
An overview of the available settings for adjusting the direction of the air
outletSet the direction of the air outletActive air outlet vents » Fig. 1191. 2 . 41. 2 . 4 . 53 . 44 . 5
CAUTION
To ensure that the heating, the manual air conditioning and the Climatronic
systems work properly, do not block up the air outlet vents with any objects.99Heating and ventilation

OperationFig. 123
Display
Vehicles with manual transmission
The motor is automatically switched off as soon as the vehicle comes to a halt,
the shift lever is shifted to the neutral position and the clutch pedal is re-
leased.
The motor is automatically started as soon as the clutch pedal is depressed.
Vehicles with automatic transmission
The motor is automatically switched off as soon as the vehicle comes to a
standstill and the brake pedal is actuated.
The motor is automatically started as soon as the brake pedal is released.
Conditions for the system function
The following conditions are required for the correct system function.
The driver's door is closed.
The driver has fastened the seat belt.
The bonnet is closed.
The driving speed exceeded 4 km/h after the last stop.
No trailer is coupled.
System status
The system status is shown on the display » Fig. 123 when stopped.
The engine is automatically switched off; when driving off again, the en-
gine is started automatically.
The motor is not automatically switched off.
Reasons for the engine running
Running the engine can be essential when stopped, for the following reasons. ▶ 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 indoor temperature).
When the engine is shut-down automatically and the system detects that the
engine is required such as when the brake pedal is pressed repeatedly then
the system automatically starts the engine.
Infotainment display
Information about the current status of the system can be displayed in the In-
fotainment display » Owner´s Manual Infotainment , chapter CAR - Vehicle set-
tings (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 sys-
tem.■
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.
■
No automatic engine shut-down takes place when a vehicle with automatic
transmission is moving at low speed (e.g. during a traffic jam) and remains sta-
tionary after pressing the brake pedal lightly. Automatic engine shutdown
takes place if you press the brake pedal down with more force.
■
For vehicles with automatic transmission there is no automatic engine shut-
down when the system detects a manoeuvring action due to a large steering
angle.
105Starting-off and driving

Manually deactivating/activatingFig. 124
Button for the START-STOP sys-
tem
Deactivate/activate
›
Press the button
» Fig. 124 .
When system is deactivated, the warning light in the button illuminates.
If the system is deactivated, then it is automatically activated again after
switching the ignition off and on.
Note
If the system is automatically deactivated when the engine is turned off, then
the automatic start process takes place.
Information messages
The warning symbols are shown in the instrument cluster display.
Start the engine manually!START MANUALLY
If for example the driver's seat belt is stored, the engine must be started man-
ually.
On vehicles with the starter button the ignition is turned off by the first press
of the start button, only after pressing for the second time is the start process
initiated.
Error: start-stop systemSTART STOP ERROR
A system error is present. Seek help from a specialist garage.
Brakes and parking
Introduction
This chapter contains information on the following subjects:
Information for braking
106
Handbrake
107
Parking
108WARNING■ Greater physical effort is required for braking when the engine is switch-
ed off – risk of accident.■
The clutch pedal must be depressed when braking on a vehicle with man-
ual transmission, when the vehicle is in gear and at low revs. Otherwise,
the functionality of the brake system may be impaired – risk of accident!
■
When leaving the vehicle never leave persons leave unattended in the
vehicle who could release the brake. The vehicle might then move off – risk
of accident.
■
Observe the recommendations on the new brake pads » page 112.
CAUTION
Never let the brakes slip with light pressure on the pedal if braking is not nec-
essary. This causes the brakes to overheat and can also result in a longer brak-
ing distance and excessive wear.
Information for braking
Read and observe
and on page 106 first.
Wear-and-tear
The wear of the brake pads is dependent on the operating conditions and driv-
ing style.
The brake pads wear more quickly if a lot of journeys are completed in towns
and over short distances or if a very sporty style of driving is adopted.
Under these severe conditions , the thickness of the brake pads must also be
checked by a specialist garage between services.
Wet roads or road salt
The performance of the brakes can be delayed as the brake discs and brake
pads may be moist or have a coating of ice or layer of salt on them in winter.
The brakes are cleaned and dried by applying the brakes several times »
.
106Driving

