142Driving and operatingOverrun cut-off
The fuel supply is automatically cut off
during overrun, i.e. when the vehicle
is driven with a gear engaged but
accelerator is released.
Stop-start system The stop-start system helps to save
fuel and to reduce the exhaust
emissions. When conditions allow, it
switches off the engine as soon as the
vehicle is at a low speed or at a
standstill, e.g. at a traffic light or in a
traffic jam. It starts the engine
automatically as soon as the clutch is depressed. A vehicle battery sensor
ensures that an Autostop is only
performed if the vehicle battery is
sufficiently charged for a restart.
Activation The stop-start system is available as
soon as the engine is started, the
vehicle starts-off and the conditions
as stated below in this section are
fulfilled.Deactivation
Deactivate the stop-start system
manually by pressing eco. The
deactivation is indicated when the
LED in the button extinguishes.
Autostop If the vehicle is at a low speed or at a
standstill, activate an Autostop as
follows:
● Depress the clutch pedal.
● Move the selector lever to neutral.
● Release the clutch pedal.
The engine will be switched off while
the ignition stays on.
An Autostop is indicated by the
needle at the AUTOSTOP position in
the tachometer.
During an Autostop, the heating and
brake performance will be
maintained.
Caution
The steering assist will be reduced
during an Autostop.
Driving and operating143Conditions 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 bonnet is fully closed.
● 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 above -5 °C.
● The defrost selection does not inhibit an Autostop.
● The climate control system allows an Autostop.
● The brake vacuum is sufficient.● The self-cleaning function of the diesel particle filter is not active.
● The vehicle was driven at least at
walking speed since the last
Autostop.
Otherwise an Autostop will be
inhibited.
An Autostop may become less
available as the ambient temperature
approaches the freezing point.
Certain settings of the climate control
system may inhibit an Autostop. See
" Climate control " chapter for further
information 3 132.
Immediately after motorway driving
an Autostop may be inhibited.
New vehicle running-in 3 140.
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 aredisabled or switched into a power
saving mode. The fan speed of the
climate control system is reduced to
save power.
Restart of the engine by the driver
Depress the clutch pedal to restart the
engine.
The engine start is indicated by the
needle at the idle speed position in
the tachometer.
If the selector lever is shifted out of
neutral before depressing the clutch
first, control indicator - illuminates
or is shown as a symbol in the Driver Information Centre.
Control indicator - 3 96.
Restart of the engine by the stop- start system
The selector lever must be in neutral to enable an automatic restart.
If one of the following conditions occurs during an Autostop, the
engine will be restarted automatically by the stop-start system.
Driving and operating149If the vehicle battery is not the cause
of the fault, release the selector lever.
1. Apply the parking brake.
2. Hold the selector lever trim at the marked position and pull tounlatch at the back.
3. Fold the selector lever trim upwards. Pull to unlatch at the
front.
4. Move the selector lever trim to the
left. Take care that the plug and
the wiring harness at the bottom are not damaged.
5. Insert a screwdriver into the opening as far as it will go and
move the selector lever out of P or
N . If P or N is engaged again, the
selector lever will be locked in
position again. Have the cause of
the power supply interruption
remedied by a workshop.
6. Mount the selector lever trim onto
the centre console and refit.
Manual transmission
To engage reverse, depress the
clutch pedal and press the release button on the selector lever and
engage the gear.
If the gear does not engage, set the
lever to neutral, release the clutch
pedal and depress again; then repeat
gear selection.
Do not slip the clutch unnecessarily.
When operating, depress the clutch
pedal completely. Do not use the
pedal as a foot rest.
Driving and operating151Fault9Warning
If there is a fault in the ABS, the
wheels may be liable to lock due
to braking that is heavier than
normal. The advantages of ABS are no longer available. During
hard braking, the vehicle can no longer be steered and may
swerve.
Have the cause of the fault remedied
by a workshop.
Parking brake
Electric parking brake
Applying when vehicle is stationary
9 Warning
Pull switch m for approx. one
second, the electric parking brake
operates automatically with an
adequate force. For maximum
force, e.g. parking with trailer or on
inclines, pull switch m twice.
The electric parking brake is
applied when control indicator m
illuminates 3 97.
The electric parking brake can always
be activated, even if the ignition is off.
Do not operate electric parking brake
system too often with engine not
running as this will discharge the
vehicle battery.
Before leaving the vehicle, check the electric parking brake status.
Control indicator m 3 97.
Releasing
Switch on ignition. Keep brake pedal
depressed and then push switch m.
Drive away function
Vehicles with manual transmission:
Depressing the clutch pedal and then
slightly releasing the clutch pedal and
slightly depressing the accelerator
pedal releases the electric parking
Driving and operating155
Do not use the cruise control if it is notadvisable to maintain a constant
speed.
With automatic transmission, only
activate cruise control in automatic
mode.
Control indicator m 3 100.
Switching on
Press rocker switch m at the upper
end, control indicator m illuminates
white.
Activation
Accelerate to the desired speed and
turn thumb wheel to SET/-, the
current speed is stored and
maintained. Control indicator m
illuminates green. Accelerator pedal
can be released.
Vehicle speed can be increased by
depressing the accelerator pedal.
When the accelerator pedal is
released, the previously stored speed
is resumed.
