2020 MERCEDES-BENZ METRIS warning light

Observe the following when towing a trailer:
R Practice driving around bends, stopping and
backing up at a place where there is no traf-
fic. This enables you to gain experience and
get used to the new handling characteris-
tics.
R Before driving, check:
- that the trailer tow hitch and ball coupling
are secure
- that the safety switch for a braked trailer
is functioning properly
- that the safety chains are secure and not
damaged
- that the electrical connections are secure
- that the lights are working
- that the wheels are in good order and the
tire pressure is correct
R Adjust the exterior mirrors to provide an
unobstructed view of the rear section of the
trailer.
R If the trailer is equipped with a separate
functional braking system, check before
each journey whether the brakes are func-
tioning correctly.
R Secure the load on the trailer according to
the applicable specifications and current
standards on securing loads
(Y page 244).
R When driving with a trailer, check at regular
intervals that the load is secured and that
the brakes and lights are working.
R Bear in mind that the handling will be less
stable when towing a trailer than when driv-
ing without one. Avoid sudden steering
movements.
R The vehicle/trailer combination is heavier,
accelerates more slowly and has a
decreased gradient climbing capability and a
longer braking distance.
It is more susceptible to crosswinds and
requires cautious steering.
R If possible, do not brake suddenly, but
rather moderately at first so that the trailer
can activate its brakes. Then increase the
force on the brake pedal.
R If the automatic transmission repeatedly
shifts between gears when driving on
inclines, restrict the shift range. Select shift
range 4, 3, 2 or 1.
Driving in a low gear and at a low speed
reduces the risk of damaging the engine. R
When driving on a downhill gradient, shift to
a low gear and take advantage of the
engine's braking effect.
Avoid continuous brake application as this
may overheat the vehicle brakes and, if
installed, the trailer brakes.
R If the coolant temperature increases dra-
matically while the air-conditioning system
is switched on, switch off the air-condition-
ing system.
Coolant heat can also be dissipated by
switching the airflow and the temperature of
the air conditioning to the maximum level.
Open the windows if necessary.
R When overtaking, pay particular attention to
the extended length of your vehicle/trailer
combination.
Due to the length of your vehicle/trailer
combination you need an additional dis-
tance before you can return to your original
lane. Uncoupling a trailer
G
WARNING
If you uncouple a trailer with the overrun
brake engaged, you could trap your hand
between the vehicle and the trailer drawbar.
There is a risk of injury.
Do not uncouple a trailer if the overrun
brake is engaged.
! Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound-
ing of the overrun brake.
X Make sure that the selector lever of the
automatic transmission is in position P.
X Engage the vehicle's parking brake.
X Close all doors.
X Apply the parking brake of the trailer.
X In addition, secure the trailer against rolling
away with a wheel chock or similar object.
X Remove the trailer cable and safety chains
and decouple the trailer. Towing a trailer
171
Driving and parking Z

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).Important safety notes
G
WARNING
If you operate information systems and com-
munication equipment integrated in the
vehicle when driving, you may be distracted
from the traffic situation. You could also
lose control of the vehicle. There is a risk of
an accident.
Only operate this equipment when the traffic
situation permits. If you are not sure that
this is possible, park the vehicle paying
attention to traffic conditions and operate
the equipment when the vehicle is station-
ary. G
WARNING
If you are driving and reach through the
steering wheel to operate the adjustment
knob, you could lose control of the vehicle.
There is a risk of an accident and injury.
Only operate the adjustment knobs when
the vehicle is stationary. Do not reach
through the steering wheel when driving.
You must observe the legal requirements for
the country in which you are currently driving
when operating the on-board computer. G
WARNING
If the instrument cluster has failed or mal-
functioned, you may not recognize function
restrictions in systems relevant to safety. The operating safety of your vehicle may be
impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately.
The on-board computer display only shows
messages and warnings from certain systems.
You should therefore make sure your vehicle is
operating safely at all times. If the operating
safety of your vehicle is impaired, stop the
vehicle as soon as possible, paying attention
to road and traffic conditions. Then consult a
qualified specialist workshop.
The accuracy of the speedometer and odome-
ter displays is legally prescribed. Determining
the speed is dependent on the wheel size or
the rolling circumference of the wheels. If you
change the wheel size on your vehicle, make
sure it is assigned to the correct wheel size
category ( Y page
278). If you change wheel
size category without recoding the control
unit, the speedometer indication will be inac-
curate. Driving safety and driving systems may
be impaired or detect a malfunction and shut
down.
An overview of the instrument cluster can be
found under "Instrument cluster":
R for vehicles without steering wheel buttons
(Y page 38)
R for vehicles with steering wheel buttons
(Y page 40) Display and operation
Instrument lighting
Brightness control knob (example: vehicle with
steering wheel buttons)174
Display and operation
On-board computer and displays

