Problems with PARKTRONIC
Problem
Possible causes/consequences and
M
MSolutions Only the red segments
in the PARKTRONIC
warning displays are lit.
You also hear a warning
tone for approximately
two seconds.
PARKTRONIC is then
deactivated and the
indicator lamp on the
PARKTRONIC button
lights up. PARKTRONIC has malfunctioned and has switched off.
X If problems persist, have PARKTRONIC checked at a qualified
specialist workshop. Only the red segments
in the PARKTRONIC
warning displays are lit.
PARKTRONIC is then
deactivated. The PARKTRONIC sensors are dirty or there is interference.
X Clean the PARKTRONIC sensors (Y page 349).
X Switch the ignition back on. The problem may be caused by an external source of radio or
ultrasound waves.
X See if PARKTRONIC functions in a different location. Active Parking Assist
General notes Active Parking Assist is an electronic parking
aid with ultrasound. It measures the road on
both sides of the vehicle. A parking symbol
indicates a suitable parking space. Active
steering intervention and brake application
can assist you during parking and when exit-
ing a parking space. You may also use
PARKTRONIC (Y page 212).
Important safety notes Active Parking Assist is only an aid. It is not a
substitute for your attention to the immediate
surroundings. The responsibility for safe
manoeuvring and parking remains with you.
Make sure that no persons, animals or
objects are in the manoeuvring range.
When PARKTRONIC is deactivated, Active
Parking Assist is also unavailable. G
WARNING
While parking or pulling out of a parking
space, the vehicle swings out and can drive
onto areas of the oncoming lane. This could
cause you to collide with other road users.
There is a risk of an accident.
Pay attention to other road users. Stop the
vehicle if necessary or cancel the Active Park- ing Assist parking procedure.
! If unavoidable, you should drive over
obstacles such as kerbs slowly and not at a
sharp angle. Otherwise, you may damage
the wheels or tyres.
Active Parking Assist may also display spaces not suitable for parking, e.g.:
R parking or stopping prohibitions.
R in front of driveways or entrances and exits.
R unsuitable surfaces. Driving systems
215Driving and parking Z
vehicle parallel to the direction of travel using
Active Parking Assist.
i If PARKTRONIC detects obstacles, Active
Parking Assist brakes automatically whilst
the vehicle exits the parking space. You are
responsible for braking in good time.
X Start the engine.
X Release the electric parking brake.
X Switch on the turn signal in the direction
you are pulling away.
X Shift the transmission to position Dor R.
The Start Park Assist? Yes: OK No: Start Park Assist? Yes: OK No:
message appears in the multifunction dis-
play %.
X To cancel the procedure: press the%
button on the multifunction steering wheel
or pull away.
or X To exit a parking space using Active
Parking Assist: press theabutton on
the multifunction steering wheel.
The Park Assist active Accelerate
Park Assist active Accelerate
and and brake
brake Observe
Observe surroundings
surroundings mes-
sage appears in the multifunction display.
X Release the multifunction steering wheel.
X Pull away, being ready to brake at all times.
Do not exceed a maximum speed of
approximately 10 km/h when exiting a
parking space. Otherwise, Active Parking
Assist will be cancelled.
X Shift the transmission to position Dor Ras
required or according to the message while
the vehicle is stationary.
Active Parking Assist immediately steers in
the other direction. The Park Assist
Park Assist
active Accelerate and brake active Accelerate and brake
Observe Observe surroundings
surroundings message appears
in the multifunction display.
i You will achieve the best results by wait-
ing for the steering procedure to complete before pulling away. If you reverse after activation, the steering
wheel is moved to the straight-ahead posi- tion.
X Drive forwards and reverse as prompted by
the PARKTRONIC warning displays, several
times if necessary.
Once you have exited the parking space com- pletely, the steering wheel is moved to the
straight-ahead position. You hear a tone and
the Park Assist switched off Park Assist switched off message
appears in the multifunction display. You will
then have to steer and merge into traffic on
your own. PARKTRONIC is still available. You
can take over the steering before the vehicle has exited the parking space completely. This
is useful, for example when you recognise
that it is already possible to pull out of the
parking space.
Cancelling Active Parking Assist X
Stop the movement of the multifunction
steering wheel or steer yourself.
Active Parking Assist will be cancelled at
once. The Park Assist cancelled Park Assist cancelled mes-
sage appears in the multifunction display.
or
X Press the PARKTRONIC button
(Y page 214).
PARKTRONIC is switched off and Active
Parking Assist is immediately cancelled.
The Park Assist cancelled Park Assist cancelled message
appears in the multifunction display.
