The pre-warning display can occur in the following situations.› If there is a risk of collision with a moving obstacle at a driving speed range
of approx. 30 km/h to approx. 210 km/h.
› If there is a risk of collision with a stationary obstacle at a driving speed
range of approx. 30 km/h to approx. 85 km/h.
When the advance warning is issued, the brake pedal must be pressed or the
moving obstacle avoided!
Acute alert
If the driver does not react to the advance warning, the system briefly applies
the brake automatically via an active brake intervention to draw attention to
the potential danger of a collision again.
Automatic Braking
If the driver fails to respond to the acute warning, the system starts to apply
the brakes automatically with increasing stopping power in several stages.
Brake Support
If the driver does not brake sufficiently in the event of an impending collision,
the system automatically increases the braking force.
The brake support only occurs as long as the brake pedal is being firmly press-
ed down.
Note
■ If an automatic brake intervention is triggered by the system, the pressure in
the brake system increases and the brake pedal cannot be operated with the
normal pedal stroke.■
The automatic braking interventions can be cancelled by pressing the accel-
erator pedal or by means of a steering intervention.
Activating/deactivating
Read and observe
and on page 155 first.
The function is automatically activated each time the ignition is switched on.
The system should only be disabled in exceptional cases »
.
The system can be activated or deactivated in one of two ways. › In the instrument cluster display
» page 51, Menu item wizard .
› In Infotainment
» Infotainment operating instructions , chapter Vehicle set-
tings (CAR button) .
The following functions can be activated or deactivated separately in infotain-
ment.
› Distance warning
› Advance warning
Once one of these functions has been deactivated, it remains disabled even
after switching the ignition off and on.WARNINGIn the following situations, Front Assistant should be deactivated for safety
reasons.■
When the vehicle is being towed away.
■
When the vehicle is on a rolling test bench.
■
If an unfounded warning was issued or a system action carried out.
■
When on a truck, car ferry or similar.
Information messages
Read and observe
and on page 155 first.
The information messages are shown in the instrument cluster display. Front Assist: No sensor view.
The sensor is soiled or covered.
Stop the vehicle, switch off the engine and clean the sensor or remove the
item causing the lack of visibility » Fig. 154 on page 155 .
If the message appears again after starting the engine, the system should be disabled » page 157 . Seek help from a specialist garage.
Front Assist not available.
The system is not available for an unknown reason.
Stop the vehicle, switch off the engine and then start it again.
If the message appears again after starting the engine, the system should be
disabled » page 157 . Seek help from a specialist garage.
157Assist systems
START-STOP
Introduction
This chapter contains information on the following subjects:
Operating conditions of the system
158
Operation in vehicles with manual gearbox
158
Operation in vehicles with automatic gearbox
159
System related automatic start-up
159
Manually deactivating/activating the system
159
Information messages
160
The START-STOP system (hereinafter referred to as the system) saves fuel and
reduces polluting emissions and CO 2 emissions by turning the engine off, e.g.
when stopping at traffic lights, and starting the engine again when moving off.
WARNING■ Never let the vehicle roll with the engine switched off.■The brake servo unit and power steering only operate if the engine is run-
ning.
Operating conditions of the system
Fig. 156
Engine is automatically switched
off / automatic engine cut off is
not possible
Read and observe on page 158 first.
For system-dependent automatic engine shutdown
to work, the following conditions must be met.
The driver's door is closed.
The driver has fastened the seat belt.
The bonnet is closed.
The driving speed was higher than 4 km.h after the last stop.
No trailer is coupled.
Some additional conditions for the system to function correctly cannot be in-
fluenced or recognised by the driver. Therefore, the system can react differ-
ently in situations which are identical from the driver's perspective.
If, after stopping the vehicle, the check icon
» Fig. 156 appears on the dis-
play, then the conditions for automatic engine shutdown are not met.
Running the engine is essential for the following reasons, for example.
› The engine temperature for the proper function of the system has not yet
been reached.
› The charge state of the vehicle battery is too low.
› The current consumption is too high.
› High air-conditioning or heating capacity (high fan speed, big difference be-
tween the desired and actual interior temperature).
Information about the current status of the system can be displayed in the In-
fotainment display » operating instructions for Infotainment , chapter Vehicle
settings (CAR button) .
Note
■
If the vehicle remains outdoors for a long time in minus temperatures or in
direct sunlight, it can take several hours until the internal temperature of the
vehicle battery reaches a suitable temperature for proper operation of the
START STOP system.■
If the driver's seat belt is removed for more than approx. 30 seconds or the
driver's door is opened during stop mode, the engine will have to be started
manually.
