Driving and operating115Vehicle shutdown
Fuel cut-off system
If the vehicle runs out of fuel, the fuel system is cut-off and must be reset
after refuelling. A corresponding
warning message may also appear in the Driver Information Centre 3 88.9 Danger
If you can smell fuel in the vehicle,
or a fuel leak is present, have thecause of this remedied
immediately by a workshop. Do
not reset the fuel cut-off system, to avoid the risk of fire.
Resetting with remote control
key / manual key
To reset the fuel cut-off system and
enable the vehicle to be driven:
1. Turn the ignition key to position M
3 112.
2. Wait a few minutes to allow the fuel system to be reset.
3. Turn key to position D to start the
engine.
If the engine does not start, repeat the procedure.
Resetting with electronic keysystem
To reset the fuel cut-off system and
enable the vehicle to be driven:
1. Insert the electronic key in the card reader 3 112.
2. Press the engine start/stop button
without depressing any pedals.
3. Wait a few minutes to allow the fuel system to be reset.
If the engine does not start, repeat the procedure.
Electronic key system 3 21.Power button 3 112.
Refuelling 3 132.
Overrun 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 restarts the engine
automatically as soon as the clutch pedal is depressed.
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.
116Driving and operating
Deactivation
Deactivate the stop-start system
manually by pressing the Î button.
LED in the button illuminates to
indicate deactivation and a
corresponding message appears in
the Driver Information Centre 3 88.
If deactivated manually, it is possible to reactivate the stop-start system by
pressing the Î button again.
Vehicle messages 3 89.
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 when Ï
illuminates in the instrument cluster
3 87.
During an Autostop, brake
performance will be maintained.
However, brake assist is not available
3 121.
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 bonnet is fully closed.
■ the vehicle battery is sufficiently charged and in good condition.
■ the engine is warmed up.
■ the engine coolant temperature is not too high.
■ the outside temperature is not too low or too high (e.g. below 0 °C orabove 30 °C).
■ the brake vacuum is sufficient. ■ the defrosting function is not activated 3 101.
120Driving and operatingBrakes
The brake system comprises two
independent brake circuits.
If a brake circuit fails, the vehicle can
still be braked using the other brake
circuit. However, braking effect is
achieved only when you depress the
brake pedal firmly. You need to use
considerably more force for this. The
braking distance is extended. Seek
the assistance of a workshop before
continuing your journey.
When the engine is not running, the
support of the brake servo unit
disappears once the brake pedal has been depressed once or twice.
Braking effect is not reduced, but
braking requires significantly greater
force. It is especially important to bear this in mind when being towed.
If control indicator R illuminates in
the instrument cluster while driving and a corresponding message
appears in the Driver Information
Centre, there is a fault in the braking
system. Seek the assistance of a
workshop immediately.Control indicator R 3 85.
Vehicle messages 3 89.
Antilock brake system
Antilock brake system (ABS)
prevents the wheels from locking.
ABS starts to regulate brake pressure as soon as a wheel shows a tendency to lock. The vehicle remains
steerable, even during hard braking.
ABS control is made apparent
through a pulse in the brake pedal
and the noise of the regulation
process.
For optimum braking, keep the brake
pedal fully depressed throughout the
braking process, despite the fact that the pedal is pulsating. Do not reduce
the pressure on the pedal.
Control indicator u 3 85.
Fault
If control indicator u does not go out
a few seconds after the ignition is
switched on, or if it illuminates while driving, there is a fault in the ABS.
Control indicator F 3 84 may alsoilluminate in the instrument cluster
together with a corresponding
message in the Driver Information
Centre. The brake system remains
operational but without ABS
regulation.9 Warning
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.
If control indicators u, F , R 3 85
and C 3 84 illuminate, there is a fault
in the braking system. A
corresponding message also
appears in the Driver Information
Centre 3 88. Have the cause of the
fault remedied by a workshop.
Vehicle messages 3 89.
122Driving and operatingRide control systems
Traction Control system
The Traction Control system (TC) is a
component part of the Electronic
Stability Program (ESP® Plus
) which
improves driving stability when
necessary, regardless of the type of
road surface or tyre grip, by
preventing the drive wheels from
spinning.
As soon as the drive wheels starts to spin, engine output is reduced and
the wheel spinning the most is braked
individually. This considerably
improves the driving stability of the
vehicle on slippery road surfaces.
TC is operational as soon as the
ignition is switched on and control
indicator b extinguishes in the
instrument cluster. A corresponding
message also appears in the Driver
Information Centre 3 88.
When TC is active b flashes.9 Warning
Do not let this special safety
feature tempt you into taking risks
when driving.
Adapt speed to the road
conditions.
Control indicator b 3 85.
Trailer stability assist (TSA) 3 135.
Enhanced Traction function
If necessary, in the event of soft
ground, mud or snow-covered road
surfaces, the Traction control system
(TC) can be deactivated to enhance
traction:
Press the Ø button on the
instrument panel.
Control indicator Ø illuminates in the
instrument cluster and a
corresponding message appears in
the Driver Information Centre 3 88.