Active Parking Assist is cancelled automati-
cally if:
R the electric parking brake is applied
R transmission position Pis selected
R parking using Active Parking Assist is no
longer possible
R you are driving faster than 10 km/h
R a wheel spins and ESP ®
intervenes or fails.
The ÷ warning lamp lights up in the
instrument cluster.
A warning tone sounds. The parking symbol
disappears and the multifunction display Driving systems
219Driving and parking Z
Warning display
:
Warning display
Active Blind Spot Assist is not operational at
speeds below approximately 30 km/h. Vehi-
cles in the monitoring range are then not indi-
cated.
If a vehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
30 km/h, warning lamp :on the corre-
sponding side lights up red. This warning lamp
always lights up when a vehicle enters the
blind spot monitoring range from behind or
from the side. When you overtake a vehicle,
the warning only occurs if the difference in
speed is less than 12 km/h.
If you select the reverse gear, Active Blind
Spot Assist is not operational.
The brightness of the warning lamps is auto-
matically adapted to the brightness of the
surroundings. When Active Blind Spot Assist is activated,
grey radar waves propagating rearwards
appear next to the vehicle in the assistance
display in the multifunction display. Above a
speed of 30 km/h, the colour of the radar
waves in the assistance display changes to
green ;. Active Blind Spot Assist is then
ready for use. Visual and acoustic collision warning
If you switch on the turn signals to change
lanes and a vehicle is detected in the side
monitoring range, you receive a visual and
acoustic collision warning. You will then hear
a double warning tone and red warning
lamp :flashes. If the turn signal remains on,
detected vehicles are indicated by the flash-
ing of red warning lamp :. There are no fur-
ther warning tones.
Course-correcting brake application
If Active Blind Spot Assist detects a risk of a
side impact in the monitoring range, a course- correcting brake application is carried out.
This is designed to help you avoid a collision. G
WARNING
A course-correcting brake application cannot always prevent a collision. There is a risk of an
accident.
Always steer, brake or accelerate yourself,
especially if Active Blind Spot Assist warns
you or makes a course-correcting brake appli-
cation. Always maintain a safe distance at the sides. If a course-correcting brake application
occurs, red warning lamp :flashes in the
exterior mirror and a dual warning tone
sounds. In addition, display ;underlining
the danger of a side collision appears in the
multifunction display.
In very rare cases, the system may make an
inappropriate brake application. A course-
correcting brake application may be interrup- 238
Driving systemsDriving and parking
there is sufficient distance to the side for
other traffic or obstacles. If a lane-correcting brake application occurs,
display :appears in the multifunction dis-
play. The brake application also slightly
reduces driving speed.
A lane-correcting brake application can be
made after driving over a lane marking rec-
ognised as being solid or broken. Before this,
a warning must have been issued by means of
intermittent vibration through the steering
wheel. In addition, a lane with lane markings
on both sides must be recognised.
In the case of a broken lane marking being
detected, a lane-correcting brake application can only be made if a vehicle has been detec-
ted in the adjacent lane. The following vehi-
cles can have an influence on brake applica-
tion: oncoming traffic, vehicles that are over-
taking and vehicles that are driving parallel to
your vehicle.
i A further lane-correcting brake applica-
tion can only occur after your vehicle has
returned to the original lane.
No lane-correcting brake application occurs
if:
R you clearly and actively steer, brake or
accelerate
R you cut the corner on a sharp bend
R you have switched on the turn signal
R a driving safety system intervenes, such as
ESP ®
, PRE-SAFE ®
Brake or Active Blind
Spot Assist R
you have adopted a sporty driving style with
high cornering speeds or high rates of
acceleration
R ESP ®
is deactivated
R the transmission is not in position D
R a loss of tyre pressure or a defective tyre
has been detected and displayed
R an obstacle in the lane in which you are
driving has been detected
Active Lane Keeping Assist may not detect
other road users or traffic situations. An inap- propriate brake application may be interrup-
ted at any time if:
R you steer slightly in the opposite direction
R you switch on the turn signal
R you clearly brake or accelerate
A lane-correcting brake application is inter-
rupted automatically if:
R a driving safety system intervenes, such as
ESP ®
, PRE-SAFE ®
Brake or Active Blind
Spot Assist
R lane markings are no longer detected
Activating Active Lane Keeping Assist X
Press button ;.
Indicator lamp :lights up. The Lane Lane
Keeping Assist on
Keeping Assist on message appears in
the multifunction display. If all conditions
have been satisfied, a warning or steering
intervention may be made.
If you drive at speeds above 60 km/h and
lane markings are detected, the lines in the assistance graphic display (Y page 257) Driving systems
241Driving and parking Z
G
WARNING
If you deactivate ESP ®
, ESP ®
no longer sta-
bilises the vehicle. There is an increased risk
of skidding and an accident.
