Page 174 of 290

Display messages Possible causes/consequences and
0050
0050Solutions Front Passenger
Front Passenger
Airbag Disabled Airbag Disabled
See Operator's See Operator's
Manual Manual The front-passenger air bag and front-passenger knee bag are
deactivated during the journey, although:
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 lower than it actually is.
G WARNING
The front-passenger front air bag and front passenger knee bag
may not be triggered in the event of an accident.
There is an increased risk of injury.
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 00730074(Ypage 42) indicator lamp and the
multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the 00730074 indicator lamp must light up and remain lit. If the
indicator lamp is on, OCS ( Ypage 42) has disabled the front-
passenger air bag.
R the Front Passenger Airbag Enabled See Operator's
Front Passenger Airbag Enabled See Operator's
Manual Manual orFront Passenger Airbag Disabled See
Front Passenger Airbag Disabled See
Operator's Manual
Operator's Manual display messages must not be shown in
the multifunction display. Wait for a period of at least
60 seconds until the necessary system checks have been
completed. This is necessary and ensures that the display
messages do not appear in the multifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the 00730074indicator 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. 172
Display
messagesOn-board computer and displays
Page 175 of 290

Display messages Possible causes/consequences and
0050
0050Solutions 0053
Tele Aid Tele Aid
Inoperative Inoperative One or more main features of the mbrace system are
malfunctioning.
X
Have the mbrace system checked immediately at a qualified
specialist workshop. 0075
SRS Malfunction SRS Malfunction
Service Required Service Required There is a malfunction in the SRS (Supplemental Restraint
System). The
0075warning 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.
For further information about SRS, see (Y page 37).0075
Front Left SRS Front Left SRS
Malfunction Malfunction
Service Required Service Required
or
Front Right SRS Front Right SRS
Malfunction Malfunction
Service Required Service Required SRS has malfunctioned at the front on the left or right. The
0075
warning lamp also lights up in the instrument cluster.
G WARNING
If SRS is malfunctioning, individual systems may be triggered
unintentionally or might not be triggered in the event of an
accident with a high rate of vehicle deceleration. In this condition,
the restraint system provides only restricted protection.
X Visit a qualified specialist workshop. Lights
i Display messages about LEDs:
The display message will only appear if all or a number of LEDs have failed. Display
messages
173On-board computer and displays Z
Page 176 of 290

Display messages Possible causes/consequences and
0050
0050Solutions 0049
Check Check
Left
LeftLow
LowBeam
Beam
or
Check Right Low Check Right Low
Beam Beam The left or right-hand low-beam headlamp does not light up. In
addition, the high-beam headlamp is also inoperative.
X
Visit a qualified specialist workshop. 0049
AUTO AUTO
Lamp
LampFunction
Function
Inoperative
Inoperative The light sensor is defective.
USA only:
X
Switch off the daytime running lamps in the on-board computer
(Y page 158).
X Switch the lights on and off using the light switch. 0049
Check Rear Left Check Rear Left
Turn Signal Turn Signal
or
Check Rear Right Check Rear Right
Turn Signal Turn Signal The LEDs in the rear left or right-hand indicator lamp do not light
up.
X
Visit a qualified specialist workshop. 0049
Check Left Mirror Check Left Mirror
Turn Signal Turn Signal
or
Check Check
Right
RightMirror
Mirror
Turn Signal
Turn Signal None of the LEDs in the left or right-hand exterior mirrors light up.
X
Visit a qualified specialist workshop. 0049
Check Front Left Check Front Left
Turn Signal Turn Signal
or
Check Front Right Check Front Right
Turn Signal Turn Signal The LEDs in the front left or right-hand indicator lamp do not light
up.
X
Visit a qualified specialist workshop. 0049
Check Check
Center
Center Brake
Brake
Lamp
Lamp None of the LEDs in the high-mounted brake lamp light up.
X
Visit a qualified specialist workshop. 174
Display
messagesOn-board computer and displays
Page 177 of 290

Display messages Possible causes/consequences and
0050
0050Solutions 0049
Check Left Brake Check Left Brake
Lamp Lamp
or
Check Right Brake Check Right Brake
Lamp Lamp The left or right-hand brake light LEDs do not light up.
X
Visit a qualified specialist workshop. 0049
Check Left Tail Check Left Tail
Lamp Lamp
or
Check Right Tail Check Right Tail
Lamp Lamp The left or right-hand tail lamp LEDs do not light up.
X
Visit a qualified specialist workshop. 0049
Check Left High Check Left High
Beam Beam
or
Check Right High Check Right High
Beam Beam The left or right-hand low-beam headlamp does not light up.
X
Visit a qualified specialist workshop. 0049
Check Check
Left
LeftLicense
License
Plate Lamp
Plate Lamp
or
Check Right Check Right
License Plate Lamp License Plate Lamp The left or right-hand license plate lamp does not light up.
X
Replace the bulb (Y page 101). 0049
Backup Light Backup Light None of the LEDs in the backup lamp light up.
X
Visit a qualified specialist workshop. 0049
Check Check
Left
LeftDaytime
Daytime
Running Light
Running Light
or
Check Right Check Right
Daytime Running Daytime Running
Light Light The LEDs in the left or right-hand daytime running lamp do not
light up. As a result, the corresponding side/standing lamp has
failed.
X
Visit a qualified specialist workshop. Display
messages
175On-board computer and displays Z
Page 178 of 290