When vehicle speed reaches 30 mph, the system switches
automatically from Enhanced
Driving and operating123
Traction function to TC operation.
Control indicator Ø extinguishes in
the instrument cluster.
TC is reactivated by pressing the Ø
button again. Control indicator Ø
extinguishes.
TC is also reactivated the next time
the ignition is switched on.
Fault If the system detects a fault, control
indicator b 3 85 illuminates together
with F 3 84 in the instrument cluster
and a corresponding message
appears in the Driver Information
Centre 3 88.
TC is not operational. Have the cause of the fault remedied by a workshop.
Vehicle messages 3 89.
Electronic stability
program
The Electronic Stability Program
(ESP® Plus
) improves driving stability
when necessary, regardless of thetype of road surface or tyre grip. It also
prevents the drive wheels from
spinning.
As soon as the vehicle starts to
swerve (understeer/oversteer),
engine output is reduced and the
wheels are braked individually. This
considerably improves the driving
stability of the vehicle on slippery road
surfaces.
ESP® Plus
is operational as soon as
the ignition is switched on and control
indicator b extinguishes in the
instrument cluster. A corresponding message also appears in the Driver
Information Centre 3 88.
When ESP® Plus
comes into action b
flashes.9 Warning
Do not let this special safety
feature tempt you into taking risks
when driving.
Adapt speed to the road
conditions.
Control indicator b 3 85.
Trailer stability assist (TSA) 3 135.
Enhanced Traction function
If necessary, in the event of soft
ground, mud or snow-covered road
surfaces, ESP® Plus
can be
deactivated to enhance traction:
Press the Ø button on the
instrument panel.
124Driving and operating
Control indicator Ø illuminates in the
instrument cluster and a
corresponding message appears in
the Driver Information Centre 3 88.
When vehicle speed reaches 30 mph, the system switches
automatically from Enhanced
Traction function to ESP® Plus
operation. Control indicator Ø
extinguishes in the instrument cluster.
ESP® Plus
is reactivated by pressing
the Ø button again. Control indicator
Ø extinguishes.
ESP® Plus
is also reactivated the next
time the ignition is switched on.
Fault
If the system detects a fault, control indicator b 3 85 illuminates together
with F 3 84 in the instrument cluster
and a corresponding message
appears in the Driver Information
Centre 3 88.
The Electronic stability program
(ESP® Plus
) is not operational. Have
the cause of the fault remedied by a
workshop.
Vehicle messages 3 89.Driver assistance
systems9 Warning
Driver assistance systems are
developed to support the driver
and not to replace the driver's
attention.
The driver accepts full
responsibility when driving the
vehicle.
When using driver assistance
systems, always take care
regarding the current traffic
situation.
Cruise control
The cruise control can store and
maintain speeds of 20 mph and
above. Deviations from the stored speeds may occur when driving uphill or downhill.
For safety reasons the cruise control cannot be activated until the foot
brake has been operated once.
Driving and operating125
Do not use the cruise control if it is notadvisable to maintain a constant
speed.
Control indicators U and m 3 87.
Activation
Press switch m, control indicator U
illuminates green in the instrument
cluster.
Cruise control is now in standby mode
and a corresponding message
appears in the Driver Information
Centre.
Accelerate to the desired speed and
press switch < or ]. The current
speed is now stored and maintained and the accelerator pedal can be
released.Control indicator m illuminates green
in the instrument cluster together with
U and a corresponding message
appears in the Driver Information
Centre.
Vehicle speed can be increased by depressing the accelerator pedal.
The stored speed flashes in the
instrument cluster. When the
accelerator pedal is released, the
previously stored speed is resumed.
Cruise control remains activated
while gearshifting.
The speed is saved until the ignition
is switched off.
Driving and operating129
ActivationWhen reverse gear is engaged, the
system switches itself on
automatically. Readiness for
operation is indicated by a brief
acoustic signal.
An obstacle is indicated by buzzers
and, depending on vehicle, is also
indicated in the Info-Display. The
interval between the buzzers
becomes shorter as the vehicle gets
closer to the obstacle. When the
distance is less than 30 cm, the buzzer is continuous.
Notice
In versions with Info-Display
indication, the volume of the buzzer
can be adjusted via the Infotainment
system. Refer to Infotainment
system manual for further
information.9 Warning
Under certain circumstances,
various reflective surfaces on
objects or clothing as well as
external noise sources may cause the system to fail to detect
obstacles.
Deactivation
Deactivate the system by pressing
the r button on the instrument
panel with the ignition on. LED
illuminates in the button when
deactivated. When reverse gear is
selected, no acoustic signal will
sound.
Notice
In versions with Info-Display
indication, the function can be
deactivated via the Infotainment
system. Refer to Infotainment
system manual for further
information.
The function is reactivated by
pressing button r again or the next
time the ignition is switched on.
Fault If the system detects an operating
fault, when selecting reverse gear a
continuous acoustic alarm will sound
for approx. 5 seconds, a
corresponding message appears in
the Driver Information Centre 3 88
and F illuminates in the instrument
cluster 3 84. Consult a workshop to
have the cause of the fault remedied.