2020 MERCEDES-BENZ METRIS air condition

Display messages
Possible causes/consequences and
M SolutionsÂ
Obtain a New Key The SmartKey needs to be replaced.
X Visit a qualified specialist workshop. ¥
Add Washer Fluid The washer fluid level in the washer fluid reservoir has dropped
below the minimum.
X Add washer fluid (Y page 256).Display messages (vehicles with steering wheel buttons)
Introduction
Important safety notes G
WARNING
If the instrument cluster has failed or malfunctioned, you may not recognize function restric-
tions 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 immediately.
The on-board computer only shows messages or warnings from certain systems in the instru-
ment cluster display. 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.
Display messages with graphic symbols are simplified in the Operator's Manual and may differ
from the symbols in the display. The display shows high-priority display messages in red. A warn-
ing tone sounds with certain display messages.
Please respond in accordance with the display messages and follow the additional notes in this
Operator's Manual.
You can hide low-priority display messages using the a or % steering wheel button. The
display messages are then stored in the message memory. Rectify the cause of a display mes-
sage as soon as possible.
High-priority display messages cannot be hidden. These messages will continue to be shown in
the display until their cause has been eliminated.
Message memory The on-board computer stores certain display messages in the
message memory. You can call
up the stored display messages. Using the steering wheel buttons
X Press = or ; to select the Service menu.
X Press : or 9 to select Messages.
The line shows the number of stored messages.
X Press a to confirm.
The first stored display message appears in the display.
If there are no display messages, the display shows No Messages.Display messages (vehicles with steering wheel buttons)
209
On-board computer and displays Z

Display messages
Possible causes/consequences and
M SolutionsFront Passenger
Airbag Disabled
See Operator's Man‐
ual The co-driver's air bag is deactivated during the journey even
though the co-driver's seat is occupied by an adult or a person with
a stature corresponding to that of an adult.
If additional forces are applied to the seat or the occupant is not sit-
ting on the seat properly (Y page
54), the weight the system
detects may be too low.
G WARNING
The co-driver's front air bag will not deploy in the event of an acci-
dent.
There is an increased risk of injury.
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 Switch off the ignition.
X The co-driver must get out of the vehicle.
X Make sure that the co-driver's seat is unoccupied, close the co-
driver's door and switch on the ignition.
X Observe the PASSENGER AIRBAG OFF indicator lamp in the cen-
ter console and the display messages and check the following:
Seat unoccupied and ignition switched on: R The PASSENGER AIRBAG OFF indicator lamp must light up contin-
uously. If the indicator lamp is on, the Occupant Classification
System (OCS) has disabled the co-driver's air bag

(Y page 54).
R The display must not show the messages Front Passenger
Airbag Enabled See Operator's Manual or Front
Passenger Airbag Disabled See Operator's Manual.
X Wait for at least one minute until the necessary system checks
have been completed.
X Ensure that the display does not show either of the two display
messages about the co-driver's front air bag.
If these conditions are met, the co-driver's seat can be occupied
again.
If these conditions are not met, the Occupant Classification System
(OCS) is malfunctioning.
X Visit a qualified specialist workshop immediately.
Further information on the Occupant Classification System (OCS)
can be found under "Occupant Classification System (OCS)"
(Y page

54). Display messages (vehicles with steering wheel buttons)
211
On-board computer and displays Z

Display messages
Possible causes/consequences and
M SolutionsFront Passenger
Airbag Enabled See
Operator's Manual The co-driver's front air bag is enabled during the journey even
though the co-driver's seat:
R is occupied by a child in a child restraint system, or a person of
small stature
or
R is not occupied.
The system may detect objects or forces that are adding to the
weight applied to the seat.
G WARNING
The co-driver's air bag may deploy unintentionally.
There is an increased risk of injury.
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 Switch off the ignition.
X Open the front-passenger door.
X Remove the child and the child restraint system from the co-driv-
er's seat.
X Make sure there are no objects applying additional weight to the
seat.
The system may otherwise detect the additional weight and inter-
pret the vehicle seat occupant's weight as greater than it actually
is.
X Make sure that the co-driver's seat is unoccupied, close the co-
driver's door and switch on the ignition.
X Observe the PASSENGER AIRBAG OFF indicator lamp in the cen-
ter console and the display and check the following:
Seat unoccupied and ignition switched on:
R The PASSENGER AIRBAG OFF indicator lamp must light up contin-
uously. If the indicator lamp is on, the Occupant Classification
System (OCS) has disabled the co-driver's air bag

