Page 206 of 331

204Driving and operating
Warning symbols
Warning symbols are indicated as
triangles 9 on the picture which show
obstacles detected by the rear
sensors of the advanced parking
assist.
Additionally 9 appears on the top line
of the Info-Display with the warning to check the vehicle surrounding.
Deactivation
The camera is deactivated when a
certain forward speed is exceeded or
if reverse gear is not engaged for
approx. 10 seconds.
Activation or deactivation of the rear
view camera can be set in the vehicle personalisation menu in the Colour-
Info-Display.
Select the relevant setting in Settings,
I Vehicle in the Colour-Info-Display.
Colour-Info-Display 3 118.
Vehicle personalisation 3 122.
Fault
Fault messages are displayed with a
9 on the top line of the Info-Display.The rear view camera may not
operate properly when:
■ The surrounding is dark.
■ The sun or the beam of headlights is shining directly into the camera
lens.
■ Ice, snow, mud, or anything else covers the camera lens. Clean the
lens, rinse it with water, and wipe it with a soft cloth.
■ The tailgate is not closed correctly.
■ The vehicle is towing a trailer.
■ The vehicle had a rear end accident.
■ There are extreme temperature changes.
Rear cross traffic alert
Additional to the rear view camera
3 202 , rear cross traffic alert warns of
cross traffic from left or right side
when driving rearwards. When cross
traffic is recognized and the rear view
camera is activated, a warning
triangle with a direction arrow K
appears on the Colour-Info-Display,showing the direction of the traffic.
Furthermore, three beeps will sound
from the speaker on the respective
side.
The radar distance sensors are
located sideways in the rear bumper.
9 Warning
The rear cross traffic alert does not
replace driver vision. Note that
objects that are outside sensors,
Page 207 of 331

Driving and operating205e.g. below the bumper orunderneath the vehicle, are not
displayed.
Pedestrians, children or animals
are not detected.
Do not reverse the vehicle by only looking at the Info-Display and
check the surrounding behind and
around the vehicle before
reversing.
Activation
Rear cross traffic alert is
automatically activated together with
the rear view camera when reverse
gear is engaged.
Detection zones
The system sensors cover a zone of
approx. 20 metres to the left or right
side behind the vehicle.
Deactivation
Rear cross traffic alert is deactivated
together with the rear view camera
when a certain forward speed is
exceeded or if reverse gear is not
engaged for approx. 10 seconds.
Activation or deactivation of the rear
cross traffic alert can be set in the
vehicle personalisation menu in the
Colour-Info-Display.
Select the relevant setting in Settings,
I Vehicle in the Colour-Info-Display.
Colour-Info-Display 3 118.
Vehicle personalisation 3 122.
Fault The system may not operate properly
when:
■ Ice, snow, mud, or anything else covers the sensors.
■ The vehicle is towing a trailer.
■ The vehicle had a rear end accident.
■ There are extreme temperature changes.
Traffic sign assistant Functionality The traffic sign assistant system
detects designated traffic signs via a
front camera and displays them in the
Driver Information Centre (DIC).
Page 246 of 331
244Vehicle care
No.Circuit1Transmission control module2Engine control module3–4–5Ignition/Transmission control
module/Engine control module6Windscreen wiper7–8Fuel injection/Ignition system9Fuel injection/Ignition system10Engine control module11Lambda probe12Starter13Sensor throttle heating14Lighting15Rear window wiperNo.Circuit16Vacuum pump/Mass air flow
meter/Water in fuel sensor/DC
transformer17–18Adaptive forward lighting19Adaptive forward lighting20Fuel pump21Rear power windows22ABS23Variable effort steering24Front power windows25Power outlets26ABS27Electric parking brake28Heated rear window29Left power seat30Right power seatNo.Circuit31Air conditioning system32Body control module33Heated front seats34Sunroof35Infotainment system36–37Right high beam38Left high beam39–40–41Vacuum pump42Radiator fan43Vehicle battery/DC transformer
(only on vehicles with stop-start
system)44Headlamp washer system45Radiator fan
Page 247 of 331
Vehicle care245
No.Circuit46Terminal 87/Main relay47Lambda probe48Fog lights49Right low beam50Left low beam51Horn52Ignition53Ignition/Ventilated front seats54Ignition55Power windows/Mirror folding56Windscreen washer57–58–59Diesel fuel heating/Emission
control system60Mirror heating61Mirror heatingNo.Circuit62–63Rear window sensor64Adaptive forward lighting65Auxiliary pump (only on vehicles
with stop-start system)66Rear window washer system67Fuel system control module68–69Vehicle battery sensor70Rain sensor71Vehicle battery sensor
After changing of defective fuses,
close the fuse box cover and press
until it engages.
If the fuse box cover is not closed
correctly, malfunctions may occur.
Instrument panel fuse box
In left-hand drive vehicles, the fuse
box is behind the storage
compartment in the instrument panel.
Open compartment, compress the
locking tabs, fold compartment down and remove.
Page 253 of 331