In daylight, the displays in the instrument clus-
ter are illuminated. A dimming function is not
possible in daylight.
On vehicles with steering wheel buttons, the
light sensor in the instrument cluster automat-
ically controls the brightness of the display
lighting.
While the lights are on, the brightness is
dependent upon the brightness of the ambient
light. You can also adjust the brightness of the
instrument lighting and the display lighting:
R by pressing the f and g buttons on the
instrument cluster on vehicles without
steering wheel buttons (not in the Settings
menu)
R by turning brightness control knob : on
vehicles with steering wheel buttons Speedometer
If you change the wheel size on your vehicle,
make sure it is assigned to the correct wheel
size category ( Y page
278). If you change
wheel size category without recoding the con-
trol unit, the speedometer indication will be
inaccurate. The current vehicle speed may
then be higher than the speed displayed in the
speedometer.
The speed can also be shown in the display in
the form of a digital speedometer:
R on vehicles without steering wheel buttons
(Y page 178)
R on vehicles with steering wheel buttons
(Y page 185)
i In some countries, a warning sounds
and/or the display shows a message when
the vehicle reaches the maximum legally
permissible speed limit, e.g. at 75 mph
(120 km/h). Tachometer
! Do not drive in the overrevving range, as
this could damage the engine. H
Environmental note
Avoid driving at high engine speeds. This
unnecessarily increases the fuel consump-
tion of your vehicle and harms the environ-
ment as a result of increased emissions. The red band in the tachometer indicates the
engine's overrevving range.
To protect the engine, the fuel supply is inter-
rupted when the red band is reached.
Outside temperature display
You should pay special attention to road con-
ditions when temperatures are around freezing
point.
Please bear in mind that the outside tempera-
ture display shows the air temperature meas-
ured and not the road temperature.
The display shows the outside temperature in
the header:
R on vehicles without steering wheel buttons
(Y page

176)
R on vehicles with steering wheel buttons
(Y page 183)
Changes in the outside temperature are dis-
played after a short delay. Coolant temperature gauge
G
WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
On vehicles without steering wheel buttons,
you can have the coolant temperature shown
in the display

(Y page 178).
On vehicles with steering wheel buttons, an
analog coolant temperature gauge is located
in the tachometer in the instrument cluster
(Y page 40). Under normal driving conditions and at the
correct coolant level, the display may rise to
the letter H or to the red mark. Display and operation
175
On-board computer and displays Z

On-board computer (vehicles with-
out steering wheel buttons)
Operating the on-board computer
Overview :
È and 3 buttons
; Display
= f and g buttons
X To activate the on-board computer: turn
the key to position 1 in the ignition lock.
If you remove the key, then quickly re-insert it
and turn to position 1, the on-board computer
and instrument cluster are not activated.
You can control the display messages and set-
tings in the on-board computer with but-
tons : and = on the instrument cluster.
Buttons on the instrument cluster G
WARNING
If you are driving and reach through the
steering wheel to operate the adjustment
knob, you could lose control of the vehicle.
There is a risk of an accident and injury.
Only operate the adjustment knobs when
the vehicle is stationary. Do not reach
through the steering wheel when driving. È Press briefly:
R Selects the menu or display
R in menu Settings, leaves the
submenu without adopting the
last setting and returns to the
main menu È Press and hold:
R
Returns to the standard display
or the Distance menu without
adopting the last setting 3 Press briefly:
R Selects a submenu or function
R Confirms the selected entry in
the list or the display, or confirms
the setting 3 Press and hold:
R
Resets the trip odometer and trip
computer values
R in the main menu of the Set‐
tings menu: resets settings to
the factory settings
R in menu Settings, resets values
and returns to the main menu f
g R
Sets the instrument cluster light-
ing (not in the Settings menu)
R Scrolls through lists
R Changes values or settings Display
Instrument cluster display
:
Clock (Y page 192)
V Cruise control (Y page
146)
; Permanent display: outside temperature or
speed

