2020 MERCEDES-BENZ METRIS parking sensors

Trailer towing ................................. 153
Warning display
............................. 153
Blower
see Climate control
Bluetooth ®
Audio ............................... 187
Brake
Display message (vehicle without
steering wheel buttons) ................. 196
Downhill slopes .............................. 142
Heavy and light loads ..................... 142
New brake discs ............................ 143
Wet road surfaces .......................... 142
Brake Assist
see BAS (Brake Assist System)
Brake assistance
see BAS (Brake Assist System)
Brake fluid
Checking the level ......................... 255
Display message (vehicle with
steering wheel buttons) ................. 213
Display message (vehicle without
steering wheel buttons) ................. 199
Notes ............................................. 310
Brake force distribution
see EBD (electronic brake force
distribution)
Brake lamps
Display messages (vehicle with
steering wheel buttons) ................. 217
Display messages (vehicle with-
out steering wheel buttons) ........... 202
Replacing bulbs ............................. 108
Trailer display messages (vehicle
with steering wheel buttons) ......... 216
Trailer display messages (vehicle
without steering wheel buttons) .... 202
Brake pads/linings
New ............................................... 143
Brakes
ABS .................................................. 67
Adaptive Brake Assist .................... 150
Applying the parking brake ............ 138
BAS .................................................. 67
Brake fluid (notes) ......................... 310
Checking brake fluid level .............. 255
Display message (vehicle with
steering wheel buttons) ................. 210
EBD .................................................. 68 Hill start assist ............................... 129
Important safety notes
.................. 142
New brake pads/linings ................ 143
Parking brake (notes) ..................... 143
Riding tips ...................................... 142
Warning lamp ................................. 229
Breakdown
Mercedes-Benz Service24h ........... 272
Vehicle tool kit ............................... 270
Breakdown assistance
see Towing away
Buttons
On the instrument cluster .............. 176
On the steering wheel .................... 181 C
California Important notice for retail cus-
tomers and lessees ..........................

27
Camera
see Rear view camera
Car wash
see Care
Care
Car wash ........................................ 264
Carpets .......................................... 269
Display ........................................... 268
Exterior lights ................................ 266
Interior ........................................... 268
Notes ............................................. 263
Paint .............................................. 265
Plastic trim .................................... 268
Power washer ................................ 265
Rear view camera .......................... 267
Roof lining ...................................... 269
Seat belt ........................................ 269
Seat cover ..................................... 269
Sensors ......................................... 267
Sliding door ................................... 267
Steering wheel ............................... 269
Trim pieces .................................... 269
Washing by hand ........................... 264
Washing the engine ....................... 265
Wheels ........................................... 266
Windows ........................................ 265
Wiper blades .................................. 266 6
Index

Operating safety and vehicle
approval
Attachments and bodies
.................. 33
Changing the engine power out-
put ................................................... 32
Correct use ...................................... 29
Declaration of conformity ................ 31
Equipment and conversions ............. 33
Important safety notes .................... 30
Information about body/equip-
ment mounting directives ................ 33
Notes on operating the vehicle ........ 30
Qualified specialist workshop .......... 32
Registering your vehicle ................... 33
Operating system
On-board computer (vehicle with
steering wheel buttons) ................. 181
On-board computer (vehicle with-
out steering wheel buttons) ........... 176
Operating unit
Media Interface ................................ 43
Operator's Manual
General notes .................................. 27
Vehicle equipment ........................... 27
Outside temperature display ........... 175
Overhead control panel ...................... 44
Overrevving range ............................. 175
Overrun cutoff ................................... 140P
Paint code number ............................
304
Paintwork (cleaning instructions) ... 265
Parking ............................................... 138 Important safety notes .................. 138
Parking brake ................................ 138
Rear view camera .......................... 163
see Active Parking Assist
see PARKTRONIC
Parking aid
Active Parking Assist ..................... 159
see PARKTRONIC
see Rear view camera
Parking aid
see PARKTRONIC
Parking brake
Display message (vehicle with
steering wheel buttons) ................. 214 Display message (vehicle without
steering wheel buttons) .................