Display messages Possible causes/consequences and
0050
0050Solutions 0049
Check Front Left Check Front Left
Sidemarker Lamp Sidemarker Lamp
or
Check Front Right Check Front Right
Sidemarker Lamp Sidemarker Lamp The left or right front side marker lamp is defective.
X
Visit a qualified specialist workshop. 0049
Check Rear Left Check Rear Left
Sidemarker Lamp Sidemarker Lamp
or
Check Rear Right Check Rear Right
Sidemarker Lamp Sidemarker Lamp The rear left or right side marker lamp is defective.
X
Visit a qualified specialist workshop. 0049
Check Front Left Check Front Left
Parking Lamp Parking Lamp
or
Check Front Right Check Front Right
Parking Lamp Parking Lamp The front left or front right parking or standing lamp is defective.
X
Visit a qualified specialist workshop. 0049
Switch Off Lights Switch Off Lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to 0058.0049
Malfunction See Malfunction See
Operator's Manual Operator's Manual The exterior lighting is defective.
X
Visit a qualified specialist workshop. 176
Display
messagesOn-board computer and displays
Page 179 of 290

Engine
Display messages Possible causes/consequences and
0050
0050Solutions 00AC
Coolant Low Stop Coolant Low Stop
Vehicle Turn Vehicle Turn
Engine Off Engine Off The coolant is too hot. In addition, the
00ACwarning lamp in the
instrument cluster lights up and a warning tone sounds.
G WARNING
Do not drive when your engine is overheated. This can cause some
fluids which may have leaked into the engine compartment to
catch fire.
Steam from the overheated engine can also cause serious burns
which can occur just by opening the hood.
There is a risk of injury.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 131).
X Wait until the engine has cooled down.
X Make sure that the air supply to the radiator is not blocked, e.g.
by snow, slush or ice.
X Wait until the display message disappears before restarting the
engine. Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the coolant temperature increases again, visit a qualified
specialist workshop immediately.
! If the coolant temperature is over 248 ‡ (120 †), do not
continue driving. The engine will otherwise be damaged. 00AC The fan motor is faulty.
X
At coolant temperatures below 248 ‡ (120 †), drive to the
nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-and-go traffic. Display messages
177On-board computer and displays Z
Page 183 of 290

Display messages Possible causes/consequences and
0050
0050Solutions Blind Spot Assist
Blind Spot Assist
Inoperative Inoperative Blind Spot Assist is defective.
The yellow
0063indicator lamps also light up in the exterior
mirrors.
X Visit a qualified specialist workshop. Blind Spot Assist Blind Spot Assist
Currently Currently
Unavailable See Unavailable See
Operator's Manual Operator's Manual Blind Spot Assist is temporarily inoperative if:
R
the sensors are dirty.
R its function is impaired due to heavy rain or snow.
R the radar sensor system is outside the operating temperature
range.
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.
The yellow 0063indicator lamps also light up in the exterior
mirrors.
Blind Spot Assist is operational again and the display message
disappears if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects that the sensors are fully available again.
R the radar sensor system is back within the operating
temperature range.
If the display message continues to be displayed:
X Clean the sensors (Y page 228).
X Restart the engine. Display
messages
181On-board computer and displays Z
Page 192 of 290

Warning and indicator lamps in the instrument cluster
Braking
Problem Possible causes/consequences and
0050
0050Solutions 0027
(USA
only)
004D
(Canada
only)
The red brake
system
warning lamp
comes on
while the
engine is
running. A
warning tone
also sounds. There is not enough brake fluid in the brake fluid reservoir.
G WARNING
The braking effect may be impaired.
There is a risk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 131).
X Do not add brake fluid. Adding more will not remedy the
malfunction.
X Consult a qualified specialist workshop.
X Observe the additional display messages in the multifunction
display. 0049
(USA
only)
0024
(Canada
only)
The indicator
lamp for the
electric
parking brake
flashes and/
or the yellow
warning lamp
for the
electric
parking brake
lights up. The electric parking brake is temporarily malfunctioning or
defective.
G WARNING
In this condition, the vehicle is only of limited roadworthiness. This
can lead to an accident.
X Observe the additional display messages in the multifunction
display. 190
Warning and indicator lamps in the instrument clusterOn-board computer and displays