Page 24 of 219
22In briefActive head restraints on
front seats
In the event of a rear-end impact, the active head restraints tilt forwards
slightly. The head is more effectively
supported by the head restraint and
the risk of whiplash injury is reduced.
Active head restraints can be
recognised by the word ACTIVE.
Head restraints 3 43.
Trip computer
Functions:
■ Range
■ Instantaneous consumption
■ Distance
■ Average speed
■ Absolute consumption
■ Average consumption
■ Stop watch
■ Tyre pressure
Trip computer 3 103, 3 105.
Check control
The check control monitors:
■ Fluid levels
■ Tyre pressure
■ Radio remote control battery
■ Anti-theft alarm system
■ Important exterior lighting bulbs, including cables and fuses.
Display messages 3 101.
Page 91 of 219

Instruments and controls89
Illuminates when the engine is
running Fault in the emission control system.
The permitted emission limits may be
exceeded. Immediately seek the
assistance of a workshop.
Flashes when the engine is
running
Fault that could lead to catalytic
converter damage. Ease up on the
accelerator until the flashing stops.
Seek the assistance of a workshop
immediately.
Service vehicle soon A illuminates or flashes yellow.
Illuminates when the engine is running Fault in engine or transmission
electronics 3 133, 3 137. The
electronics switch to an emergency
running programme. Fuel
consumption may be increased and
the vehicle handling may be impaired.If the fault persists after restarting the vehicle, consult a workshop.
Illuminates together with InSP4in the service display
Seek the assistance of a workshop for
draining the diesel fuel filter 3 102.
Flashes with switched on
ignition
Fault in the immobiliser system. The engine cannot be started 3 36.
Switch off the ignition and repeat the
start attempt.
If the control indicator continues
flashing, attempt to start the engine
using the spare key and seek the
assistance of a workshop.
Brake and clutch system R illuminates or flashes red.
Illuminated
Illuminates when the parking brake is released if the brake and clutch fluidlevel is too low 3 157.9 Warning
Stop. Do not continue your
journey. Consult a workshop.
Illuminates after the ignition is
switched on if the parking brake is
applied 3 140.
Flashes
On vehicles with manual transmission
automated, flashes for a few seconds
when the ignition is switched off if the parking brake is not applied.
On vehicles with manual transmission
automated, flashes when the driver's
door is opened if no gear is engaged
and the parking brake is not applied.
Antilock brake system
(ABS) u illuminates red.
Illuminates for a few seconds after the ignition is turned on. The system is
ready for operation when the control indicator goes out.
Page 92 of 219