201
Notes/function .............................. 138
Warning lamp ................................. 138
Parking brake
see Parking brake
Parking lamps
Changing bulbs .............................. 107
PARKTRONIC
Deactivating/activating ................. 158
Display messages .......................... 221
Driving system ............................... 156
Function/notes ............................. 156
Important safety notes .................. 157
Problem (malfunction) ................... 159
Range of the sensors ..................... 157
Roll-back warning .......................... 158
Trailer towing ................................. 159
Warning display ............................. 158
Partition
Note ................................................. 34
Transport protection ...................... 244
PASSENGER AIR BAG OFF
Indicator lamp .................................. 47
Passenger bench seat
Seat sliders ...................................... 89
Passenger compartment air-con-
ditioning system
see Climate control
Passenger compartment heating
see Climate control
Pedestrian protection
see Hood
Pets in the vehicle ............................... 66
Plastic trim (cleaning instruc-
tions) .................................................. 268
Power washers .................................. 265
Power windows
see Side windows
Preparing for a journey
Checks in the vehicle ..................... 127
Visual check of the vehicle exte-
rior ................................................. 127
Program selector button .................. 134
Protection of the environment
General notes .................................. 29
Pulling away
Automatic transmission ................. 128 Index
17

Useful information
This Operator's Manual describes all models
as well as standard and optional equipment of
your vehicle that were available at the time of
going to print. Country-specific variations are
possible. Note that your vehicle may not be
equipped with all of the described functions.
This also applies to systems and functions rel-
evant to safety.
Read the information on qualified specialist
workshops (Y page
32).Breaking-in notes
Important safety notes
In certain driving and driving safety systems,
the sensors adjust automatically while a cer-
tain distance is being driven after the vehicle
has been delivered or after repairs. Full system
effectiveness is not reached until the end of
this teach-in procedure.
New or replaced brake pads and brake discs
only reach their optimal braking effect after a
few hundred kilometers of driving. Until then,
compensate for this by applying greater force
to the brake pedal. The first 1000 miles (1500 km)
For the service life and economy of your vehi-
cle it is crucial that you break in the engine
with due care.
R Therefore, protect the engine for the first
1000 miles (1500 km

) by driving at varying
vehicle and engine speeds.
R Avoid overstraining the vehicle and high
engine speeds during this period, e.g. driv-
ing at full throttle. Do not exceed Ø of the
permissible maximum speed for each gear.
R Do not change down a gear manually in
order to brake.
R Try to avoid depressing the accelerator
pedal beyond the pressure point (kickdown).
After 1000 miles (1500 km), you can increase
the engine speed gradually and accelerate the
vehicle to full speed.
i You should also observe these notes on
breaking-in if the engine or parts of the drive
train on your vehicle have been replaced. Driving
Important safety notes
G
WARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system
or parts of the engine that heat up. There is
a risk of fire.
Carry out regular checks to make sure that
there are no flammable foreign materials in
the engine compartment or in the exhaust
system. G
WARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could
affect, for example, the power steering and
the brake boosting effect. You will require
considerably more effort to steer and brake.
There is a risk of an accident.
Do not switch off the ignition while driving. G
WARNING
If the parking brake has not been fully
released when driving, the parking brake
can:
R overheat and cause a fire
R lose its hold function.
There is a risk of fire and an accident.
Release the parking brake fully before driv-
ing off.
! Warm up the engine quickly. Do not use
the engine's full performance until it has
reached operating temperature.
Only shift the automatic transmission to the
desired drive position when the vehicle is
stationary.
Where possible, avoid spinning the drive
wheels when pulling away on slippery roads.
You could otherwise damage the drive train. 126
Driving
Driving and parking

