2020 MERCEDES-BENZ METRIS display

tance from an obstacle may no longer be
shown.
Warning displays Front area warning display in center of dashboard
Rear area warning display on the dashboard
Rear area warning display in center of the head-
liner in the rear compartment.
:
Warning segments for the left side of the
vehicle
; Warning segments for the right side of the
vehicle
= Segments showing operational readiness
The warning displays show the distance
between the sensor and the obstacle. The warning display is divided into five yellow
and two red segments for each side of the
vehicle. PARKTRONIC is operational if opera-
tional readiness indicator = lights up.
There is a malfunction if only the red segments
of the warning display light up
(Y page 159).
The selected transmission position determines
whether the front and/or rear area is moni-
tored. Selector lever posi-
tion Monitoring
h
Front area
k or i Front and rear area
j
No areas activated
One or more segments light up as the vehicle
approaches an obstacle, depending on the
vehicle's distance from the obstacle. In addi-
tion, warning tones are emitted.
When the distance to the obstacle is sufficient,
you will hear an intermittent warning tone.
When the distance to the obstacle is sufficient,
you will hear an intermittent warning tone.
When the minimum distance is reached, you
hear a continuous warning tone.
Roll-back warning Regardless of transmission position,
PARKTRONIC automatically monitors the area
behind the vehicle if the vehicle begins to roll
backwards, e.g. after stopping on an uphill gra-
dient.
Activating/deactivating PARKTRONIC X
Press the f button.
If PARKTRONIC is deactivated, the indicator
lamp in the switch lights up.158
Driving systems
Driving and parking

Towing a trailer
PARKTRONIC detects a coupled trailer if your
vehicle is equipped with the corresponding
electrical installations for trailer towing.
PARKTRONIC is deactivated for the rear area
when you establish an electrical connection
between your vehicle and a trailer. If you use
an adapter for the socket, remove it from the
socket after detaching the trailer. Otherwise,
PARKTRONIC remains deactivated for the rear
area.
Problems with PARKTRONIC Problem
Possible causes/consequences and
M SolutionsOnly the red segments
in the PARKTRONIC
warning displays are lit.
In addition, a warning
tone sounds for approx.
two seconds
PARKTRONIC is then
deactivated.
The indicator lamp of
the f button lights
up and the red seg-
ments in the
PARKTRONIC warning
display go out. PARKTRONIC has malfunctioned and has switched itself off.
X
If problems persist, have PARKTRONIC checked at a qualified
specialist workshop. The PARKTRONIC warn-
ing displays implausible
distances.
For example, all the
segments may be lit
even though there is no
obstacle present. The PARKTRONIC sensors are dirty or iced up.
X Clean the PARKTRONIC sensors ( Y page 267).
X Turn the key to position 2 in the ignition lock. The license plate or other parts attached near the sensors may not
be secured correctly.
X Check the license plate and attachment parts near the sensors
for correct seating. An external radio or ultrasonic source may be causing interference.
X Check PARKTRONIC functions in a different location. Active Parking Assist
General notes Active Parking Assist is an electronic parking
aid. The system uses ultrasound sensors to
measure the road on both sides of the vehicle
and indicates suitable parking spaces. It can
then actively steer and brake the vehicle to
help you to park and exit the parking space.
Active Parking Assist includes the
PARKTRONIC parking aid which indicates visu-
ally and audibly the distance between your vehicle and an obstruction. To do this,
PARKTRONIC uses the ultrasonic sensors of
the Active Parking Assist

(Y page 156).
Important safety notes Active Parking Assist is only an aid. It is not a
substitute for your attention to the immediate
surroundings. You are responsible for safe
maneuvering, parking and pulling away. Make
sure that no persons, animals or objects are in
the maneuvering range. Driving systems
159
Driving and parking Z

