2020 MERCEDES-BENZ METRIS sensor

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

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

Use the buttons in the instrument cluster.
X Press È to select the ? coolant temper-
ature bar display.
Under normal driving conditions and at the
correct coolant level, the display may rise to
the letter H. Settings menu
Introduction Settings menu start screen
The vehicle must be stationary. Use the but-
tons in the instrument cluster. X To display: press È to select the Set‐
tings menu.
The Settings menu is only displayed when
the vehicle is stationary. You can think of the
order of the submenus and functions as a cir-
cle. Press 3 on the instrument cluster to
scroll through the menu and select its subme-
nus or functions successively.
If you scroll forward using 3, the setting from
the previous submenu or function is adopted.
If you press È in a submenu, the submenu or
function is exited without adopting the setting.
The display then shows the start screen of the
Settings menu.
Depending on the vehicle’s equipment, you
have the following options in the Settings
menu:
R Setting the language for the display mes-
sages and displays
(Y page 179)
R Deactivating and activating ESP ®
( Y page 179) R
Setting the sensitivity of the rain sensor
( Y page

180)
R Activating and deactivating ATTENTION
ASSIST (Y page 180)
R Selecting the permanent display in the
header of the display ( Y page 180)
R Setting the unit for distance, consumption
and speed displays (Y page 180)
R Setting the time and date ( Y page 181)
X To reset settings to the factory settings:
turn the key to position 1 in the ignition lock
and press and hold 3 in the Settings
menu for at least five seconds.
For safety reasons, not all functions are reset.
Setting the display language 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 Language submenu.
The display shows the current language
selection.
X Press f or g to set the language for all
display messages.
X Press 3 to confirm.
The next submenu is shown in the display.
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 On-board computer (vehicles without steering wheel buttons)
179
On-board computer and displays Z

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

X
Press : or 9 to select the Date:
function.
The display shows the current date.
X To set the date: press a again.
X Press = or ; to switch between day,
month and year.
X Press : or 9 to set the day, month or
year.
X Then press a to confirm.
The display shows the updated date.
Lights submenu Activating/deactivating the surround
lighting and exterior lighting delayed
switch-off
If you activate the Locator Lighting func-
tion and the light switch is turned to the Ã
position, the following functions are activated
when it is dark:
R surround lighting: the exterior lighting
remains on for
40 seconds after the doors
are unlocked. When you start the engine,
the surround lighting is deactivated and the
automatic headlamp feature is activated
(Y page 100).
R exterior lighting delayed switch-off: the
exterior lighting remains lit for 60 seconds
after the engine is switched off. When you
close all the doors and the tailgate/rear
doors, the exterior lighting switches off after
15 seconds.
Using the steering wheel buttons
X Use the = or ; button to select the
Settings. menu.
X Use : or 9 to select Lights.
X Press a to confirm.
X Use : or 9 to select the Locator
Lighting function.
The current status appears.
X To switch on/off: press a again.
If you change the setting, conversion does
not take place until the next time the vehicle
is stationary. Deactivating exterior lighting delayed switch-
off temporarily:
X Before leaving the vehicle, turn the key to
position g in the ignition lock.
X Turn the key to position 2 in the ignition
lock.
The exterior lighting delayed switch-off is
deactivated until the next time the engine is
started.
With surround lighting and exterior lighting
delayed switch-off, the following light up
depending on the vehicle's equipment:
R Parking lamps
R Fog lamps
R Low-beam headlamps
R Daytime running lamps
Activating/deactivating interior lighting
delayed switch-off If you activate the Interior Lighting
Delay: function, the interior lighting remains
lit for a further 20 seconds.
Using the steering wheel buttons
X Use the = or ; button to select the
Settings. menu.
X Use : or 9 to select Lights.
X Press a to confirm.
X Use : or 9 to select the Interior
Lighting Delay function.
The current status appears.
X To switch on/off: press a again.
Vehicle submenu Setting the sensitivity of the rain sensor
Using the steering wheel buttons
X Press = or ; to select the Settings
menu.
X Press : or 9 to select Vehicle.
X Press a to confirm.
X Press : or 9 to select the Rain
Sensor Sensitivity function.
The display shows the current setting.
X Press a to change the setting.
X Press : or 9 to select the High,
Standard or Low setting. This setting con-
trols the rain sensor's sensitivity to precipi-
tation. The windshield wiper then wipes On-board computer (vehicles with steering wheel buttons)
193
On-board computer and displays Z

Lights
Display messages
Possible causes/consequences and
M Solutionsb
Check Left Low Beam
or
Check Right Low
Beam The left or right-hand low-beam headlamp is faulty.
X
Change the bulb ( Y page 105).b
Chk. Trailer L.
Turn Sig.

