2014 MERCEDES-BENZ CL-Class brake
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Display messages Possible causes/consequences and
M Solutions
PRE-SAFE
Function Currently
Limited See
Operator's Manual PRE-SAFE
®
Brake is temporarily inoperative. Possible causes are:
R the DISTRONIC PLUS cover in the radiator trim is dirty
R function is impaired due to heavy rain or snow.
R the sensors in the bumpers are dirty.
R the rada rsensor 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.
If the display message does not disappear:
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 289).
X Clean the DISTRONIC PLUS cover in the radiator trim
(Y page 431).
X Clean the bumpers (Y page 431).
X Restart the engine.
If the system detects that the sensors are fully operational, the
display message disappears.
PRE-SAFE ®
Brake is operational again. PRE-SAFE
Function Limited
See Operator's
Manual PRE-SAFE
®
Brak eisd efective. BAS PLUS or the distanc ewarning
signal may also have failed.
X Visi taqualified specialist workshop. 6
SRS Malfunction
Service Required There is a malfunction in the SRS (Supplemental Restraint
System). The
6warning lamp also lights up in the instrument
cluster.
G WARNING
The air bags or Emergency Tensioning Devices may either be
triggered unintentionally or, in the event of an accident, may not
be triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop. 362
Display messagesOn-board computer and displays
Page 366 of 494
Display messages Possible causes/consequences and
M Solutions
Front Passenger
Airbag Disabled
See Operator's
Manual The front-passenger air bag is disabled during the journey, even
though:
R
an adult
or
R a person larger than a certain size is occupying the front-
passenger seat
If additional forces are applied to the seat, the system may
interpret the occupant's weight as lowe rthan it actually is.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Apply the parking brake.
X Switch the ignition off.
X Have the occupant get out of the vehicle.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
Observe the PASSENGER AIR BAG OFF indicator lamp
(Y page 50) and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the PASSENGER AIR BAG OFF indicator lamp must light up and
remain lit. If the indicator lamp is on, OCS (Y page 50) has
deactivated the front-passenger air bag.
R The Front Passenger Airbag Enabled See Oper. Manual or
Front Passenger Airbag Disabled See Oper.
Manual display messages must not appearint
he multifunction
display.
X Wait for a period of at least 60 seconds until the necessary
system checks have been completed.
X Make sure that the display messages do not appearint he
multifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the PASSENGER AIR BAG OFF indicator
lamp remains lit or goes out depends on how OCS classifies the
occupant.
If the conditions are not fulfilled, the system is not operating
correctly.
X Visit a qualified specialist workshop immediately. 364
Display messagesOn-board computer and displays
Page 368 of 494
Display messages Possible causes/consequences and
M Solutions
Front Passenger
Airbag Enabled
See Operator's
Manual The front-passenger air bag is enabled during the journey, even
though:
R
a child, a small adult or an objec tweighing less than the
system's weight threshold is located on the front-passenger
seat
or
R the front-passenger seat is unoccupied
The system may detec tobjects or forces applying additional
weight on the seat.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Apply the parking brake.
X Switch the ignition off.
X Open the front-passenger door.
X Remove the child and the child restraint system from the front-
passenger seat.
X If necessary, secure the child in a child restraint system on a
suitable rear seat.
X Make sure that there are no objects on the seat adding to the
weight.
The system may otherwise detec tthe additional weight and
interpret the seat occupant's weight as greater than it actually
is.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
Observe the PASSENGER AIR BAG OFF indicator lamp
(Y page 50) and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the PASSENGER AIR BAG OFF indicator lamp must light up and
remain lit. If the indicator lamp is on, OCS (Y page 50) has
deactivated the front-passenger air bag.
R The Front Passenger Airbag Enabled See Operator's Manual or
Front Passenger Airbag Disabled See Operator's Manual display messages must not appearint
he
multifunction display.
X Wait for a period of at least 60 seconds until the necessary
system checks have been completed.
X Make sure that the display messages do not appearint he
multifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the PASSENGER AIR BAG OFF indicator 366
Display messagesOn-board computer and displays
Page 370 of 494
Display messages Possible causes/consequences and
M Solutions
b
Check Front Left
Turn
Signal or
Check Front Right Turn
Signal The front left-hand or front right-hand turn signal is defective.
X
Chec kwhether you are permitted to change the bulb yourself
(Y page 256).
or
X Visit a qualified specialist workshop. b
Check Left Mirror
Turn
Signal or
Check Right Mirror Turn
Signal The turn signal in the left-hand or right-hand exterior mirror is
defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 256).
or
X Visit a qualified specialist workshop. b
Check
Center Brake
Lamp The high-mounted brake lamp is faulty.
X
Check whether you are permitted to change the bulb yourself
(Y page 256).
or
X Visit a qualified specialist workshop. b
Check Left Tail
and Brake
Lamp or
Check Right
Tail and Brake Lamp The left or right-hand tail lamp/brake lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 256).
or
X Visit a qualified specialist workshop. b
Check Left High
Beam or
Check Right
High Beam The left or right-hand high beam is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 256).
or
X Visit a qualified specialist workshop. b
Check
Left License
Plate Lamp or
Check Right License
Plate Lamp The left or right-hand license plate lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 256).
or
X Visit a qualified specialist workshop. 368
Display messagesOn-board computer and displays
Page 376 of 494
Display messages Possible causes/consequences and
M Solutions
4
Engine Oil Level
Low Stop Vehicle
Turn Engine Off Vehicles without an oil dipstick
:the engine oil level is too low.