(Y page 54).
R The display must not show the messages Front Passenger
Airbag Enabled See Operator's Manual or Front
Passenger Airbag Disabled See Operator's Manual.
X Wait for at least one minute until the necessary system checks
have been completed.
X Ensure that the display does not show either of the two display
messages about the co-driver's front air bag.
If these conditions are met, the co-driver's seat can be occupied
again. Observe the notes on the Occupant Classification System
(OCS) ( Y page

54).212
Display messages (vehicles with steering wheel buttons)
On-board computer and displays

Display messages
Possible causes/consequences and
M SolutionsIf these conditions are not met, the Occupant Classification System
(OCS) is malfunctioning.
X Install the child restraint system on a suitable rear seat.
or X Seat a person of smaller stature on a suitable rear seat.
X Visit a qualified specialist workshop immediately.
Further information on the Occupant Classification System (OCS)
can be found under "Occupant Classification System (OCS)"
(Y page
54). Check Brake Pad
Wear The brake pads/linings have reached their wear limit.
X Visit a qualified specialist workshop. $ (USA only)
J (Canada only)
Check Brake Fluid
Level There is insufficient brake fluid in the brake fluid reservoir.
G WARNING
Braking performance can be impaired.
There is a risk of an accident.
X Stop the vehicle immediately, paying attention to road and traffic
conditions. Do not continue driving under any circumstances.
X Secure the vehicle to prevent it from rolling away (Y page
138).
X Do not add brake fluid. Adding more will not remedy the malfunc-
tion.
X Consult a qualified specialist workshop immediately. T
ò÷
Inoperative See
Operator's Manual EBD is unavailable due to a malfunction. ABS, BAS, hill start assist
and ESP
®
as well as its driving safety systems, for example, are
therefore also unavailable.
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 prematurely
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.
X Visit a qualified specialist workshop immediately. Display messages (vehicles with steering wheel buttons)
213
On-board computer and displays Z

Engine
Display messages
Possible causes/consequences and
M Solutions# An additional warning tone sounds. The battery is not being
charged.
Possible causes:
R faulty alternator
R torn poly-V-belt
R a malfunction in the electronics
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
! Do not drive any further. Otherwise the engine may overheat.
X Secure the vehicle to prevent it from rolling away ( Y page 138).
X Consult a qualified specialist workshop. ?
Coolant Too Hot:
Stop Vehicle Turn
Engine Off An additional warning tone sounds. The coolant is too hot.
G WARNING
Never drive with an overheated engine. Driving when the engine is
overheated can cause fluids which may have leaked into the engine
compartment to catch fire.
In addition, steam from an overheated engine can cause serious
burns, which can occur just by opening the hood.
There is a risk of injury.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Secure the vehicle to prevent it from rolling away ( Y page
138).
X Wait until the engine has cooled down.
X Make sure that the air supply to the radiator is not obstructed, by
frozen slush for example.
X Do not start the engine again until the display message goes out
and the coolant temperature is below the maximum value speci-
fied. The engine could otherwise be damaged.
X Monitor the ? coolant temperature gauge in the instrument
cluster.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and at the correct coolant level,
the display may rise to the red mark. Display messages (vehicles with steering wheel buttons)
219
On-board computer and displays Z