or Chk.
Trailer R. Turn
Sig. The left or right-hand trailer turn signal lamp is faulty.
X
Change the bulb (see the trailer manufacturer's operating instruc-
tions). b
Chk. Trailer Brake
Lamp The trailer brake lamp is faulty.
X Change the bulb (see the trailer manufacturer's operating instruc-
tions). b
Chk. Trailer L.
Tail Lamp

or Chk.
Trailer R. Tail
Lamp The left or right-hand trailer tail lamp is faulty.
X Change the bulb (see the trailer manufacturer's operating instruc-
tions). b
Auto Lamps Inopera‐
tive The light sensor is faulty. The automatic headlamp feature is mal-
functioning.
X
Switch the light functions on/off manually (Y page
99).
X Visit a qualified specialist workshop. b
Chk. Rear L. Turn
Signal

or Chk.
Rear R. Turn Signal The rear left-hand or rear right-hand turn signal is faulty.
X Change the bulb (Y page 105).b
Chk. Front L. Turn
Signal

or Chk.
Front R. Turn Sig‐
nal The front left-hand or front right-hand turn signal is faulty.
X Change the bulb (Y page 105).b
Chk. Center Brake
Lamp The high-mounted brake lamp is faulty.
X
Visit a qualified specialist workshop. b
Chk. L. Tail/
Brake Lamp

or Chk.
R. Tail/ Brake Lamp The left or right-hand tail lamp/brake lamp is faulty.
X Change the bulb (Y page 105).202
Display messages (vehicles without steering wheel buttons)
On-board computer and displays

Display messages
Possible causes/consequences and
M SolutionsTire Press. Moni‐
tor Currently
Unavail. Due to a source of radio interference, no signals can be received
from the wheel sensors. The tire pressure monitor is temporarily
malfunctioning.
The tire pressure monitor restarts automatically as soon as the
problem has been solved. Tire Press. Moni‐
tor Inoperative The tire pressure monitor is malfunctioning and switched off. Either
the installed wheels do not have suitable tire pressure sensors or
the system is malfunctioning, e.g. because a tire pressure sensor is
faulty.
X Install wheels with suitable tire pressure sensors.
The tire pressure monitor is activated automatically after driving
for a few minutes.
or X Visit a qualified specialist workshop. Vehicle
Display messages
Possible causes/consequences and
M SolutionsÒ The tailgate is open.
X Close the tailgate. Ñ The rear door is open.
X Close the rear door(s). Ó An additional warning tone sounds. The hood is open.
G WARNING
The open hood may then block your view when the vehicle is in
motion.
There is a risk of an accident.
X Stop the vehicle immediately, paying attention to road and traffic
conditions.
X Secure the vehicle to prevent it from rolling away (Y page 138).
X Close the hood. 0 An additional warning tone sounds while the vehicle is in motion.
The display shows the open door(s).
X Close all doors. Ð
Pwr. Steering Mal‐
funct.
+ An additional warning tone sounds. The steering power assistance
could be malfunctioning. You may need to steer more forcefully.
X Carefully continue to a qualified specialist workshop and have the
steering checked immediately. 208
Display messages (vehicles without steering wheel buttons)
On-board computer and displays

Lights
Display messages
Possible causes/consequences and
M Solutionsb
Check Left Low Beam
or
Check Right Low
Beam The left or right-hand low-beam headlamp is faulty.
X
Change the bulb ( Y page 105).b
Check Trailer Left
Turn Signal

or
Check Trailer
Right Turn Signal The left or right-hand trailer turn signal lamp is faulty.
X
Change the bulb (see the trailer manufacturer's operating instruc-
tions). b
Check Trailer
Brake Lamp The trailer brake lamp is faulty.
X Change the bulb (see the trailer manufacturer's operating instruc-
tions). b
Check Trailer Left
Tail Lamp

or Check
Trailer Right Tail
Lamp The left or right-hand trailer tail lamp is faulty.
X Change the bulb (see the trailer manufacturer's operating instruc-
tions). b
Auto Lamp Function
Inoperative The light sensor is faulty. The automatic headlamp feature is mal-
functioning.
X
Switch the light functions on/off manually (Y page
99).
X Visit a qualified specialist workshop. b
Check Rear Left
Turn Signal

or
Check Rear Right
Turn Signal The rear left-hand or rear right-hand turn signal is faulty.
X Change the bulb (Y page 105).b
Check Front Left
Turn Signal

or
Check Front Right
Turn Signal The front left-hand or front right-hand turn signal is faulty.
X Change the bulb (Y page 105).b
Check Center Brake
Lamp The high-mounted brake lamp is faulty.
X
Visit a qualified specialist workshop.216
Display messages (vehicles with steering wheel buttons)
On-board computer and displays