Drive especially carefully for the first 500 km or so.
New brake pads
New brake pads have to first “grind in” because these do not initially have the
best possible braking effect.
Drive especially carefully for the first 200 km or so.
Tips for economical driving
To achieve the lowest possible fuel consumption, the following instructions
must be observed.
Looking ahead when driving
Avoid unnecessary acceleration and braking.
Change gear in an energy saving and timely manner
Observe the recommended gear » page 39.
Avoid full throttle and high speeds
Fuel consumption can be reduced by half if only three-quarters of the possible
top speed of your vehicle is used.
Reducing idling
If the vehicle is fitted with the START - STOP system there is an automatic re-
duction of the idling. If the engine is stopped on vehicles without START-STOP
system, such as when waiting in a traffic jam, the fuel economy is already
greater after 30 - 40 s than the fuel quantity which is required for engine re-
start.
Avoid short distances
When driving a short distance of less than about 4 km, the engine cannot
reach its operating temperature. As long as the engine has not reached oper-
ating temperature, the fuel consumption is significantly higher than with the
engine hot.
Pay attention to the correct tyre inflation pressure being maintained
Further information » page 161.
Avoid unnecessary ballast
Per 100 kg of weight, consumption increases by about 0.3 l/100 km. At a speed
of 100 - 120 km/h, a vehicle fitted with a roof rack cross member without a load
will use about 10 % more fuel than normal due to the increased aerodynamic
drag.
Saving electricity
Only turn on electrical consumers (e.g. seat, window and mirror heating, etc.)
for as long as necessary.
Use the cooling system economically
The air conditioning system compressor uses power from the engine when in
cooling mode, which will affect the fuel consumption.
It recommended to open the windows or the doors of a vehicle for which the
interior has been strongly heated through the effect of direct sunlight in order
to allow the heated air to escape.
The cooling system should not be switched on if the windows are open.
DriveGreen function
Fig. 130
Shown in the infotainment dis-
play
The DriveGreen function (hereinafter referred to as "DriveGreen") evaluates
the driving efficiency based on information relating to the driving style. Useful
tips for reducing fuel consumption are also offered.
DriveGreen can be displayed on the Infotainment as follows.
›
Press the button in the Infotainment and then in the display the function
keys one after the other
DriveGreen
.
A
driving liquid display
With the driving is liquid the display is near the green dot. When accelerating
or braking, the indicator moves down or up.
B
“Green leaf”
The leaf margin shown in green shows with a few seconds, the current drive
efficiency. When driving economically there are several green layers on the
edge of the leaf. If you are not driving economically, no green colour appears
and the leaf may disappear completely.
112Driving