■
After the manual engine start and with a manual gearbox the automatic en-
gine shutdown can take place only when a minimum distance required for the
system function has been covered.
Operation in vehicles with manual gearbox
Read and observe
on page 158 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Stop the vehicle.
›
Put the gear stick into Neutral.
158Driving
›Release the clutch pedal.
Automatic engine shutdown then occurs and the indicator symbol appears in
the display
» Fig. 156 on page 158 .
Automatic engine start›
Depress the clutch pedal.
The automatic re-start process takes place and the indicator symbol
goes
out.
Operation in vehicles with automatic gearbox
Read and observe
on page 158 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Bring the vehicle to a stop and depress the brake pedal.
Automatic engine shutdown then occurs and the indicator symbol appears in
the display
» Fig. 156 on page 158 .
Automatic engine start
›
Release the brake pedal.
The automatic re-start process takes place and the indicator symbol goes
out.
Further information on automatic transmission
Engine shut down takes place when the selector lever is in positions P, D/S , N
and in Tiptronic mode.
When the selector lever is in position P the engine remains shut down after
you release the brake pedal. The engine starts automatically by pressing the
gas pedal or by moving the selector lever into a different mode and releasing
the brake pedal.
If the engine is off due to the automatic and the selector lever is put to the R
position then the automatic starts the engine.
If the gear selector is moved from position R to the position D/S or N the vehi-
cle must reach a speed of more than 10 km / h before the automatic engine
shutdown starts.
There is no automatic engine shutdown when the system detects a vehicle
moving due to a large steering angle.
No automatic engine shutdown takes place when the vehicle is moving at low
speed (e.g. during a traffic jam or when tuning) and remains stationary after
pressing the brake pedal lightly. Automatic engine shutdown takes place if you
press the brake pedal down with more force.
System related automatic start-up
Read and observe
on page 158 first.
When the engine is off, the system can automatically start the engine beforethe desired journey continues. Some possible reasons for this are:
› The vehicle begins to roll, e.g. on a slope.
› The brake pedal has been actuated several times.
› The current consumption is too high.
Manually deactivating/activating the system
Fig. 157
Button for the START-STOP sys-
tem
Read and observe on page 158 first.
Deactivating/activating
›
Press the symbol button
» Fig. 157 .
When start-stop mode is deactivated, the warning light in the button lights up.
Note
■ If the system is deactivated when the engine is turned off automatically,
then the automatic start process takes place.■
Selecting the driving mode Eco when the system is deactivated will automat-
ically activate the system » page 160, Selection of travel mode (Driving Mode
Selection) .
159Assist systems
Information messagesRead and observe
on page 158 first.
The information messages are shown in the instrument cluster display. Start the engine manually!
START MANUALLY
One of the conditions for automatic engine start is not satisfied or the driver's
seat belt is not fastened. The engine must be started manually.
On vehicles with the starter button, the ignition is turned off by the first press of the starter button; the start process is only initiated when the button is
pressed for the second time.
Error: start-stop system
START STOP ERROR
A system error is present. Seek help from a specialist garage.
Selection of travel mode (Driving Mode Selection)
Introduction
This chapter contains information on the following subjects:
Selection
160
Normal Mode
160
Sportmode
160
Ecomode
161
Individualmode
161
By selecting the driving mode, the driving behavior can be adapted to the de-
sired mode of operation.
The following modes of Normal, Sport, Eco, Individual are available.
The set driving mode remains stored even after switching the ignition on and
off.
WARNING■ The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Adjust the speed and driving style to the current visibility, weather, road
and traffic conditions.
SelectionFig. 158
Button for selecting the driving mode: Version 1/version 2
Read and observe
on page 160 first.
›
Press the symbol button or
» Fig. 158 .
The menu is displayed on the infotainment screen.
The mode is changed by repeatedly pressing the symbol button or
or in
the Infotainment display » Infotainment operating instructions , chapter Vehi-
cle settings .
If a driving mode other than Normal is selected, then the symbol lights up on
the button or
» Fig. 158 .
WARNINGSetting the driving mode while driving can distract you from other traffic –
risk of accident.
Normal Mode
Read and observe
on page 160 first.
This mode is suitable for common everyday use.
SportmodeRead and observe
on page 160 first.
This mode is suitable for a sporty driving style.
Selecting this mode primarily affects the function of the following systems.