When you deactivate PARKTRONIC, Active
Parking Assist will also be deactivated.
For vehicles with a trailer coupling installed,
the minimum length for parking spaces will be
slightly increased.
If you have attached a trailer to your vehicle,
you should not use Active Parking Assist. Once
the electrical connection is established
between your vehicle and the trailer, Active
Parking Assist is no longer available.
PARKTRONIC is then deactivated for the rear
area.
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
result in a collision with another road user.
There is a risk of an accident.
Pay attention to other road users. Stop the
vehicle if necessary or cancel the Active
Parking Assist parking procedure.
! If they cannot be avoided, drive over
obstacles such as curbs slowly and at an
obtuse angle. Otherwise, you may damage
the wheels or tires.
Active Parking Assist may also display spaces
not suitable for parking, e.g.:
R in a zone where parking or stopping is pro-
hibited
R in front of driveways or entrances and exits
R on unsuitable surfaces
Parking tips:
R on narrow roads, drive as closely as possible
past the parking space.
R parking spaces that are littered or over-
grown might be identified or measured
incorrectly.
R parking spaces that are partially occupied
by trailer drawbars might not be identified
as such or be measured incorrectly.
R snowfall or heavy rain may lead to a parking
space being measured inaccurately.
R when transporting a load which protrudes
from your vehicle, you should not use Active
Parking Assist.
R never use Active Parking Assist when snow
chains are installed. R
always ensure that the tire pressure is cor-
rect This has a direct influence on the park-
ing characteristics of the vehicle.
R if you mount wheels with a different wheel
size, this will have a direct influence on the
parking result.
R if you mount tires from another manufac-
turer, this may have an influence on the
parking result.
R if you drive slowly past the parking space, a
better parking result is achieved.
R pay attention to the PARKTRONIC warning
messages ( Y page
158) during the parking
procedure.
R you can intervene in the steering procedure
to correct it at any time. Parking assistance
will then be canceled and Active Parking
Assist stopped.
Use Active Parking Assist for parking spaces
that are:
R parallel or at right angles to the direction of
travel.
R on straight roads, not bends.
R on the same level as the road, e.g. not on
the pavement.
Detecting parking spaces G
WARNING
If there are objects above the detection
range:
R Active Parking Assist may steer too early
R the vehicle may not stop in front of these
objects
This could cause a collision. There is a risk
of an accident.
If objects are located above the detection
range, stop and deactivate Active Parking
Assist.
Objects located above the detection range of
Active Parking Assist will not be detected
when the parking space is measured. These
are not taken into account when the parking
procedure is calculated, e.g. overhanging
loads, overhangs or truck loading ramps.
Further information about the detection range
(Y page

157).160
Driving systems
Driving and parking

Active Parking Assist does not assist you park-
ing in spaces at right angles to the direction of
travel if:
R two parking spaces are located directly next
to one another
R the parking space is directly next to a low
obstacle such as a low curb
R you forward park
Active Parking Assist does not assist you park-
ing in spaces that are parallel or at right angles
to the direction of travel if:
R the parking space is on a curb
R the system reads the parking space as being
blocked, for example by foliage or grass
paving blocks
R the area is too small for the vehicle to
maneuver into
R the parking space is bordered by an obsta-
cle, e.g. a tree, a post or a trailer :
Detected parking space on the left
; Parking symbol
= Detected parking space on the right
If the driver's seat belt is fastened and all
doors are closed, Active Parking Assist is acti-
vated automatically when driving forwards.
The system is operational at speeds of up to
approximately
22 mph (35 km/h). While in
operation, the system independently locates
and measures parking spaces on both sides of
the vehicle.
Active Parking Assist will only detect parking
spaces:
R parallel or at right angles to the direction of
travel
R that are parallel to the direction of travel
and are at least 59 in (1.5 m) wide
R that are parallel to the direction of travel
and at least 40 in (1.0 m) longer than your
vehicle
R that are at right angles to the direction of
travel and at least 40 in (1.0 m) wider than
your vehicle i
Note that Active Parking Assist cannot
measure the length of a parking space if it is
at right angles to the direction of travel. You
will need to judge whether your vehicle will
fit in the parking space.
When the vehicle is driving at speeds of up to
approximately