R
you shift to neutral i while the vehicle is in
motion
R ESP ®
intervenes or you deactivate ESP ®
R there is a malfunction in the ESP ®
or ABS
system
If cruise control automatically deactivates, a
warning tone sounds and the Cruise Con‐
trol Off message appears briefly in the dis-
play.
The V symbol and the display of the stored
speed in the header or in the status area of
the display are then not shown.
Problems with cruise control The speed cannot be set when cruise control
is activated.
The display is showing a message of high pri-
ority and cannot therefore show a change in
speed.
X Proceed as instructed by the message in the
display. COLLISION PREVENTION ASSIST
General notes COLLISION PREVENTION ASSIST helps you:
R to minimize the risk of a front-end collision
with a detected obstacle in the path of your
vehicle
R to reduce the consequences of a collision
with the vehicle in front
The system uses radar sensors to detect vehi-
cles in front.
COLLISION PREVENTION ASSIST consists of
the distance warning function and Adaptive
Brake Assist.
If COLLISION PREVENTION ASSIST is malfunc-
tioning, the display shows a corresponding
message
(Y page 222). Distance warning function Important safety notes
G
WARNING
The distance warning function does not
react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
The distance warning function may not give
warnings in all critical situations. There is a
risk of an accident.
Always pay careful attention to the traffic
situation and be ready to brake.
Always adapt your speed to suit the prevail-
ing road and traffic conditions. G
WARNING
The distance warning function cannot
always clearly identify objects and complex
traffic situations.
In such cases, the distance warning function
may:
R give an unnecessary warning
R not give a warning
There is a risk of an accident.
Always pay careful attention to the traffic
situation and do not rely solely on the dis-
tance warning function.
In particular, the detection of obstacles can be
impaired in the case of: R dirt on the sensors or anything else covering
the sensors
R snow or heavy rain
R interference from other radar sources
R strong radar reflections, for example, in
parking garages
R a narrow vehicle traveling in front, e.g. a
motorbike
R a vehicle traveling in front on a different line
Due to the nature of the system, particularly
complicated but non-critical driving conditions Driving systems
149
Driving and parking Z

Always pay careful attention to the traffic
situation and be ready to brake. G
WARNING
Adaptive Brake Assist cannot always clearly
identify objects and complex traffic situa-
tions.
In such cases, Adaptive Brake Assist can:
R intervene unnecessarily
R not intervene
There is a risk of an accident.
Always pay careful attention to the traffic
situation and be ready to brake. Terminate
the intervention in a non-critical driving sit-
uation.
In particular, the detection of obstacles can be
impaired in the case of:
R dirt on the sensors or anything else covering
the sensors
R snow or heavy rain
R interference from other radar sources
R strong radar reflections, for example, in
parking garages
R a narrow vehicle traveling in front, e.g. a
motorbike
R a vehicle traveling in front on a different line
Due to the nature of the system, particularly
complicated but non-critical driving conditions
may also cause Adaptive Brake Assist to inter-
vene.
If you fail to adapt your driving style, Adaptive
Brake Assist can neither reduce the risk of
accident nor override the laws of physics.
Adaptive Brake Assist cannot take into
account road, weather or traffic conditions.
Adaptive Brake Assist is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, braking in good time
and for staying in your lane.
Following damage to the front end of the vehi-
cle, have the configuration and operation of
the radar sensor checked at a qualified spe-
cialist workshop. This also applies to collisions
at slow speeds where there is no visible dam-
age to the front of the vehicle.
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 functioning of Adaptive Brake Assist may
be impaired. COLLISION PREVENTION ASSIST
may then detect a malfunction and switch
itself off.
If Adaptive Brake Assist is not available due to
a malfunction in the radar sensor system, the
brake system remains available with full brake
boosting effect and BAS.
Operation With the help of the radar sensor system,
Adaptive Brake Assist can detect obstacles
that have been in the path of your vehicle for
an extended period of time. Adaptive Brake
Assist does not react to stationary obstacles.
If Adaptive Brake Assist detects a risk of colli-
sion with a vehicle traveling in front or with a
stationary obstacle, the system calculates the
braking force necessary to avoid this collision.
If you apply the brakes forcefully, Adaptive
Brake Assist will automatically increase the
braking force to a level suitable for the traffic
conditions.
X Brake until the distance to the obstacle
increases and the risk of a collision passes.
ABS prevents the wheels from locking.
The brakes function as usual again if:
R you release the brake pedal
R there is no longer any danger of a collision
R no obstacle is detected in front of your vehi-
cle
Braking assistance is then ended. Blind Spot Assist
General notes Blind Spot Assist monitors the areas on either
side of the vehicle that are not visible to the
driver with two lateral, rear-facing radar sen-
sors in the bumper. It supports you from
speeds of approximately

