108LightingBattery discharge protection
Vehicle battery state of charge
function
The function guarantees longestvehicle battery life via a generator
with controllable power output and
optimised power distribution.
To prevent discharge of the vehicle
battery when driving, the following
systems are reduced automatically in two stages and finally switched off:
● auxiliary heater
● heated rear window and heated mirrors
● heated seats
● fan
In the second stage, a message
which confirms the activation of the
vehicle battery discharge protection
will be displayed in the Driver
Information Centre.Switching off interior lights
To prevent discharge of the vehicle
battery when the ignition is switched off, some interior lights are switched
off automatically after some time.
Climate control109Climate controlClimate control systems.............109
Heating and ventilation system 109
Air conditioning system ...........110
Electronic climate control system .................................... 113
Auxiliary heater ........................117
Air vents ..................................... 118
Adjustable air vents .................118
Fixed air vents ......................... 119
Maintenance .............................. 119
Air intake ................................. 119
Air conditioning regular operation ................................ 119
Service .................................... 119Climate control systems
Heating and ventilation system
Controls for: ● temperature £
● air distribution l, M and K
● fan speed Z
● demisting and defrosting à
● heated rear window and heated exterior mirrors b
● heated windscreen ,
● heated seats ß
Temperature £
Adjust the temperature by turning
£ to the desired temperature.red area:warmerblue area:colder
Heating will not be fully effective until
the engine has reached normal
operating temperature.
Air distribution l M K
Press:
l:to windscreen and front door
windowsM:to head area and rear seats via
adjustable front air ventsK:to front and rear foot well and
windscreen
Combinations are possible.
Fan speed Z
Adjust the air flow by turning Z to the
desired speed.
Climate control117Demisting and defrosting the
windows à
● Press à. The LED in the button
illuminates to indicate activation.
● Temperature and air distribution are set automatically and the fan
runs at high speed.
● Switch on cooling by pressing A/C , if required.
● Switch on heated rear window b.
● Switch on heated windscreen ,.
● To return to previous mode press
à again, to return to automatic
mode press AUTO.
Note
If à is pressed while the engine is
running, an Autostop will be inhibited until à is pressed again.
If à is pressed while the engine is in
an Autostop, the engine will restart
automatically.
Stop-start system 3 126.
Deactivation of electronic climate control system
Cooling, fan and automatic mode can
be switched off by turning control dial
Z anticlockwise.
Activation by switching on the fan or
pressing AUTO.
Heated rear window b 3 38.
Heated exterior mirrors b 3 34.
Heated windscreen , 3 38.
Heated seats ß 3 44.Auxiliary heater
Air heater
Quickheat is an electric auxiliary air
heater which automatically warms up
the passenger compartment more
quickly.
Driving and operating125●Do not operate accelerator pedal.
● Diesel engines: wait until control indicator ! extinguishes.
● Turn key to position 2 and
release after the engine has been started.
Manual transmission: during an
Autostop, the engine can be started
by depressing the clutch pedal
3 126.
Automatic transmission: during an
Autostop, the engine can be started
by releasing the brake pedal 3 126.
Vehicles with power button● Manual transmission: operate clutch and brake pedal.
● Automatic transmission: operate brake pedal and move selector
lever to P or N.
● Do not operate accelerator pedal.
● Press Start/Stop button. Release
button after starting procedure
begins.
● Diesel engine starts after control indicator ! for preheating
extinguishes.
● Before restarting or to switch off the engine when vehicle is
stationary, press Start/Stop once
more briefly.
To start the engine during an
Autostop:
● Manual transmission: during an Autostop, the engine can be
started by depressing the clutch
pedal 3 126.
● Automatic transmission: during an Autostop, the engine can be
started by releasing the brake
pedal 3 126.Starting the vehicle at low
temperatures
Starting the engine without additional
heaters is possible down to -25 °С for diesel engines and -30 °C for petrol
engines.
Required is an engine oil with the
correct viscosity, the correct fuel,
performed services and a sufficiently
charged vehicle battery.
With temperatures below -30 °C the
automatic transmission requires a
warming phase of approx. 5 minutes.
The selector lever must be in position
P .Caution
Under extreme cold temperatures,
idle engine for maximum
5 minutes otherwise the engine
might be damaged.
Driving and operating127The engine will be switched off whilethe ignition stays on.Vehicles with automatic transmission
If the vehicle is at a standstill with
depressed brake pedal, Autostop is
activated automatically.
The engine will be switched off while
the ignition stays on.
The stop-start system will be disabled
on inclines of 12% or more.
Indication
An Autostop is indicated by control
indicator D.
During an Autostop, the heating and
brake performance will be
maintained.
Conditions for an Autostop
The stop-start system checks if each
of the following conditions is fulfilled.
● The stop-start system is not manually deactivated.
● The driver's door is closed or the driver's seat belt is fastened.
● The vehicle battery is sufficiently charged and in good condition.
● The engine is warmed up.
● The engine coolant temperature is not too high.
● The engine exhaust temperature is not too high, e.g. after driving
with high engine load.
● The ambient temperature is not too low or too high.
● The climate control system allows an Autostop.
● The brake vacuum is sufficient.
● The self-cleaning function of the exhaust filter is not active.
● The vehicle was driven at least at
walking speed since the last
Autostop.
Otherwise an Autostop will be
inhibited.Note
The Autostop may be inhibited for
several hours after a battery
replacement or reconnection.