20 mph (30 km/h), parking
symbol ; is shown as a status display in the
header.
The system detects and differentiates between
parking spaces which are parallel or at right
angles to the direction of travel. When a park-
ing space is detected, an arrow appears next
to parking symbol ; to indicate which side
the parking space is on. The parking space is
displayed while you are driving past it and until
you are approximately 50 ft (15 m) away from
it.
Active Parking Assist displays parking spaces
on the passenger side as standard. The park-
ing spaces on the driver's side are only dis-
played if you operate the turn signal on the
driver's side. When parking on the driver's
side, you must operate the turn signal until
you have started active parking assistance by
pressing the a button on the steering
wheel.
Parking G
WARNING
If you leave the driver's seat when the vehi-
cle is only being braked by Active Parking
Assist, the vehicle could roll away if:
R there is a malfunction in the system or in
the voltage supply.
R the electrical system in the engine com-
partment, the battery or the fuses are
tampered with.
R the battery is disconnected.
R the vehicle is accelerated, e.g. by a vehi-
cle occupant.
There is a risk of an accident.
Before leaving the driver's seat, always
secure the vehicle against rolling away.
If PARKTRONIC detects obstacles, Active Park-
ing Assist brakes automatically during the
parking process. You are responsible for brak-
ing in good time. Driving systems
161
Driving and parking Z

X
Bring the vehicle safely to a stop when the
parking symbol shows the desired parking
space in the instrument cluster.
X Shift the transmission to position k.
The display shows the Start Park
Assist? Yes: OK No: % message and
the location of the parking space.
X To cancel the process: press the % but-
ton on the steering wheel or drive off.
or X To park using active parking assistance:
press the a button on the steering
wheel.
The display shows the
Park Assist
Active: Accelerate and Brake Obs.
Surroundings message.
X Let go of the steering wheel.
X Reverse the vehicle, being ready to brake at
all times. Exit the parking space slowly and
do not drive faster than
6 mph (10 km/h).
Otherwise parking assistance is canceled
and Active Parking Assist is stopped.
Active Parking Assist brakes the vehicle to a
standstill when the vehicle approaches the
rear border of the parking space.
Maneuvering may be required in tight parking
spaces. The display shows the Park Assist
Active: Select D Obs. Surroundings
message.
X While the vehicle is stationary, shift the
transmission to position h.
Active Parking Assist immediately steers in
the other direction. The display shows the
Park Assist Active: Accelerate and
Brake Obs. Surroundings message.
i You will achieve the best results by waiting
for the steering procedure to complete
before pulling away.
X Drive forwards and be ready to brake at all
times.
Active Parking Assist brakes the vehicle to a
standstill.
The display shows the Park Assist
Active: Select R Obs. Surroundings
message.
As soon as the parking procedure is complete,
the Park Assist Finished message appears
in the display and a tone sounds. The parking
assistance function of Active Parking Assist is
stopped. The vehicle is parked and kept sta-
tionary without the driver having to depress the brake pedal. The braking effect is canceled
when you depress the accelerator pedal.
Active Parking Assist no longer supports you
with steering interventions and brake applica-
tions. Once active parking assistance has been
stopped, you must steer and brake again your-
self. PARKTRONIC is still available.
Parking tips:
R The way your vehicle is positioned in the
parking space after parking is dependent on
various factors. These include the position
and shape of the vehicles parked in front
and behind it and the conditions of the loca-
tion. It may be the case that Active Parking
Assist guides you too far into a parking
space, or not far enough into it. In some
cases, it may also lead you across or onto
the curb. In this case, cancel the active
parking assistance.
R You can also engage transmission position
h prematurely. The vehicle redirects and
does not drive as far into the parking space.
If you change direction too early, parking
assistance is canceled and Active Parking
Assist is stopped. It is then not possible to
achieve a sensible parking position from the
current position.
Exiting a parking space In order that Active Parking Assist can assist
you when exiting the parking space, the follow-
ing conditions must be fulfilled:
R the border of the parking space must be
high enough at the front and the rear, a
curb, for instance, is not sufficient.
R the border of the parking space must not be
too wide. Your vehicle can be maneuvered
into a position at a maximum of 45° to the
starting position in the parking space.
R a maneuvering distance of at least

