as usual, if: R
you release the brake pedal. R
there is no longer a risk of collision. R
no obstacle is detected in front of your vehi-
cle. R
you depress the accelerator pedal. R
you activate kickdown.66
Driving safety systems
Safety

In such cases, Adaptive Brake Assist can: R
intervene unnecessarily R
not intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake. Terminate the
intervention in a non-critical driving situation.
G WARNING
Adaptive Brake Assist does not react: R
to people or animals R
to oncoming vehicles R
to crossing traffic R
when cornering
As a result, the Adaptive Brake Assist may not
intervene in all critical conditions. There is a
risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
Due to the nature of the system, particularly
complicated but non-critical driving conditions
may also cause Brake Assist to intervene.
If adaptive Brake Assist is not available due to a
malfunction in the radar sensor system, the
brake system remains available with full brake
boosting effect and BAS.
ESP ®
(Electronic Stability Program)
General notes
i Observe the "Important safety notes" sec-
tion ( Y
page 64).
ESP ®
monitors driving stability and traction, i.e.
power transmission between the tires and the
road surface.
If ESP ®
detects that the vehicle is deviating from
the direction desired by the driver, one or more
wheels are braked to stabilize the vehicle. The
engine output is also modified to keep the vehi-
cle on the desired course within physical limits.
ESP ®
assists the driver when pulling away on
wet or slippery roads. ESP ®
can also stabilize
the vehicle during braking. ETS/4ETS (Electronic Traction System) ETS traction control is part of ESP ®
. On vehicles
with 4MATIC, 4ETS is part of ESP ®
.
Traction control brakes the drive wheels indi-
vidually if they spin. This enables you to pull
away and accelerate on slippery surfaces, for
example if the road surface is slippery on one
side. In addition, more drive torque is transfer-
red to the wheel or wheels with traction.
Traction control remains active, even if you
deactivate ESP ®
.
Important safety notes
i Observe the "Important safety notes" sec-
tion ( Y
page 64).
G WARNING
If ESP ®
is malfunctioning, ESP ®
is unable to
stabilize the vehicle. Additionally, further driv-
ing safety systems are deactivated. This
increases the risk of skidding and an accident.
Drive on carefully. Have ESP ®
checked at a
qualified specialist workshop.
! Vehicles with 4MATIC: function or perform-
ance tests may only be carried out on a 2-axle
dynamometer. Before you operate the vehicle
on such a dynamometer, please consult a
qualified workshop. You could otherwise
damage the drive train or the brake system.
Vehicles without 4MATIC: observe the notes on
ESP ®
( Y
page 289) when towing the vehicle
with a raised rear axle.
If the

of collision, you will be warned visually and
acoustically as well as by automatic braking.
i Pay attention to the important safety notes
in the "Driving safety systems" section
( Y
page 64).
PRE ‑ SAFE ®
Brake is only available in vehicles
with the Driving Assistance Plus package.
For PRE-SAFE ®
Brake to assist you when driving,
the radar sensor system and the camera system
must be switched on and be operational.
With the help of the radar sensor system and the
camera system, PRE-SAFE ®
Brake can detect
obstacles that are in front of your vehicle for an
extended period of time.
In addition, pedestrians in the path of your vehi-
cle can be detected.
PRE-SAFE ®
Brake detects pedestrians using
typical characteristics such as the body con-
tours and posture of a person standing upright.
i Observe the restrictions described in the
"Important safety notes" sec-
tion“ ( Y
page 73).
Important safety notes
G WARNING
PRE-SAFE ®
Brake will initially brake your vehi-
cle by a partial application of the brakes if a
danger of collision is detected. There may be
a collision unless you brake yourself. Even
after subsequent full application of the brakes
a collision cannot always be avoided, partic-
ularly when approaching at too high a speed.
There is a risk of an accident.
Always apply the brakes yourself and try to
take evasive action, provided it is safe to do
so.
In the event of a partial application of the brakes,
the vehicle is braked with up to 50% of the full
braking pressure.
G WARNING
PRE-SAFE ®
Brake cannot always clearly iden-
tify objects and complex traffic conditions. In these cases, PRE-SAFE ®
Brake may:R
give an unnecessary warning and then
brake the vehicle R
not give a warning or intervene
There is a risk of an accident.
Always pay particular attention to the traffic
situation and be ready to brake, especially if
PRE-SAFE ®
Brake warns you. Terminate the
intervention in a non-critical driving situation.
G WARNING
PRE-SAFE ®
Brake cannot always clearly iden-
tify people, especially if they are moving. In
these cases, PRE-SAFE ®
Brake cannot inter-
vene. There is a risk of an accident.
Always pay particular attention to the traffic
situation and be ready to brake, especially if
PRE-SAFE ®
Brake warns you.
In order to maintain the appropriate distance to
the vehicle in front and thus prevent a collision,
you must apply the brakes yourself.
G WARNING
PRE-SAFE ®
Brake does not react: R
to small people, e.g. children R
to animals R
to oncoming vehicles R
to crossing traffic R
when cornering
As a result, PRE-SAFE ®
Brake may neither
give warnings nor intervene in all critical sit-
uations. There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
In the event of snowfall or heavy rain, the rec-
ognition can be impaired.
Recognition by the radar sensor system is also
impaired if: R
there is dirt on the sensors or anything else
covering the sensors R
there is interference by other radar sources R
there are strong radar reflections, for exam-
ple in parking garagesDriving safety systems 73
Safety Z

R
the system detects that the windshield is not
fogged up when the air-conditioning system is
switched on R
the hood is closed R
the driver's door is closed and the driver's
seat belt is fastened
i All of the vehicle's systems remain active
when the engine is stopped automatically.
i The HOLD function can also be activated if
the engine has been switched off automati-
cally. It is then not necessary to continue
applying the brakes during the automatic stop
phase. When you depress the accelerator
pedal, the engine starts automatically and the
braking effect of the HOLD function is deac-
tivated.
Automatic engine switch-off can take place a
maximum of four times in a row (initial stop, then
three subsequent stops).
Mercedes-AMG vehicles: the number of con-
secutive automatic engine switch-offs is unlimi-
ted.
All other models: automatic engine switch-off
can take place a maximum of four times in a row
(initial switch-off, then three subsequent switch-
offs).
Automatic engine start The engine starts automatically if: R
you switch off the ECO start/stop function by
pressing the ECO button R
in transmission position D or N the brake
pedal is released and the HOLD function is not
active R
you depress the accelerator pedal R
you engage reverse gear RR
you move the transmission out of position PR
you switch to drive program S , S+ or M
(Mercedes-AMG vehicles) R
you unfasten your seat belt or open the driv-
er's door R
the vehicle starts to roll R
the brake system requires this R
the temperature in the vehicle interior devi-
ates from the set range R
the system detects moisture on the wind-
shield when the air-conditioning system is
switched on R
the battery's condition of charge is too low i Shifting the transmission to position P does
not start the engine.
Deactivating or activating the ECO
start/stop function Mercedes-AMG vehicles X
To deactivate: in drive program C , press ECO
button C .
or X
Switch to drive program S , S+ or M
( Y
page 134).
Indicator lamp D goes out.X
To activate: press ECO button C .
Indicator lamp D lights up.
If drive program S , S+ or M is active, the auto-
matic transmission switches to drive program
C .
If indicator lamp D is off, the ECO start/stop
function has been deactivated manually or as
the result of a malfunction. The engine will then
not be switched off automatically when the vehi-
cle stops.
All other models Driving 127
Dr ivi ng an d parking Z