160Driving
CAUTION■Just filling the tank once with diesel fuel that does not comply with the
standard, can cause severe damage to parts of the engine, the fuel and ex-
haust system!■
If a different fuel other than diesel fuel, which complies to the above men-
tioned standards (e.g. petrol) is used, do not start the engine or switch on the
ignition! Extensive damage to engine parts can occur!
■
Water which has collected in the fuel filter can cause engine faults.
CAUTION
■ The vehicle cannot be operated with bio fuel RME, therefore this fuel must
not be filled in the tank and used for driving the vehicle. The use of biofuel
RME can cause considerable damage to parts of the engine or fuel system.■
Do not mix any fuel additives, so-called “flow improvers” (petrol and similar
agents) into the diesel. This can result in considerable damage to parts of the
engine or the exhaust system.
Refuelling with CNG (compressed natural gas)
Fig. 182
Natural gas filler tubes
Read and observe
and on page 188 first.
Natural gas refuelling can be carried out if the following conditions are met. The vehicle is unlocked.
The engine and the ignition are switched off.
The auxiliary heating and ventilation is switched off » page 122.
The gas filler tube for refuelling with natural gas is located behind the fuel fill- er flap next to the petrol filler tube.
The filling couplings of the natural gas refuelling systems may differ in han-
dling. When refuelling with natural gas at unfamiliar refuelling systems, you
should seek help from trained fuel station staff. If unsure, have the refuelling done by trained fuel station staff.
Open fuel filler flap›
Open the fuel filler flap.
›
Remove cap
A
» Fig. 182 from gas filler tube
B
in direction of the arrow.
›
Plug the filling coupling of the refuelling system on the gas filler tube
B
.
The fuel tank is full when the compressor of the refuelling system automati-
cally switches off. To stop the refuelling operation prematurely, press the
“Stop ” button of the refuelling system.
Closing the filler cap
›
Check that sealing ring
C
» Fig. 182 has remained inserted in the gas filler
tube.
If sealing ring
C
has slipped onto the filling coupling, reinsert it into the gas
filler tube.
›
Plug the cap
A
onto the gas filler tube.
›
Close the bonnet.
The natural gas refuelling systems have an overfill protection relating to the
outdoor temperature. At very high outside temperatures, it may happen that
the gas tank may not be fully refuelled.
The natural gas system of your vehicle is suitable both for “slow fuelling” (fuel-
ling from small compressors) and for “quick fuelling” (fuelling from natural gas
stations with large compressors).
If the vehicle is parked for a longer period of time immediately after refuelling,
the situation may arise in which the pointer of the fuel tank gauge does not
indicate exactly the same level as was the case immediately after refuelling
when the engine is restarted. This is not due to any system leakages but a
drop in pressure in the natural gas fuel tank due to technical reasons after a
cooling phase directly after refuelling.
The maximum lifetime of the gas tank is 20 years.
The capacity of the natural gas fuel tank is approximately 15 kg.
The capacity of the gasoline fuel tank is about 50 litres, of which about 6
lighters are in reserve.
191Inspecting and replenishing
No.Consumer12Radio13Belt tensioner - driver's side14Air blower for air conditioning,heating15Electric steering lock16Signal amplifier for telephone, telephone preinstallation17Instrument cluster18Not assigned19KESSY control unit20Operating lever underneath the steering wheel21Not assigned22Towing hitch - contact in the socket23Light - right24Panorama roof25Control unit for central locking front door right, power windows -
left26Heated front seats27Music amplifier28Towing hitch - left light29CNG relay30Not assigned31Headlight - left32Parking aid (Park Assist)33Airbag switch for hazard warning lights
34
TCS, ESC button, tyre control display, pressure sensor for air-condi-
tioning, reverse light switch, interior mirror with automatic dim-
ming, START-STOP button, telephone preinstallation, control for
heating of rear seats, sensor for air-conditioning, 230 V power
socket, sport-sound generator35Headlight, headlamp beam adjustment, diagnostic connector, cam-
era, radar36Headlight right37Headlight left38Towing hitch - right lightNo.Consumer39Control unit for central locking front door - right, power windows -
front and rear right4012-Volt power socket41Not assigned42Control unit for central locking rear door - left, right, headlight