3.3 ft
(1.0 m) must be available.
Active Parking Assist can only assist you with
exiting a parking space if you have parked the
vehicle parallel to the direction of travel using
Active Parking Assist.
If PARKTRONIC detects obstacles, Active Park-
ing Assist brakes automatically when exiting
from the parking space. You are responsible
for braking in good time. 162
Driving systems
Driving and parking

X
Start the engine.
X Switch on the turn signal in the direction in
which you are pulling away.
X Shift the transmission to position h or k.
The display shows the message Start
Park Assist? Yes: OK No: %.
X To cancel the process: press the % but-
ton on the steering wheel or drive off.
or
X To exit the parking space using active
parking assistance: press the a button
on the steering wheel.
The display shows the message Park
Assist Active: Accelerate and Brake
Obs. Surroundings.
X Let go of the steering wheel.
X Pull away, being ready to brake at all times.
Exit the parking space slowly and do not
drive faster than
6 mph (10 km/h). Other-
wise parking assistance is canceled and
Active Parking Assist is stopped.
Active Parking Assist brakes the vehicle to a
standstill when the vehicle approaches a
border of the parking space.
X While the vehicle is stationary, shift the
transmission to position h or k as
required or according to the message.
Active Parking Assist immediately steers in
the other direction. The display shows the
message Park Assist Active: Acceler‐
ate and Brake Obs. Surroundings.
i You will achieve the best results by waiting
for the steering procedure to complete
before pulling away.
If you back up 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:
R The display shows the Park Assist Fin‐
ished message.
R A tone sounds.
R The steering wheel is moved to the straight-
ahead position
The parking assistance function of Active Park-
ing Assist is stopped. 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 vehi-
cle has exited the parking space completely.
This is useful, for example when you recognize
that it is already possible to pull out of the
parking space.
Canceling active parking assistance X
Stop the movement of the steering wheel or
steer yourself.
or X Press the f button and deactivate
PARKTRONIC
(Y page 158).
Parking assistance is canceled immediately
and Active Parking Assist is stopped. The
display shows the Park Assist Canceled
message.
Active parking assistance is canceled automat-
ically in the following cases:
R you apply the parking brake.
R parking using Active Parking Assist is no
longer possible.
R you are driving faster than

6 mph
(10 km/h).
R a wheel spins and ESP ®
intervenes or fails.
The ÷ warning lamp in the instrument
cluster then lights up.
R you unfasten your seat belt.
R you open a door or the tailgate/rear-end
door.
R you shift the transmission to position j.
A warning tone sounds, the parking symbol in
the display goes out and the Park Assist
Canceled message appears.
Once active Parking Assist has been canceled,
you must steer and brake again yourself.
If a system malfunction occurs, vehicles are
automatically braked down to a standstill. To
continue driving, you must depress the accel-
erator pedal again. Rear view camera
General notes On vehicles with a tailgate, the rear view cam-
era is next to the tailgate handle
(
Y page

267).
On vehicles with rear-end doors, the rear view
camera is in the top of the license plate mold-
ing ( Y page 267). Driving systems
163
Driving and parking Z