20 mph (30 km/h). A
warning display in the exterior mirrors draws
your attention to vehicles detected in the
monitored area. If you then switch on the cor-
responding turn signal to change lane, you will
also receive an optical and audible collision
warning. Driving systems
151
Driving and parking Z

Important safety notes
G
WARNING
Blind Spot Assist does not react to:
R vehicles overtaken too closely on the side,
placing them in the blind spot area
R vehicles which approach with a large
speed differential and overtake your vehi-
cle
As a result, Blind Spot Assist may not give
warnings in such situations. There is a risk
of an accident.
Always observe the traffic conditions care-
fully, and maintain a safe lateral distance.
Blind Spot Assist is only an aid. It may fail to
detect some vehicles and is no substitute for
attentive driving. Always ensure that there is
sufficient distance to the side for other road
users and obstacles.
In particular, the detection of obstacles can be
impaired in the case of:
R dirt on the sensors or anything else covering
the sensors
R fog, heavy rain or snow
R narrow vehicles, e.g. motorcycles or bicy-
cles
R very wide lanes
R narrow lanes
R vehicles not driving in the middle of their
lane
R barriers or other road boundaries
Vehicles in the monitoring range are then not
indicated.
i USA only:
This device has been approved by the FCC
as a "Vehicular Radar System". The radar
sensor is intended for use in an automotive
radar system only. Removal, tampering, or
altering of the device will void any warran-
ties, and is not permitted by the FCC. Do
not tamper with, alter, or use in any non-
approved way.
Any unauthorized modification to this device
could void the user’s authority to operate
the equipment. Monitoring range of the sensors
Blind Spot Assist monitors the area shown in
the diagram up to
118 in (3 m) behind and
directly next to your vehicle.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may be
the case if the vehicles are driving on the inner
side of their lane.
Due to the nature of the system:
R warnings may be issued in error when driv-
ing close to crash barriers or similar solid
lane borders.
R warnings may be interrupted when driving
alongside long vehicles, e.g. trucks, for a
prolonged time.
The two sensors for Blind Spot Assist are inte-
grated into the sides of the rear bumper. Make
sure that the bumper is free of dirt, ice or
slush in the vicinity of the sensors. The radar
sensors must not be covered, for example by
rear-mounted cycle racks or overhanging
loads. Following a severe impact or in the
event of damage to the bumper, have the func-
tion of the radar sensors checked at a quali-
fied specialist workshop. Blind Spot Assist
may otherwise not work properly. 152
Driving systems
Driving and parking

For vehicles with steering wheel buttons you
can have the current ATTENTION ASSIST
(Attention Level) assessment displayed.
X Select Status Overview in the Assist.
menu and display the attention level
(Y page
189).
The following information is displayed: R the length of the journey since the last
break.
R the attention level determined by ATTEN-
TION ASSIST, displayed in a bar display in
five levels from low to high.
R if ATTENTION ASSIST is unable to calculate
the attention level and cannot output a
warning, the System Passive message
appears in the display. The bar display is
then dimmed. This is the case, for example,
if you are predominantly driving at a speed
below

40 mph (60 km/h) or above 125 mph
(200 km/h).
Activating ATTENTION ASSIST X
Activating ATTENTION ASSIST with the on-
board computer:
R on vehicles without steering wheel but-
tons

(Y page 180)
R on vehicles with steering wheel buttons
(Y page 190)
For vehicles with steering wheel buttons,
the system determines the attention level of
the driver depending on the setting selec-
ted:
Standard: the sensitivity with which the
system determines the attention level is set
to normal.
Sensitive: the sensitivity is set higher. The
driver is warned earlier.
When ATTENTION ASSIST is switched on and
the vehicle engine is running: R on vehicles without steering wheel buttons,
the À indicator lamp in the instrument
cluster lights up
R on vehicles with steering-wheel buttons, the
display shows the À symbol:
- in the status area
- in the Status Overview of the Assist.
menu (Y page