(Y page 180)176
On-board computer (vehicles without steering wheel buttons)
On-board computer and displays

Further information can be found under "ESP
®
(Electronic Stability Program)" ( Y page
69).
The vehicle must be stationary and the engine
must be running. Use the buttons in the instru-
ment cluster.
X Press È to select the Settings menu.
X Press 3 to select the ESP submenu.
The display shows the current status.
If the display shows the Oper. Only
Poss. With Engine On message, confirm
the message with 3 and start the engine.
The display then shows the ESP submenu
and the ESP ®
status.
If the ESP Inoperative message is shown
in the display, ESP is not available due to a
malfunction and is deactivated. If you con-
firm the message with 3, the display shows
the next submenu.
X Press f or g to activate or deactivate
ESP.
X Press 3 to confirm.
The next submenu is shown in the display.
If the å warning lamp in the instrument
cluster lights up when the vehicle is ready to
drive, ESP ®
is deactivated.
Observe the information on warning lamps
( Y page

230) and display messages
( Y page 200).
Setting the sensitivity of the rain sen-
sor The vehicle must be stationary. Use the but-
tons in the instrument cluster.
X Press È to select the Settings menu.
X Press 3 to select the Rain Sensor sub-
menu.
The display shows the current sensitivity
setting.
X Press f or g to select the Low, Standard
or Sensitive setting. This setting controls
the rain sensor's sensitivity to precipitation.
The windshield wiper will then wipe more or
less frequently at the same precipitation
intensity.
X Press 3 to confirm.
The next submenu is shown in the display.
You can find further information under "Wind-
shield wiper"
(Y page 109). Activating/deactivating ATTENTION
ASSIST The vehicle must be stationary. Use the but-
tons in the instrument cluster.
X Press È to select the Settings menu.
X Press 3 to select the Attention Assist
submenu.
The display shows the current status.
If the Attention Assist Inoperative
message is shown in the display, ATTEN-
TION ASSIST is not available due to a mal-
function and is deactivated. If you confirm
the message with 3, the display shows the
next submenu.
X Press f or g to activate or deactivate
ATTENTION ASSIST.
X Press 3 to confirm.
The next submenu is shown in the display.
Further information can be found under
"ATTENTION ASSIST"
(Y page 155).
Selecting the permanent display func-
tion With the Permanent Display: function, you
can switch the display in the header between
outside temperature and speed.
If the display shows the speed in the header,
the outside temperature is shown with the
odometers (Y page

177).
The additional speedometer unit in the header
is always inverse to the speedometer unit.
The vehicle must be stationary. Use the but-
tons in the instrument cluster.
X Using È select the Settings menu.
X Using 3 select the Permanent Display:
submenu.
The display indicates the selected setting of
Outside Temp. or Speedometer.
X Change the setting by pressing f or g.
X Press 3 to confirm.
The next submenu is shown in the display.
Selecting the unit for the distance In the
Distance Unit: submenu, you can
select whether the display shows certain infor-
mation in kilometers or miles. 180
On-board computer (vehicles without steering wheel buttons)
On-board computer and displays

You can also have the ATTENTION ASSIST
assessment or the attention level displayed
in the Status Overview.
X
To display the attention level: press :
and 9 to switch between the status
overview and the ATTENTION ASSIST
assessment.
The ATTENTION ASSIST assessment shows
the length of the journey since the last
break as well as the attention level detected
(Y page
155).
Deactivating/activating ESP ®This menu is only available on vehicles without
the å button on the center console.
Please observe the important safety notes
under "ESP ®
(Electronic Stability Program)"
(Y page

68). G
WARNING
If you deactivate ESP ®
, ESP ®
no longer sta-
bilizes the vehicle. There is an increased risk
of skidding and an accident.
Only deactivate ESP ®
in the situations
described 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
Further information can be found under "ESP ®
(Electronic Stability Program)"

(Y page 69).
X Start the engine. Using the steering wheel buttons
X Press = or ; to select the Assist.
menu.
X Press : or 9 to select ESP.
X Press a to confirm.
The current status is shown.
X To activate/deactivate: press a again.
If the å warning lamp in the instrument
cluster lights up when the vehicle is ready to
drive, ESP ®
is deactivated.
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