Display messages
Possible causes/consequences and
M SolutionsCollision Preven‐
tion Assist Inoper‐
ative COLLISION PREVENTION ASSIST PLUS is not available due to a mal-
function.
X Visit a qualified specialist workshop. Collision Preven‐
tion Assist Cur‐
rently Unavail.
See Oper. Manual COLLISION PREVENTION ASSIST PLUS is temporarily inoperative.
Possible causes:
R The sensors in the front bumper are dirty.
R The function is impaired due to heavy rain or snow.
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations
or other sources of electromagnetic radiation.
R The system is outside the operating temperature range.
R The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out and COLLISION PREVENTION ASSIST is operational again.
If the display message does not disappear:
X Pull over and stop the vehicle, paying attention to road and traffic
conditions.
X Secure the vehicle to prevent it from rolling away (Y page 138).
X Switch off the engine.
X Clean the sensors in the front bumper (Y page
267).
X Restart the engine. Lane Keeping
Assist Inoperative Lane Keeping Assist is faulty.
X Visit a qualified specialist workshop. Lane Keeping
Assist Currently
Unavail. See Oper.
Manual Lane Keeping Assist is deactivated and temporarily inoperative.
Possible causes:
R The windshield is dirty in the camera's field of vision.
R Visibility is impaired due to heavy rain, snow or fog.
R There are no lane markings for an extended period.
R The lane markings are worn away, dark or covered, e.g. by dirt or
snow.
Once the causes listed above no longer apply, the display message
goes out and Lane Keeping Assist is operational again.
If the display message does not disappear:
X Pull over and stop the vehicle, paying attention to road and traffic
conditions.
X Secure the vehicle to prevent it from rolling away (Y page
138).
X Clean the windshield.222
Display messages (vehicles with steering wheel buttons)
On-board computer and displays

Display messages
Possible causes/consequences and
M SolutionsCruise Control
- - - mph A condition for activating cruise control has not been met.
You have tried to store a speed below
20 mph (30 km/h) for exam-
ple.
X If conditions permit, drive faster than 20 mph (30 km/h) and
store the speed.
X Check the activation conditions for cruise control (Y page
147).Blind Spot Assist
Inoperative Blind Spot Assist is faulty.
X Visit a qualified specialist workshop. Blind Spot Assist
Currently Unavail.
See Operator's Man‐
ual Blind Spot Assist is temporarily inoperative. Possible causes:
R You have attached a trailer.
R The sensors in the rear bumper are dirty.
R The function is impaired due to heavy rain or snow.
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations
or other sources of electromagnetic radiation.
R The system is outside the operating temperature range.
Once the causes listed above no longer apply, the display message
goes out and Blind Spot Assist is operational again.
If the display message does not disappear:
X Pull over and stop the vehicle, paying attention to road and traffic
conditions.
X Secure the vehicle to prevent it from rolling away ( Y page
138).
X Switch off the engine.
X Clean the sensors in the rear bumper (Y page
267).
X Restart the engine. Display messages (vehicles with steering wheel buttons)
223
On-board computer and displays Z

Tires
Display messages
Possible causes/consequences and
M SolutionsAdjust Tire Pres‐
sure The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
X Check the tire pressure at the next opportunity (Y page 285).
X If necessary, correct the tire pressure.
X Restart the tire pressure monitor ( Y page
288).Check Tires An additional warning tone sounds.
The tire pressure in one or more tires has dropped significantly. The
display shows the wheel position.
G WARNING
Underinflated tires pose the following risks:
R The tires may burst, especially as the load and vehicle speed
increase.
R The tires may wear excessively and/or unevenly, which may
greatly impair tire traction.
R The handling as well as steering and braking characteristics may
be severely affected.
There is a risk of an accident.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions while doing so.
X Secure the vehicle to prevent it from rolling away (Y page
138).
X Check the tires and, if necessary, change the wheel
(Y page

297).
X Check the tire pressure (Y page
285).
X If necessary, correct the tire pressure. Warning Tire Mal‐
function The tire pressure in one or more tires has dropped suddenly. The
display shows the wheel position.
G WARNING
Driving with a flat tire poses a risk of the following hazards: R A flat tire affects the ability to steer or brake the vehicle.
R You could then lose control of the vehicle.
R Continued driving with a flat tire will cause excessive heat build-
up and possibly a fire.
There is a risk of an accident.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions while doing so.
X Secure the vehicle to prevent it from rolling away (Y page
138).
X Check the tires and, if necessary, change the wheel
(Y page

297).224
Display messages (vehicles with steering wheel buttons)
On-board computer and displays