cleaning system, windscreen wipers43Visor for gas discharge bulbs, interior lighting44Towing hitch - contact in the socket45Control unit for control of seat adjustment46230-Volt power socket47Rear window wiper48Not assigned49Coil on starter relay, clutch pedal switch50Opening the boot lid51Belt tensioner - front passenger side52Not assigned53Relay for rear window heater
Fuses in the engine compartment
Fig. 222
Removing the fuse box cover/fuses
230Do-it-yourself
Hydraulic Brake Assist (HBA)140
I
Ice scrapers
183
Ignition lock127
Immobilizer126
Individual settings Locking
57
Unlocking57
Inertia reel15
Information system45
Compass point display52
Door warning47
Eco-tips52
Gear recommendation46
Lap timer51
MAXI DOT display50
Multifunction display47
Operation46
Outside temperature46
Service interval display53
Stop watch51
Instrument cluster30
Auto-check control47
Counter for distance driven33
Display31
Overview31
Revolutions counter31
Speedometer32
Temperature gauge32
Viewing the charge level of the vehicle battery 34
Warning icons
40
Warning lights34
Interior care185
Natural leather186
Interior light Front
78
Interior lights Rear
79
Interior monitor60
ISOFIX25
J
Jack
212
Maintenance184
Jump-starting220
K
KESSY Locking
56
Unlocking56
Key Locking
55
Starting the engine127
Stopping the engine127
Switching off the ignition127
Switching on the ignition127
Unlocking55
Knee airbag18
L
Lamp failure Warning symbol
43
Lamps Warning symbol
43
Lane Assist162
Activating/deactivating164
Information messages164
Operation163
Warning light39
Lap timer51
Leather Natural leather care
186
LEAVING HOME77
Lever Main beam
73
Turn signal73
Levers Windscreen wipers
82
LichtCOMING HOME / LEAVING HOME77
light travel mode
74
Light Cockpit
78
Fog lights with CORNER function76
High beam assistant75
Replacing bulbs231
tourist light74
lighting entry space
80
Lighting Luggage compartment
103
Lights71
Adaptive headlights (AFS)74
Automatic driving lamp control73
Daylight running72
Fog lights76
Hazard warning light system77
Headlight beam range regulation71
Headlight flasher73
Low beam71
Main beam73
Parking lights71, 78
Rear fog light76
Switching on and off71
Turn signal73
Warning lights34
Locking Individual settings
57
KESSY56
Key55
Remote control55
Locking/unlocking the steering lock Starter button
128
Locking and unlocking the vehicle from the in- side
58
Locking the door without a locking cylinder Emergency
226
265Index
RoofLoad115
Roof rack113
mounting points114
Roof load115
Stowing in the luggage compartment115
Rubber seals183
S
SAFE See Safe securing system
57
SAFELOCK See Safe securing system
57
Safe securing system57
Safety8
Child safety22
Child safety seats22
Correct seated position9
Head restraints88
ISOFIX25
TOP TETHER27
Saving electrical energy136
Saving fuel136
Seals Vehicle care
183
Seat belt Warning icon
41
warning light36
Seat belts12
Belt tensioners15
fastening and unfastening14
Height adjustment15
Seatbelts Inertia reels
15
Seat belts The physical principle of a head-on collision
13
Seat features90
Seats Folding front passenger seat92
Front armrest91
Head restraints88
Heating90
Memory Function of the electrically adjustable seat
89
Rear armrest91
Seat backrests92
Storing in memory of remote control key89
Seats and head restraint86
see automatic gearbox Manual shifting of gears on the multifunction steering wheel
134
see Instrument cluster see Instrument cluster
30
Select driving mode Eco mode
161
Individual mode161
Sport mode160
Selection of travel mode160
Selector lever Refer to Selector lever
133
Selector lever lock Indicator light
40
Service178
Service interval display53
Setting33
Positions of the variable loading floor111
seats and head restraints86
Setting the33
Side airbag19
Sliding/tilting roof Malfunctions - variant 1
68
Malfunctions - variant 2 69
Malfunctions of the sun screen - variant 270
SmartGate Connection
124
Password125
Settings125
Smart Gate Website125
Snow chains210
Sockets 230 V
101
spare213
spare wheel213
instructions213
Spare wheel Changing
213
Speedometer32
see speedometer32
Speed symbol see Wheels
207
Spoiler179
Staring engine Jump-starting
220
START-STOP158
Jump-starting220
Manually deactivating/activating the system159
Operating conditions of the system158
operation in vehicles with automatic gearbox159
operation in vehicles with manual gearbox158
system-related automatic start-up159
Warning icon44
Starter button Locking/unlocking the steering lock
128
Problems starting the engine130
Starting or stopping the engine by pressing a button
128
Starting the engine129
Switching off the engine129
Switching off the ignition129
Switching on the ignition129
Starting and stopping the engine using the key 126
Starting engine Jump-starting
220
Starting or stopping the engine by pressing a button
128
268Index