Certain settings of the climate control
system may inhibit an Autostop. See
Climate control chapter for more
details 3 110.
If an autostop is temporarily not
available, D flashes green 3 86.
Immediately after driving at a higher
speed an Autostop may be inhibited.
Vehicle battery discharge protection
To ensure reliable engine restarts,
several vehicle battery discharge
protection features are implemented
as part of the stop-start system.
Power saving measures
During an Autostop, several electrical
features such as auxiliary electric
heater or rear window heating are
disabled or switched to a power
saving mode. The fan speed of the
climate control system is reduced to
save power.
Driving and operating131Caution
Avoid contact of the paintwork withAdBlue.
In case of contact, rinse off with water.
AdBlue freezes at a temperature of
approx. -11 °C. As the vehicle is
equipped with an AdBlue pre-heater,
the emissions reduction at low
temperatures is ensured. The AdBlue
pre-heater works automatically.
Level warnings
The AdBlue consumption is approx.
1.5 l per 1000 km. The consumption
can be higher depending on driving
behaviour (e.g. high load or towing).
Depending on the calculated range of
AdBlue, different messages are
displayed in the Driver Information
Centre. The messages and the
restrictions are a legal requirement.
The first possible warning message
appears at an AdBlue range below
2400 km, shows up at each start and
each 300 km range reduction:
Top up AdBlue: Starting impossible in 2400 km
Additionally, control indicator Y
illuminates continuously and a chime
sounds with every message pop-up.
At an AdBlue range below 600 km,
the following warning message is
being displayed, shows up at each
start and each 20 km range reduction:
Top up AdBlue: Starting impossible in
600 km
Additionally, control indicator Y
flashes continuously and a chime sounds with every message pop-up.
Note
In case of high AdBlue consumption, the Driver Information Centre may
display this warning without the
previous warning stages.
The last warning level is entered
when the AdBlue tank is empty.
Restart of the engine is not possible.
The following warning message is
being displayed and cannot be
dismissed:
Top up AdBlue: Starting impossibleAdditionally, control indicator Y
flashes continuously and engine cannot be restarted until AdBlue tank
is being filled with at least 5 l.
High emission warnings
If the exhaust emission rises above a certain value, warnings similar to the
range warnings will be displayed in
the Driver Information Centre.
Requests to have the exhaust system
checked and finally the
announcement of the prevention of
an engine restart are displayed.
These restrictions are a legal
requirement.
Consult a workshop for assistance.
Refilling AdBlueCaution
Only use AdBlue that complies
with European standards
DIN 70 070 and ISO 22241-1.
Do not use additives.
Driving and operating167
The use of B20 or B30 fuel meetingstandard EN16709 is possible.
However, this use, even occasional, requires strict application of the
special servicing conditions referred
to as "arduous conditions".
For further information, contact a
workshop.
Caution
The use of any other type of (bio)
fuel (vegetable or animal oils, pure
or diluted, domestic fuel etc.) is
strictly prohibited (risk of damage
to the engine and fuel system).
Note
The only diesel additives authorised
for use are those that meet the
B715000 standard.
Low temperature operation
At temperatures below 0 °C, some
diesel products with biodiesel blends may clog, freeze or gel, which may
affect the fuel supply system. Starting
and engine operation may not work
properly. Make sure to fill winter
grade diesel fuel at ambient
temperatures below 0 °C.
Arctic grade diesel fuel can be used
in extreme cold temperatures below
-20 °C. Using this fuel grade in warm
or hot climates is not recommended
and may cause engine stalling, poor
starting or damage on the fuel
injection system.Refuelling9 Danger
Before refuelling, switch off
ignition and any external heaters
with combustion chambers.
Follow the operating and safety
instructions of the filling station
when refuelling.
246IndexAAccessories and vehicle modifications .......................... 174
Active emergency braking ....87, 147
AdBlue .......................... 85, 130, 230
Adjustable air vents ...................118
Advanced parking assist ............153
Airbag and belt tensioners ...........82
Airbag deactivation ................54, 82
Airbag label................................... 49 Airbag system .............................. 49
Air conditioning regular operation ................................ 119
Air conditioning system .............. 110
Air intake .................................... 119
Air vents...................................... 118
Antilock brake system ................ 137
Antilock brake system (ABS) .......84
Anti-theft alarm system ................31
Anti-theft locking system .............. 30 Appearance care ........................210
Armrest ............................. 44, 45, 62
Ashtrays ....................................... 76
Automatic anti-dazzle ..................35
Automatic crash notification (ACN) 98
Automatic light control ...............101
Automatic locking ........................28
Automatic transmission .............133
Autostop ............................... 86, 126
Auxiliary heater ........................... 117B
Battery discharge protection ......108
Belts.............................................. 46
BlueInjection ............................... 130
Bonnet ....................................... 176
Brake and clutch system .............83
Brake assist ............................... 139
Brake fluid .......................... 179, 219
Brake light................................... 185
Brakes ............................... 137, 179
Breakdown.................................. 208
Bulb replacement ....................... 182
C Capacities .................................. 230
Catalytic converter .....................130
Central locking system ................23
Centre console lighting ..............107
Centre console storage ...............62
Changing tyre and wheel size ...198
Charging system .......................... 82
Child locks ................................... 28
Child restraint installation locations ................................... 58
Child restraints.............................. 55
Child restraint systems ................55
Cigarette lighter ........................... 76
Climate control ............................. 15
Climate control systems .............109
Clock............................................. 74