There is a risk of engine damage.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Apply the parking brake.
X Add engine oil (Y page 423) and check the oil level
(Y page 421). 4
Engine Oil Level
Too High Vehicles without an oil dipstick: you have added too much engine
oil. There is a risk of damage to the engine or to the catalytic
converter.
X
Have the excess oil siphoned off at a qualified specialist
workshop. Observe the legal requirements. 4
Engine Oil Level
Cannot measure
eng. oil level Vehicles without an oil dipstick: the measuring system is
defective.
X
Visit a qualified specialist workshop. 8
Reserve fuel level The fuel level has dropped into the reserve range.
X
Refuel at the nearest gas station. C There is only a very small amount of fuel in the fuel tank.
X
Refuel at the nearest gas station without fail. 8
Fuel filler cap
open The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
X
Check that the fuel filler cap is correctly closed.
If the fuel filler cap is not correctly closed:
X Close the fuel filler cap.
If the fuel filler cap is correctly closed:
X Visit a qualified specialist workshop. 374
Display messagesOn-board computer and displays
Page 383 of 494
Display messages Possible causes/consequences and
M Solutions
DISTRONIC PLUS
Currently
Unavailable See
Operator's Manual DISTRONIC is deactivated and temporarily inoperative. Possible
causes are:
R
the DISTRONIC PLUS cover in the radiator trim is dirty
R function is impaired due to heavy rain or snow.
R the sensors in the bumpers are dirty.
R the rada rsensor 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.
Aw arning tone also sounds.
If the display message does no tdisappear:
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 289).
X Clean the DISTRONIC PLUS cover in the radiator trim
(Y page 431).
X Clean the bumpers (Y page 431).
X Restar tthe engine.
If the system detects that the sensors are fully operational, the
display message disappears.
DISTRONIC is operational again. DISTRONIC PLUS
Inoperative DISTRONIC PLUS is defective. BAS PLUS (Brake Assist PLUS) and
PRE-SAFE
®
Brake may be inoperative as well.
Aw arning tone also sounds.
X Visi taqualified specialist workshop. DISTRONIC PLUS
Override You have depressed the accelerator pedal. DISTRONIC PLUS is no
longer controlling the speed of the vehicle.
X
Remove your foot from the accelerator pedal. DISTRONIC PLUS
--- mph An activation condition for DISTRONIC PLUS is not fulfilled.
X
Check the activation conditions for DISTRONIC PLUS
(Y page 298). Display messages
381On-board computer and displays Z
Page 385 of 494
Display messages Possible causes/consequences and
M Solutions
Check
tire(s) The tire pressure in one or more tires has dropped significantly.
The wheel position is displayed in the multifunction display.
Aw
arning tone also sounds.
G WARNING
With tire pressures which are too low, there is a ris kofthe
following hazards:
R they may burst, especially as the load and vehicle speed
increase.
R they may wear excessively and/or unevenly, which may greatly
impair tire traction.
R the driving characteristics, as well as steering and braking, may
be greatly impaired.
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 as you do so.
X Secure the vehicle against rolling away (Y page 289).
X If there is a flat tire, inspect the tires (Y page 437).
X Check the tire pressure (Y page 461).
X If necessary, correct the tire pressure. Caution,
tire defect The tire pressure in one or more tires has dropped suddenly. The
wheel position is shown in the multifunction display.
G WARNING
If you drive with a flat tire, there is a risk of the following hazards:
R A flat tire affects the ability to steer or brake the vehicle.
R You could 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 as you do so.
X Secure the vehicle against rolling away (Y page 289).
X If there is a flat tire, inspect the tires (Y page 437).Please correct
tire pressure(s) 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 pressures at the next opportunity. If necessary,
correct the tire pressure (Y page 461).
X Restart the tire pressure monitor (Y page 464). Display messages
383On-board computer and displays Z
Page 386 of 494
Display messages Possible causes/consequences and
M Solutions
Wheel sensor(s)
missing There is no signal from the tire pressure sensor of one or several
wheels. The pressure of the affected tire is no
tdisplayed in the
multifunction display.
X Have the faulty tire pressure sensor replaced at a qualified
specialist workshop. tire press. monitor
currently
unavailable Due to a source of radio interference, no signals can be received
fro
mt he wheel sensors. The tire pressure monitor is temporarily
malfunctioning.
X Drive on.
The tire pressure monitor restarts automatically as soon as the
problem has been solved. h
tire pressure
Caution, tire
defect The tire pressure in one or more tires has dropped suddenly.
Aw
arning tone also sounds.
G WARNING
If you drive with a flat tire, there is a ris kofthe following hazards:
R A flat tire affects the ability to steer or brake the vehicle.
R You could 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 as you do so.
X Secure the vehicle against rolling away (Y page 289).
X If there is a flat tire, inspect the tires (Y page 437).384
Display messagesOn-board computer and displays