230) and display messages
(Y page 214).
Activating/deactivating the distance
warning function Using the steering wheel buttons
X Press = or ; to select the Assist.
menu.
X Press 9 or : to select Distance
Warning.
X Press a to confirm.
The current status is shown.
X To activate/deactivate: press the a
button again.
If the distance warning function of COLLI-
SION PREVENTION ASSIST is activated, the
display shows the Ä symbol in the
header.
At speeds up to approx 20 mph (30 km/h

),
the display in vehicles with Active Parking
Assist first shows the í status indicator.
Only up to a speed of about 20 mph
(30 km/h) does the display show the Ä
symbol instead of the í status indicator.
Further information can be found under "COL-
LISION PREVENTION ASSIST"
(Y page 149).
Setting ATTENTION ASSIST Using the steering wheel buttons
X Press = or ; to select the Assist.
menu.
X Press : or 9 to select Attention
Assist. 190
On-board computer (vehicles with steering wheel buttons)
On-board computer and displays

X
Press a to confirm.
The current setting is displayed.
X To change the setting: press a again.
X Press : or 9 to set Deactivated,
Standard or Sensitive.
X Press a to confirm the choice.
If ATTENTION ASSIST is activated, the À
symbol is shown in the status area of the
display. The selection Standard
or Sensi‐
tive sets the sensitivity with which the sys-
tem determines the attention level.
Further information can be found under
"ATTENTION ASSIST"
(Y page 155).
Activating/deactivating Blind Spot
Assist Using the steering wheel buttons
X Press = or ; to select the Assist.
menu.
X Press : or 9 to select Blind Spot
Assist.
X Press a to confirm.
The current status is shown.
X To activate/deactivate: press the a
button again.
Further information can be found under "Blind
Spot Assist"
(Y page 151).
Setting Lane Keeping Assist Using the steering wheel buttons
X Press = or ; to select the Assist.
menu.
X Press : or 9 to select Lane Keep‐
ing Assist.
X Press a to confirm.
The current selection Standard or Adap‐
tive is displayed.
X To change the setting: press a again.
Further information can be found under "Lane
Keeping Assist" (Y page
153). Service menu
Depending on the vehicle’s equipment, you
have the following options in the
Service
menu:
R Calling up display messages in the message
memory ( Y page

209)
R Restarting the tire pressure loss warning
system or checking the tire pressure elec-
tronically ( Y page 285)
R Calling up the service due date (ASSYST
PLUS) (Y page 258) Settings menu
Introduction Depending on the vehicle’s equipment, you
have the following options in the
Settings
menu:
R changing the display options in the Inst.
Cluster submenu

(Y page 192)
R changing the time and date in the Time/
Date submenu (Y page 192)
R changing the exterior and interior lighting
settings in the Lights submenu
(Y page 193) On-board computer (vehicles with steering wheel buttons)
191
On-board computer and displays Z

Safety systems
Display messages
Possible causes/consequences and
M SolutionsABS, ESP Inopera‐
tive
+
ABS, BAS, hill start assist, and ESP
®
as well as its driving safety sys-
tems are unavailable due to a malfunction.
ATTENTION ASSIST is deactivated and other driving systems could
be automatically deactivated.
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.
This causes steerability and braking to be greatly impaired. The
braking distance can increase in emergency braking situations.
If ESP ®
is not operational, ESP ®
will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
X Switch the engine off, wait briefly and start the engine again.
X Check if the display message has disappeared and ESP ®
is opera-
tional.
X If the display message continues to be displayed:
R Drive on with care.
R Visit a qualified specialist workshop immediately. ABS, ESP Curr.
Unavail.
+
ABS, BAS, hill start assist, and ESP
®
as well as its driving safety sys-
tems are temporarily unavailable.
ATTENTION ASSIST is deactivated and other driving systems could
be automatically 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.
This causes steerability and braking to be greatly impaired. The
braking distance can increase in emergency braking situations.
If ESP ®
is not operational, ESP ®
will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
X Drive on with care and on a suitable stretch of road make slight
steering movements at a speed above 12 mph (20 km/h ).
X Switch the engine off, wait briefly and start the engine again.
X Check if the display message has disappeared and ESP ®
is opera-
tional.
X If the display message continues to be displayed:
R Drive on with care.
R Visit a qualified specialist workshop immediately.196
Display messages (vehicles without steering wheel buttons)
On-board computer and displays