Only deactivate ESP ®
in the situations descri-
bed in the following.
It may be best to deactivate ESP ®
in the fol-
lowing situations:
R when using snow chains
R in deep snow
R on sand or gravel
For further information about ESP ®
, see
(Y page 75).
X Start the engine.
X Press òon the steering wheel to open
the menu list.
X Press :or9 on the steering wheel
to select the Settings
Settings menu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Assis‐ Assis‐
tance
tance submenu.
X Press ato confirm your selection.
X Press the :or9 button to select
ESP
ESP.
X Press ato confirm.
The current selection appears.
X To activate/deactivate: pressa
again.
ESP ®
is deactivated if the åwarning lamp
in the instrument cluster lights up continu-
ously when the engine is running.
If the ÷ warning lamp lights up continu-
ously, ESP ®
is not available due to a malfunc-
tion.
Observe the information on warning lamps
(Y page 307).
Observe the information on display messages
(Y page 267). Automatic activation of Night View Assist
Plus
X Press òon the steering wheel to open
the menu list.
X Press :or9 on the steering wheel
to select the Settings
Settings menu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Assis‐
Assis‐
tance tance submenu.
X Press ato confirm your selection.
X Press the :or9 button to select
Night View Assist
Night View Assist.
X Press ato confirm.
The current selection appears.
X To activate/deactivate: pressa
again.
If Night View Assist Plus automatic activation
is switched on, the night vision image is auto- matically shown in the multifunction display if
an object is detected.
For further information about Night View
Assist Plus (Y page 234).
Activating/deactivating Traffic Sign
Assist
The Traffic Sign Assist Traffic Sign Assist function allows
you to choose whether traffic signs and mes- sages should be displayed in the lower area of
the speedometer in certain conditions.
X Press òon the steering wheel to open
the menu list.
X Press :or9 on the steering wheel
to select the Settings
Settingsmenu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Assis‐
Assis‐
tance
tance submenu.
X Press ato confirm your selection.
X Press the :or9 button to select
Traffic Sign Assist
Traffic Sign Assist. Menus and submenus
259On-board computer and displays Z
Further information on navigation can be
found on COMAND Online (see the separate
operating instructions).
Further information about Traffic Sign Assist
(Y page 230).
Setting the position
You can adjust the position of the head-up
display on the windscreen. You can compen-
sate for height differences if the seat posi-
tions are changed, for example.
X Switch on the head-up display
(Y page 247).
X Press òon the steering wheel to open
the menu list.
X Press the :or9 button on the steer-
ing wheel to select the Settings
Settings menu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Head-up Head-up
display
display submenu.
X Press ato confirm.
X Press the :or9 button to select the
Position
Position function.
X Press ato save the setting.
X Press :or9 to adjust the position
to a level from Level +5
Level +5 toLevel -5
Level -5.
X Press aor% to save the setting.
Using the Memory function, you can save and
call up the set position of the head-up display as a single memory preset (Y page 122).
Adjusting the brightness
The brightness of the head-up display is auto-
matically adjusted to the surrounding light
conditions. You can also individually adjust
the brightness of the head-up display.
X Switch on the head-up display
(Y page 247).
X Press òon the steering wheel to open
the menu list.
X Press the :or9 button on the steer-
ing wheel to select the Settings
Settings menu.
X Confirm by pressing aon the steering
wheel. X
Use : or9 to select the Head-up
Head-up
display display submenu.
X Press ato confirm.
X Press the :or9 button to select the
Brightness
Brightness function.
X Press the abutton to save the setting.
X Press :or9 to adjust the bright-
ness to a level from Level +5
Level +5 (bright) to
Level -5
Level -5 (dark).
X Press the aor% button to save the
setting.
Light submenu Switching the Intelligent Light System
on/off
X Press òon the steering wheel to open
the menu list.
X Press :or9 on the steering wheel
to select the Settings Settingsmenu.
X Confirm by pressing aon the steering
wheel.
X Use : or9 to select the Lights
Lights
submenu.
X Press ato confirm.
X Press the :or9 button to select the
Intelligent Light System
Intelligent Light System function.
If the Intelligent Light System
Intelligent Light System func-
tion has been switched on, the cone of light and the Lsymbol in the multifunction
display are shown in white.
X Press the abutton to save the setting.
If you switch on the Intelligent Light
Intelligent Light
System
System function, the following functions are
activated:
R Motorway mode
R Active light function
R Cornering light function
R Extended range foglamps
If you set the dipped-beam headlamps for
driving on the right/left, the multifunction
display shows the Inactive for left-
Inactive for left-
side traffic side traffic orInactive for right-
Inactive for right-
side traffic
side traffic display message in the262
Menus and submenusOn-board computer and displays
Lights
Lights
submenu instead of the Intelli‐
Intelli‐
gent Light System
gent Light System function (Ypage 263).