90Instruments and controls
If the control indicator does not go outafter a few seconds, or if it illuminates while driving, there is a fault in the
ABS. The brake system remains
operational but without ABS
regulation.
Antilock Brake System 3 139.
Upshift
[ illuminates green when upshifting
is recommended for fuel saving
reasons.
Sport mode1 illuminates yellow.
The symbol is illuminated when Sport
mode is on 3 132, 3 136.
Winter mode T illuminates yellow.
The symbol is illuminated when
Winter mode is on 3 132, 3 136.
Ultrasonic parking assist
r illuminates or flashes yellow.Illuminates
Fault in system. Have the cause of the
fault remedied by a workshop.
Flashes
Fault due to sensors that are dirty or
covered by ice or snow.
or
Interference due to external sources of ultrasound. Once the source of
interference is removed, the system
will operate normally.
Ultrasonic parking sensors 3 143.
Electronic Stability
Program v flashes or illuminates yellow.
Illuminates for a few seconds when
the ignition is switched on.
Flashes whilst driving
The system is actively engaged.
Engine output may be reduced and
the vehicle may be braked
automatically to a small degree
3 140.Illuminates whilst driving
The system is switched off or a fault
is present. Continued driving is
possible. Driving stability, however,
may deteriorate depending on road
surface conditions.
Have the cause of the fault remedied
by a workshop.
ESP® Plus
3 140.
Engine coolant
temperature W illuminates red.
Illuminates when the engine is
running
Stop, switch off engine.Caution
Coolant temperature too high.
Check coolant level. 3 155.
If there is sufficient coolant, consult a workshop.
Page 105 of 219
Instruments and controls103Washer fluid level
Low washer fluid level. Top up
washer fluid 3 156.Trip computer
Trip computer in Board-
Info-Display Access the data by pressing the BC
button on the Infotainment system or
the left adjuster wheel on the steering
wheel.
Some information appears in the
display in an abbreviated form.
Once an audio function has been
selected, the lower row of the trip computer function is displayed
furthermore.Instantaneous consumption
Displays the instantaneous
consumption. At low speeds,
consumption per hour is displayed.
Average consumption
Displays average consumption. The
measurement can be reset at any
time.
Absolute consumption
Displays fuel consumed. The
measurement can be reset at any
time.
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104Instruments and controls
Average speed
Displays average speed. The
measurement can be reset at any
time.
Stoppages in the journey with the
ignition off are not included in the
calculations.
Distance
Displays distance travelled. The
measurement can be reset at any
time.
RangeRange is calculated from current fuel
tank content and current
consumption. The display shows
average values.
After refuelling, the range updates automatically after a brief delay.
When the fuel level in the tank is low,
the message Range appears in the
display.
When the fuel tank is nearly empty,
the message Refuel! appears in the
display.
Stop watchSelect the function. Press the OK
button or the left adjuster wheel on the
steering wheel to start or stop the stop watch.
Restart trip computer
The measurement or calculation of
the following trip computer
information can be restarted:
■ Average consumption,
■ Absolute consumption,
■ Average speed,
■ Distance,
■ Stop watch.
Select the desired trip computer
information 3 94 . To restart, press the
OK button or the left adjuster wheel
on the steering wheel for approx.
2 seconds.
Page 108 of 219
106Instruments and controls
DistanceDisplays distance travelled. The
measurement can be reset at any
time.
Average speed
Displays average speed. The
measurement can be reset at any
time.
Stoppages in the journey with the
ignition off are not included in the
calculations.
Absolute consumption
Displays fuel consumed. The
measurement can be reset at any
time.
Average consumption
Displays average consumption. The
measurement can be reset at any
time.
Restart trip computer
The measurement or calculation of
the following trip computer
information can be restarted:
■ Distance,
■ Average speed,
■ Absolute consumption,
■ Average consumption.
Select BC 1 or BC 2 from the Board
Computer menu.
The information of the two trip
computers can be reset separately,
making it possible to evaluate data
from different time periods.
Select the required trip computer
information and confirm.
Page 141 of 219

Driving and operating139Brakes
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.
Control indicator R 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 though 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.
After starting off the system performs
a self-test which may be audible.
Control indicator u 3 89.
Adaptive brake lamp During full braking, all three brake
lamps flash for the duration of ABS
control.Fault9 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.
Have the cause of the fault remedied
by a workshop.
Page 143 of 219

Driving and operating1419Warning
Do not let this special safety
feature tempt you into taking risks
when driving.
Adapt speed to the road
conditions.
Control indicator v 3 90.
Deactivation
ESP® Plus
can be deactivated when
Sport mode is engaged for high-
performance driving:
Hold the SPORT button depressed
for about 4 seconds. Control indicator v illuminates. ESPoff also appears in
the service display.9 Warning
Do not deactivate ESP® Plus
if a
run-flat tyre has lost pressure.
ESP® Plus
is reactivated by pressing
the SPORT button. ESPon appears in
the service display. ESP® Plus
is also
reactivated the next time the ignition is switched on.
Sport mode 3 141.
Interactive driving system Interactive driving system (IDS Plus
)
combines the electronic stability
program (ESP® Plus
) with the antilock
brake system (ABS) and continuous damping control (CDC) to improve
driving dynamics and vehicle safety.
Sport mode
Suspension and steering become
more direct and provide better
contact with the road surface. The
engine reacts more quickly to
accelerator pedal movements.
Automatic gear changing is also more
responsive.
Control indicator IDSPlus
3 91.
Activation
Press SPORT button.
Control indicator 1 3 90.
Winter programme activation not
possible.