The rear view camera is a visual parking aid. It
shows you the area behind the vehicle in the
audio display.
The area behind the vehicle is displayed in a
mirrored fashion, as in the rear-view mirror or
the exterior mirrors. The guide lines displayed
assist you in backing up.
The message displays depend on the language
setting of the audio system. The following rear
view camera displays are examples.
Important safety notes !
Objects that are not at ground level appear
further away than they actually are, for
example:
R the bumper of the vehicle parked behind
R the drawbar of a trailer
R the ball coupling of a trailer tow hitch
R the tail-end of a truck
R slanted posts
Only use the camera guide lines for orienta-
tion. Do not get any closer to objects than
the lowest horizontal guide line. You may
otherwise damage your vehicle and/or the
object.
The rear view camera is only an aid. It cannot
replace your own awareness of the immediate
surroundings. You are responsible for safe
maneuvering and parking. Make sure that
there are no persons, animals or objects in the
maneuvering area while maneuvering and
parking in parking spaces.
The rear view camera may show obstacles in
perspectival distortion, incorrectly or not at all.
The rear view camera cannot display all
objects located very near and/or under the
rear bumper. It does not warn you of a colli-
sion, persons or objects.
Under the following circumstances, the rear
view camera will not function, or will function
in a limited manner:
R if the tailgate or rear-end door is open.
R if it is raining very heavily or snowing, or it is
foggy.
R at night or in very dark places.
R if the camera is exposed to very bright light.
White lines may appear in the camera image
R if the area is lit by fluorescent light, e.g.
from fluorescent lamps or LED lighting.
The camera image may flicker. R
if the camera lens fogs up, e.g. when driving
into a heated garage in winter, causing a
rapid change in temperature.
R the camera lens is dirty or obstructed.
Observe the notes on cleaning.
(Y page
267)
R if the rear of the vehicle is damaged.
In this case, have the camera position and
setting checked at a qualified specialist
workshop.
R the display has pixel errors.
Have the display repaired or replaced if usa-
bility is significantly reduced due to pixel
errors.
Do not use the rear view camera in these sit-
uations. You could otherwise injure others or
damage objects and the vehicle while parking
and maneuvering.
The field of vision and other functions of the
rear view camera may be restricted due to
additional accessories on the rear of the vehi-
cle (e.g. license plate holder, rear-mounted
bicycle rack).
Guide lines are always shown at road level. In
trailer mode, the guide lines are shown at the
level of the trailer coupling.
If you change wheel size, make sure they cor-
respond to the correct wheel size category
( Y page 278). If the category is changed with-
out recoding the control units in the vehicle,
the rear view camera cannot be precisely cali-
brated. The guide lines at road level or at the
level of the trailer tow hitch will not be dis-
played correctly.
In vehicles with a tailgate, the rear view cam-
era is protected from raindrops and dust by
means of a flap. When the rear view camera is
activated, this flap opens.
The flap closes again when:
R you have finished the maneuvering process
R you switch off the engine
For technical reasons, the flap may remain
open briefly after the rear view camera has
been deactivated. 164
Driving systems
Driving and parking

Switching the rear view camera on or
off
X
To activate: make sure that the key is in
position 2 in the ignition lock.
X Shift the transmission to position k.
On vehicles with a tailgate, the rear view
camera flap opens. The audio display shows
the area behind the vehicle. The rear area
shown is divided by guide lines.
In vehicles with a trailer coupling installed, the
function mode of the rear view camera can be
switched over when the trailer is reached. The
rear view camera then changes the viewing
angle and shows a locating aid for the ball cou-
pling of the trailer tow hitch to help reach the
drawbar.
X To switch function mode: select and con-
firm "Reverse parking" function : or "Cou-
pling up a trailer“ function ; using the
audio system control knob.
Information on the audio system control
knob can be found in the separate operating
instructions.
The symbol of the selected function is high-
lighted.
X To switch off: shift the transmission to
position i or h.
The dynamic guide lines are hidden and
after about 15 seconds the rear view cam-
era switches itself off.
or X Drive forwards more than about 30 ft
(10 m).
or X Drive forwards faster than 6 mph
(10 km/h
).
or X Shift the automatic transmission to position
j. In vehicles with Active Parking Assist, the rear
view camera remains switched on after the ini-
tial shift to reverse gear for the whole duration
of active parking assistance. You can find
information on active parking assistance under
"Active Parking Assist“

(Y page 159).
Messages in the multimedia system
display :
Yellow guide line at a distance of approx-
imately
13 ft (4.0 m) from the rear of the
vehicle
; White guide line without turning the steer-
ing wheel, vehicle width including the exte-
rior mirrors (static)
= Yellow guide line for the vehicle width
including the exterior mirrors, at the cur-
rent steering angle (dynamic)
? Yellow lane marking the course the tires
will take at the current steering angle
(dynamic) A
Yellow guide line at a distance of approx-
imately

3 ft (1.0 m) from the rear of the
vehicle
B Red guide line at a distance of approx-
imately

12 in (0.30 m) from the rear of the
vehicle
C Bumper
D Vehicle center axis (locating aid) Driving systems
165
Driving and parking Z