Driving through waterFig. 131
Maximum permissible water lev-
el when driving through water
The following instructions must be observed if vehicle damage is to be avoided
when driving through water (e.g. flooded roads).
›
Therefore, always determine the depth of the water before driving through
water.
The water level must not reach above the web of the lower sill » Fig. 131.
›
Do not drive any faster than at a walking speed.
At a higher speed, a water wave can form in front of the vehicle, which can
cause water to penetrate into the engine's air intake system or other parts of
the vehicle.
›
Never stop in the water, do not reverse and do not switch the engine off.
CAUTION
■ Should water penetrate into the intake system of the engine, there is a risk
of serious damage to the engine parts!■
When driving through water, some vehicle parts such as chassis, electrics or
transmissions may be severely damaged.
■
Oncoming vehicles can generate water waves which can exceed the permis-
sible water level for your vehicle.
■
Potholes, mud or rocks can be hidden under the water, making it difficult or
impossible to drive through water.
■
Do not drive through salt water, as the salt can cause corrosion. A vehicle
coming into contact with salt water is to be thoroughly rinsed with fresh wa-
ter.
Assist systems
General information
Introduction
WARNINGThe following general instructions regarding the use of assistance systems
must be observed.■
The assistance systems only serve to support and do not relieve the driv-
er of the responsibility for driving the vehicle.
■
The increased safety provision, as well as the increased occupant protec-
tion provided by the assistance systems must not tempt you to take risks -
risk of accident!
■
Adjust the speed and driving style to the current visibility, weather, road
and traffic conditions.
■
The assistance systems have physical and system-related limitations. For
this reason, the driver may experience some undesired or delayed system
responses in certain situations. You should therefore always be alert and
ready to intervene!
■
Only enable, disable or set the assistance systems so that you have the
car fully under control in every traffic situation - risk of accident!
Braking and stabilisation systems
Introduction
This chapter contains information on the following subjects:
Stability Control (ESC)
115
Anti-lock braking system (ABS)
115
Traction control (TCS)
115
Electronic differential lock (EDL and XDS)
116
Brake Assist (HBA)
116
Hill Start Assist (HHC)
116
Multi collision brake (MCB)
116
This chapter describes the functions of the brake and stabilization systems.
The error display is in Chapter » page 31, Warning lights .
114Driving

WARNING (Continued)■External noise sources may affect the signals of the system sensors. Un-
der adverse conditions, this may cause objects or people to be not recog-
nised by the system.■
Before reversing, you should make sure that there are no small obstacles,
such as rocks, thin posts, trailer drawbars etc. in front or behind your vehi-
cle. Such obstacles may not be recognised by the system sensors.
CAUTION
■ Keep the system sensors » Fig. 133 on page 117 clean, snow-and ice-free and
do not cover with any objects of any kind, otherwise the system functioning
may be impaired.■
Under adverse weather conditions (heavy rain, water vapour, very low or
high temperatures, etc.), the system function may be limited - “incorrect recog-
nition of obstacle”.
■
Accessories additionally installed on the vehicle rear, such as bicycle carriers,
can impair the system function.
Function
Fig. 133
Installation position of the sensors on the left side of the vehicle:
front/rear
Fig. 134
Sampled areas and range of the
sensors
Read and observe and on page 116 first.
The system uses ultrasound waves to calculate the distance between the
bumper and an obstacle. The ultrasonic sensors are, depending on vehicle
equipment,, located in the back or in the front bumper » Fig. 133.
Depending on the equipment, the following system versions can exist
» Fig. 134 .
▶ Version 1: warns of obstacles in the areas
C
,
D
.
▶ Version 2: warns of obstacles in the regions
A
,
B
,
C
,
D
.
Approximate range of sensors (in cm)
Area » Fig. 134Version 1
(3 sensors)Version 2
(7 sensors)A-120B-60C160160D6060
Audible signals
The interval between the acoustic signals becomes shorter as the clearance is
reduced. A continuous tone sounds from a distance of approx. 30 cm - danger
area. From this moment on do not continue driving!
The acoustic signals can be set in the Infotainment » Owner´s Manual Infotain-
ment , chapter CAR - Vehicle Settings .
Towing a trailer
When towing, or when another accessory is connected to the trailer socket on-
ly the areas
A
and
B
» Fig. 134 are active in the system.
117Assist systems