Cruise control remains activated
while gearshifting.
Increase speed With cruise control active, hold thumb
wheel turned to RES/+ or briefly turn
to RES/+ repeatedly: speed
increases continuously or in small
increments.
Alternatively accelerate to the desired speed and store by turning to RES/+.Reduce speed
With cruise control active, hold thumb wheel turned to SET/- or briefly turn to
SET/- repeatedly: speed decreases
continuously or in small increments.
Deactivation Press y, control indicator m
illuminates white. Cruise control is
deactivated. Last stored speed
remains in memory for later speed
resume.
Automatic deactivation: ● Vehicle speed is below approx. 30 km/h.
● The brake pedal is depressed.
● The clutch pedal is depressed for
a few seconds.
● Selector lever is in N.
● Engine speed is in a very low range.
● The Traction Control system or Electronic Stability Control is
operating.
Vehicle care177
The brake fluid level must be betweenthe MIN and the MAX marks.
When topping up, ensure maximum cleanliness as contamination of the
brake fluid can lead to brake system
malfunctions. Have the cause of the
loss of brake fluid remedied by a
workshop.
Only use high-performance brake
fluid approved for the vehicle.
Brake and clutch fluid 3 221.
Vehicle battery
The vehicle battery is maintenance-
free provided that the driving profile
allows sufficient charging of the
battery. Short-distance-driving and
frequent engine starts can discharge
the battery. Avoid the use of
unnecessary electrical consumers.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Laying up the vehicle for more than
four weeks can lead to battery
discharge. Disconnect the clamp from the negative terminal of the vehicle
battery.
Ensure the ignition is switched off
before connecting or disconnecting
the vehicle battery.
Vehicle battery discharge protection
3 128.
Replacing the vehicle battery
Note
Any deviation from the instructions
given in this paragraph may lead to
a temporary deactivation of the stop-
start system.
When the vehicle battery is being
replaced, please ensure that there
are no open ventilation holes in the
vicinity of the positive terminal. If a
ventilation hole is open in this area, it
must be closed off with a dummy cap, and the ventilation in the vicinity of the
negative terminal must be opened.
Only use vehicle batteries that allow
the fuse box to be mounted above the vehicle battery.
In vehicles with an AGM (Absorptive
Glass Mat) battery, make sure to
have the battery replaced with
another AGM battery.
222Service and maintenanceAdditional engine oil additives
The use of additional engine oil
additives could cause damage and
invalidate the warranty.
Engine oil viscosity grades
The SAE viscosity grade gives
information of the thickness of the oil.
Multigrade oil is indicated by two
figures, e.g. SAE 5W-30. The first
figure, followed by a W, indicates the
low temperature viscosity and the
second figure the high temperature viscosity.
Select the appropriate viscosity grade
depending on the minimum ambient
temperature 3 225.
All of the recommended viscosity
grades are suitable for high ambient
temperatures.
Coolant and antifreeze
Use only organic acid type-long life
coolant (LLC) antifreeze approved for
the vehicle. Consult a workshop.
The system is factory filled with
coolant designed for excellent
corrosion protection and frost
protection down to approx. -28 °C. Innorthern countries with very low
temperatures the factory filled coolant provides frost protection down to
approx. -37 °C. This concentration
should be maintained all year round.
The use of additional coolant
additives that intend to give additional
corrosion protection or seal against
minor leaks can cause function
problems. Liability for consequences
resulting from the use of additional coolant additives will be rejected.
Brake and clutch fluidOver time, brake fluid absorbs
moisture which will reduce braking
effectiveness. The brake fluid should therefore be replaced at the specified
interval.
244IndexAAccessories and vehicle modifications .......................... 172
Active head restraints ...................36
Adaptive brake light ....................150
Adaptive forward lighting ..100,
123, 182
Adjustable air vents ...................136
Airbag and belt tensioners ...........95
Airbag deactivation ................53, 95
Airbag label................................... 49 Airbag system .............................. 49
Air conditioning regular operation ................................ 137
Air conditioning system .............. 130
Air intake .................................... 137
Air vents...................................... 136
Alert ............................................ 108
Antifreeze ................................... 175
Antilock brake system ................ 150
Antilock brake system (ABS) .......97
Anti-theft alarm system ................28
Anti-theft locking system .............. 28
Appearance care ........................216
Armrest ................................... 40, 43
Armrest storage ........................... 63
Ashtrays ....................................... 88
Automatic anti-dazzle ..................31
Automatic light control ...............121
Automatic locking ................25, 100Automatic transmission .............146
Autostop ..................................... 142
Auxiliary heater ........................... 136
B Battery discharge protection ......128
Battery voltage ........................... 109
Belts.............................................. 45 Bicycle rack .................................. 64
Bonnet ....................................... 173
Brake and clutch fluid .................221
Brake and clutch system .............96
Brake assist ............................... 152
Brake fluid .................................. 176
Brakes ............................... 150, 176
Breakdown.................................. 214
Bulb replacement ....................... 180
C Capacities .................................. 234
Car Pass ...................................... 21
Catalytic converter .....................146
Central locking system ................22
Centre console lighting ..............127
Changing tyre and wheel size ...201
Charging system .......................... 96
Child locks ................................... 26
Child restraint installation locations ................................... 57
Child restraints.............................. 55
Child restraint systems ................55