This display message will only appear if the
setting for driving on the left/right is set
opposite to your vehicle's country version.
Further information on the Intelligent Light
System (Y page 129).
Switching the spotlight function on or off
X Press òon the steering wheel to open
the menu list.
X Press :or9 on the steering wheel
to select the Settings
Settings menu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Lights Lights
submenu.
X Press ato confirm.
X Press the :or9 button to select the
Spotlight
Spotlight function.
X Press the abutton to save the setting.
When the spotlight function is activated,
the assistance graphic shows the pedes-
trian symbol.
Further information on the spotlight function
(Y page 235).
Setting the dipped-beam headlamps for
driving on the left/right
This function is only available on vehicles with
the Intelligent Light System.
You can use this function to switch between
symmetrical and asymmetrical dipped beam
(Y page 126).
X Press òon the steering wheel to open
the menu list.
X Press the :or9 button on the steer-
ing wheel to select the Settings
Settings menu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Lights Lights
submenu.
X Press ato confirm. X
Press the :or9 button to select the
Dipped beams Setting for
Dipped beams Setting for function.
You will see the selected setting, right-
right-
side traffic
side traffic orleft-side traffic
left-side traffic.
X Press the abutton to save the setting.
If you change the setting, conversion does
not take place until the next time the vehi-
cle is stationary.
If you set the dipped-beam headlamps for
driving on the right/left, then motorway
mode and the extended range foglamps are
unavailable. These are only deactivated if the
setting for driving on the left/right is set
opposite to your vehicle's country version.
A qualified specialist workshop can set the
dipped-beam headlamps for driving on the
left/right.
Instrument cluster submenu Selecting the distance unit
The
Display Display unit
unitSpeed-/odometer
Speed-/odometer func-
tion allows you to choose whether certain
displays appear in kilometres or miles in the
multifunction display.
X Press òon the steering wheel to open
the menu list.
X Press the :or9 button on the steer-
ing wheel to select the Settings Settingsmenu.
X Confirm by pressing aon the steering
wheel.
X Press :or9 to select the Instru‐
Instru‐
ment cluster
ment cluster submenu.
X Press ato confirm.
X Press the :or9 button to select the
Display unit Speed-/odometer
Display unit Speed-/odometer func-
tion.
The current setting km kmorMiles
Miles appears.
X Press the abutton to save the setting.
The selected unit of measurement for dis-
tance applies to the:
R speedometer
R digital speedometer in the Trip
Tripmenu Menus and submenus
263On-board computer and displays Z
Safety systems
Display messages
Possible causes/consequences and
M
MSolutions !÷
currently unavail‐ currently unavail‐
able See Owner's able See Owner's
Manual Manual ABS (Anti-lock Braking System), ESP
®
(Electronic Stability Pro-
gram), BAS (Brake Assist), PRE‑SAFE ®
, HOLD function, hill start
assist, Crosswind Assist, adaptive brake lights, STEER CONTROL, Active Lane Keeping Assist and Active Blind Spot Assist are tem-
porarily unavailable.
BAS PLUS with Cross-Traffic Assist, PRE‑SAFE ®
Brake, PRE‑ SAFE®
PLUS and COLLISION PREVENTION ASSIST PLUS may also have
failed.
In addition, the ÷and! warning lamps light up in the
instrument cluster.
ATTENTION ASSIST is deactivated.
For example, the on-board voltage may be insufficient.
G WARNING
The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely affec-ted. The braking distance may increase in an emergency braking
situation.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
There is an increased danger of skidding and risk of an accident.
X Drive on carefully.
Carefully drive on a suitable stretch of road, making slight steer-
ing movements at a speed above 20 km/h.
If the display message disappears, the functions mentioned
above are available again.
If the multifunction display still shows the display message:
X Drive on carefully.
X Consult a qualified specialist workshop. !÷
inoperative See inoperative See
Owner's Manual Owner's Manual ABS, ESP
®
, BAS, PRE‑SAFE ®
, HOLD function, hill start assist,
Crosswind Assist, adaptive brake lights, STEER CONTROL, Active Lane Keeping Assist and Active Blind Spot Assist are unavailable
due to a malfunction.
BAS PLUS with Cross-Traffic Assist, PRE‑SAFE ®
Brake, PRE‑ SAFE®
PLUS and COLLISION PREVENTION ASSIST PLUS may also have
failed.
In addition, the J,÷and! warning lamps may light up
in the instrument cluster. Display messages
267On-board computer and displays Z