189)
For vehicles with steering wheel buttons, if you
deactivate ATTENTION ASSIST, the system is
automatically re-activated when you start the engine. The system sensitivity then corre-
sponds to the last selection activated – stand-
ard or sensitive.
If you switch off ATTENTION ASSIST in a vehi-
cle without steering wheel buttons, the system
remains switched off even after you start the
engine. The status of the system after switch-
ing on the engine always corresponds to the
status last selected.
Warning in the display If the system detects tiredness or increasing
lapses in concentration, the warning
Atten‐
tion Assist: Take a Break! or Attent.
Asst: Take Break!is shown in the display.
An additional warning tone sounds.
X If necessary, take a break.
X Confirm the message by pressing the a
button on the steering wheel.
On long journeys, take regular breaks in good
time to allow yourself to rest. If you do not
take a break and ATTENTION ASSIST contin-
ues to detect increasing lapses in concentra-
tion, you will be warned again after

15 minutes
at the earliest. This will only happen if ATTEN-
TION ASSIST still detects typical indicators of
fatigue or increasing lapses in concentration. PARKTRONIC
General notes PARKTRONIC is an electronic parking aid. The
system is equipped with ultrasonic sensors in
the front and rear bumpers to monitor the area
around your vehicle. PARKTRONIC indicates
visually and audibly the distance between your
vehicle and an object.
Your vehicle features two separate sound
emitters with different frequencies for the
warning tones. The warning ranges in front of
and behind the vehicle are indicated by differ-
ent warning tones.
PARKTRONIC is activated automatically when
you:
R turn the key to position 2 in the ignition lock
R release the parking brake and
R move the selector lever to position D, N or R156
Driving systems
Driving and parking

PARKTRONIC is deactivated at speeds above
11 mph (18 km/h
). PARKTRONIC is reactiva-
ted at speeds below 10 mph (16 km/h).
Important safety notes PARKTRONIC is only an aid. It cannot replace
your own awareness of the immediate sur-
roundings. You are responsible for safe
maneuvering, parking and pulling away. Make
sure that there are no persons, animals or
objects in the maneuvering area while maneu-
vering and parking in/leaving parking spaces.
! Pay particular attention to obstacles above
or below the sensors when parking, such as
flower pots or trailer towbars. PARKTRONIC
does not recognize such objects when they
are in the immediate vicinity of the vehicle.
You could damage the vehicle or objects.
PARKTRONIC can suffer interference from:
R ultrasonic sources such as a truck's
compressed-air brakes, an automatic car
wash or a pneumatic drill
R attachments to the vehicle, e.g. rear
mounted racks
R number plates (vehicle license plates)
that are not affixed flat against the
bumper
R dirty or icy sensors
Remove a detachable trailer coupling if it is no
longer required. PARKTRONIC measures the
minimum detection range to an obstacle from
the bumper, not the ball coupling.
Range of the sensors PARKTRONIC does not account for obstacles
that are:
R beneath its detection range, e.g. persons,
animals or objects
R above its detection range, e.g. overhanging
loads, overhangs or loading ramps of trucks The sensors must be free of dirt, ice or slush.
Otherwise, they cannot function correctly.
Clean the sensors regularly, taking care not to
scratch or damage them (Y page

267).
Front sensors Center Approx. 39 in
(100 cm

) Corners Approx. 24 in
(60 cm

) Rear sensors
Center Approx. 47 in
(120 cm

) Corners Approx. 31 in
(80 cm

) Minimum distance
Center Approx. 8 in (20 cm)
Corners Approx. 8 in (20 cm)
If an obstacle is within this range, the corre-
sponding segments of the warning displays
light up and you hear a warning tone. If the
distance falls below the minimum, the dis- Driving systems
157
Driving and parking Z