Vehicle care251Tyre pressure monitoring
system
The tyre pressure monitoring system
checks the pressure of all four wheels once a minute when vehicle speed
exceeds a certain limit.Caution
Tyre pressure monitoring system
warns just about low tyre pressure
condition and does not replace
regular tyre maintenance by the
driver.
All wheels must be equipped with
pressure sensors and the tyres must
have the prescribed pressure.
Notice
In countries where the tyre pressure monitoring system is legally
required, the use of wheels without
pressure sensors will invalidate the
vehicle type approval.
Select the Tyre pressure monitoring
page under the Info Menu in the
Driver Information Centre (DIC)
3 111.
System status and pressure warnings
are displayed by a message with the
corresponding tyre flashing in the
DIC.
A detected low tyre pressure
condition is indicated by the control
indicator w 3 109.
If w illuminates, stop as soon as
possible and inflate the tyres as
recommended 3 293.
After inflating, some driving may be
required to update the tyre pressure
values in the DIC. During this time w
may illuminate.
If w illuminates at lower temperatures
and extinguishes after some driving,
this could be an indicator for
approaching a low tyre pressure
condition. Check tyre pressure.
Vehicle messages 3 120.
If the tyre pressure must be reduced
or increased, switch off ignition.
Only mount wheels with pressure
sensors, otherwise the tyre pressure
will not be displayed and w
illuminates continuously.
A spare wheel or temporary spare
wheel is not equipped with pressure
sensors. The tyre pressure
monitoring system is not operational
for these wheels. Control indicator w
Page 254 of 331

252Vehicle care
illuminates. For the further three
wheels the system remains
operational.
The use of commercially available
liquid tyre repair kits can impair the
function of the system. Factory-
approved repair kits can be used.
External high-power radio equipment
could disrupt the tyre pressure
monitoring system.
Each time the tyres are replaced tyre
pressure monitoring system sensors
must be dismounted and serviced.
For the screwed sensor replace valve core and sealing ring, for clipped
sensor replace complete valve stem.
Vehicle loading status Adjust tyre pressure to load condition according tyre information label or
tyre pressure chart 3 293, and select
the appropriate setting in the Tyre
loading page under the Settings
menu in the DIC 3 111.
Select:
■ Light for comfort pressure up to
3 people.
■ Eco for Eco pressure up to
3 people.
■ Max for full loading.
Auto learn function
After changing wheels the vehicle
must be stationary for approx.
20 minutes, before the system
recalculates. The following relearn
process takes up to 10 minutes of
driving with a minimum speed of
12 mph. In this case $ can be
displayed or pressure values can
swap in the DIC.
If problems occur during the relearn
process, a warning message is
displayed in the DIC.
Temperature dependency
Tyre pressure depends on the
temperature of the tyre. During
driving tyre temperature and pressure increase.
The tyre pressure value displayed in
the DIC shows the actual tyre
pressure. Therefore it is important to
check tyre pressure with cold tyres.
Tread depth
Check tread depth at regular
intervals.
Tyres should be replaced for safety
reasons at a tread depth of 2-3 mm
(4 mm for winter tyres).
For safety reasons, it is
recommended that the tread depth of
the tyres on one axle should not vary
by more than 2 mm.