Basic requirements for starting the controlThe CCS is activated.
On vehicles with a manual transmission , the second gear or higher is en-
gaged.
On vehicles with an automatic transmission , the selector lever is in the
D/S position or in the Tiptronic position.
The current speed is higher than approx. 20 km/h.
This is only possible within the range which is permitted by the power output
and braking power of the engine.WARNINGIf the engine power and engine braking effect is insufficient to maintain
the set speed, vehicle operation must be taken over!
Operating Description
Fig. 140
Cruise control system controls
Read and observe on page 119 first.
Overview of the control elements of the CCS » Fig. 140ADeactivate CCS (delete set speed) Interrupt control (sprung position) Activate CCS (control deactivated)BTake control again a)
/ Increase speedCStart control / reduce speedDSwitch between GRA and Speed Limiter » page 120a)
If no speed is set the current speed is adopted.
At the start of the regulation the GRA regulates the vehicle to the current
speed, and this speed is shown on the instrument cluster display. The warning
light
illuminates in the instrument cluster.
Automatic control interruption
Automatic control interruption occurs if any of the following conditions are
met.
▶ The brake pedal is operated.
▶ When one of the brake assist systems (e.g. ESC) intervenes.
▶ Through an airbag deployment.
▶ The key
is actuated.WARNING■
Always deactivate the cruise control system after use to prevent the sys-
tem being enabled unintentionally.■
Control may only be resumed if the set speed is not too high for the cur-
rent traffic conditions.
Note
■ During control, speed can be increased by pressing the accelerator pedal. Re-
leasing the accelerator pedal will cause the speed to drop again to the set
speed.■
By pressing the
button during the regulation this is cancelled and the
Speed Limiter is activated.
Speed limiter
Introduction
This chapter contains information on the following subjects:
Operation
121
Operation description
121
The Speed Limiter limits the maximum driving speed to the set speed limit.
This limit can only be exceeded by depressing the accelerator pedal fully.
The condition in which the Speed Limiter monitors a potential set speed limit
excess is referred to as Regulation.
120Driving

Exceeding the speed limit during the regulation
If exceeding the speed limit is required during the regulation, for example
when overtaking, then the accelerator pedal is to be fully pressed.
When exceeding the speed limit, an acoustic signal sounds and the warning
light
in the instrument cluster flashes.
The regulation is resumed once the speed has fallen below the set limit.
CAUTION
When driving downhill, exceeding the set speed limit may occur. When exceed-
ing the limit, an acoustic signal sounds and the warning light in the instru-
ment cluster flashes.
Note
By pressing the button during the regulation this is cancelled and the GRA
is activated.
Front Assist
Introduction
This chapter contains information on the following subjects:
Radar sensor
122
Operation
123
Distance warning (dangerous distance)
123
Warning and automatic braking
123
Disable/enable
124
Information messages
125
The Front Assist (hereinafter referred to as "system") warns you of the danger
of a collision with a vehicle or another obstacle in front of the vehicle, and tries
to avoid a collision or mitigate its consequences by automatically applying the
brakes where necessary.
The area in front of the vehicle is monitored by a radar sensor » Fig. 144 on
page 122 .
WARNING■
The general information relating to the use of assistance systems must
be observed » page 114, in section Introduction .■
The system does not respond to crossing or oncoming objects.
CAUTIONIn case of failure of more than one brake light on the vehicle or on the electri-
cally connected trailer, the system becomes unavailable.
Radar sensor
Fig. 144
Mounting location of the radar
sensor
Read and observe and on page 122 first.
The radar sensor » Fig. 144(hereinafter referred to as "sensor") may detect ob-
jects by radiating and receiving electromagnetic waves.
The sensor function may be impaired in the events of one of the following. ▶ The sensor is soiled by mud, snow and the like.
▶ The area in front and around the sensor is obscured by labels, auxiliary lights
and similar.
▶ When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
If the sensor is dirty or covered, the corresponding message appears on the
display of the instrument cluster » page 125, Information messages .
WARNING■
If you suspect that the sensor is damaged, deactivate the system. Have
the sensor checked by a specialist garage.■
The sensor can become misaligned by collisions or by damage to the front
of the vehicle, the wheel arch or the underside of the vehicle. This can lead
to impaired function of the sensor - risk of accidents! Have the sensor
checked by a specialist garage.
■
The area in front and around the senor should not be obscured by labels,
auxiliary lights and similar. This can lead to impaired function of the sensor
- risk of accidents!
122Driving