If an identification is not possible, please
contact the service center.2.Rectify the flat tire.
Use of tire sealant, e.g., the Mobility Sys‐
tem, may damage the TPM wheel elec‐
tronics. In this case, have the electronics
checked at the next opportunity and have
them replaced if necessary.
Run-flat tires
Maximum speed
You can continue driving with a damaged tire
at speeds up to 50 mph/80 km/h.
Continued driving with a flat tire
If continuing to drive with a damaged tire:
1.Avoid sudden braking and steering maneu‐
vers.2.Do not exceed a speed of 50 mph/80 km/h.3.Check the air pressure in all four tires at
the next opportunity.
If the tire inflation pressure in all four tires
is correct, it is possible that a reset was not
carried out for the Tire Pressure Monitor. In
that case, carry out a reset.
Possible driving distance with complete loss of
tire inflation pressure:
The possible driving distance after a loss of tire
inflation pressure depends on the cargo load
and the driving style and conditions.
For a vehicle containing an average load, the
possible driving distance is approx.
50 miles/80 km.
When the vehicle is driven with a damaged tire,
its handling characteristics change, e.g., re‐
duced lane stability during braking, a longer
braking distance, and altered self-steering
properties. Adjust your driving style accord‐
ingly. Avoid abrupt steering maneuvers or driv‐
ing over obstacles, e.g., curbs, potholes, etc.
Because the possible driving distance de‐
pends on how the vehicle is used during the
trip, the actual distance may be smaller or
greater depending on the driving speed, road
conditions, external temperature, cargo load,
etc.
Continued driving with a flat tire
Drive moderately and do not exceed a
speed of 50 mph/80 km/h.
A loss of tire inflation pressure results in a
change in the handling characteristics, e.g., re‐
duced lane stability during braking, a longer
braking distance and altered self-steering
properties.◀
Final tire failure
Vibrations or loud noises while driving
can indicate the final failure of the tire. Reduce
speed and stop; otherwise, pieces of the tire
could come loose and cause an accident. Do
not continue driving, and contact your service
center.◀
Required inflation pressure check
message
A Check Control message is displayed.
Check the tire inflation pressure and carry out
a reset of the system.
In some cases, a wheel was changed without
having carried out a reset.
System limits
The system does not function properly if a re‐
set has not been carried out, e.g., a flat tire is
reported even though the tire inflation pres‐
sures are correct.
The tire pressure depends on the temperature
of the tire. If the tire temperature rises, e.g.,
due to driving or because of the heat of the
Sun, the tire inflation pressure increases also.
The tire pressure is reduced when the tire
temperature falls again. This behavior may
cause a warning to be issued if temperatures
fall very sharply.Seite 99SafetyControls99
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MalfunctionThe yellow warning lamp flashes andthen lights up continuously. A Check
Control message is displayed. No flat
tire or loss of tire pressure can be detected.
Display in the following situations:▷A wheel without TPM electronics is fitted:
have the service center check it if neces‐
sary.▷Malfunction: have the system checked by
your service center.▷TPM was unable to complete the reset.
Reset the system again.▷Disturbance by systems or devices with
the same radio frequency: after leaving the
area of the disturbance, the system auto‐
matically becomes active again.
Declaration according to NHTSA/
FMVSS 138 Tire Pressure Monitoring
System
Each tire, including the spare (if provided)
should be checked monthly when cold and in‐
flated to the inflation pressure recommended
by the vehicle manufacturer on the vehicle
placard or tire inflation pressure label. (If your
vehicle has tires of a different size than the size
indicated on the vehicle placard or tire inflation
pressure label, you should determine the
proper tire inflation pressure for those tires.)
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pres‐
sure telltale when one or more of your tires is
significantly under-inflated. Accordingly, when
the low tire pressure telltale illuminates, you
should stop and check your tires as soon as
possible, and inflate them to the proper pres‐
sure. Driving on a significantly under-inflated
tire causes the tire to overheat and can lead to
tire failure. Under-inflation also reduces fuel ef‐
ficiency and tire tread life, and may affect the
vehicle's handling and stopping ability. Please
note that the TPMS is not a substitute for
proper tire maintenance, and it is the driver's
responsibility to maintain correct tire pressure,
even if under-inflation has not reached the
level to trigger illumination of the TPMS low
tire pressure telltale. Your vehicle has also
been equipped with a TPMS malfunction indi‐
cator to indicate when the system is not oper‐
ating properly. The TPMS malfunction indica‐
tor is combined with the low tire pressure
telltale. When the system detects a malfunc‐
tion, the telltale will flash for approximately one
minute and then remain continuously illumi‐
nated. This sequence will continue upon sub‐
sequent vehicle start-ups as long as the mal‐
function exists. When the malfunction indicator
is illuminated, the system may not be able to
detect or signal low tire pressure as intended.
TPMS malfunctions may occur for a variety of
reasons, including the installation of replace‐
ment or alternate tires or wheels on the vehicle
that prevent the TPMS from functioning prop‐
erly. Always check the TPMS malfunction tell‐
tale after replacing one or more tires or wheels
on your vehicle to ensure that the replacement
or alternate tires and wheels allow the TPMS
to continue to function properly.
FTM Flat Tire Monitor The conceptThe system does not measure the actual infla‐
tion pressure in the tires.
It detects a pressure loss in a tire by comparing
the rotational speeds of the individual wheels
while moving.
In the event of a pressure loss, the diameter
and therefore the rotational speed of the corre‐
sponding wheel change. This is detected and
reported as a flat tire.
Functional requirements
The system must have been initialized when
the tire inflation pressure was correct; other‐
wise, reliable signaling of a flat tire is not en‐Seite 100ControlsSafety100
Online Edition for Part no. 0140 2 909 827 - VI/13
PDC Park Distance Con‐trol 128
Pedestrian warning with city braking function 107
Permissible axle load 223
Personal Profile 33
Pinch protection system, glass sunroof 45
Pinch protection system, win‐ dows 44
Plastic, care 218
Power failure 207
Power sunroof, glass 45
Power windows 43
Pressure, tire air pres‐ sure 181
Pressure warning FTM, tires 100
Profile, refer to Personal Pro‐ file 33
Programmable memory but‐ tons, iDrive 22
Protective function, glass sunroof 45
Protective function, win‐ dows 44
Push-and-turn switch, refer to Controller 16, 17
R Radiator fluid 195
Radio-operated key, refer to Remote control 32
Radio ready state 62
Radio, see user's manual for Navigation, Entertainment
and Communication
Rain sensor 67
Rear lamps 204
Rear socket 154
Rearview mirror 54
Rear window de‐ froster 143, 146
Recirculated-air filter 147 Recirculated-air
mode 143, 146
Recommended tire brands 187
Refueling 178
Remaining range 79
Remote control/key 32
Remote control, malfunc‐ tion 36
Remote control, univer‐ sal 149
Replacement fuse 208
Replacing parts 198
Replacing wheels/tires 187
Reporting safety defects 9
RES button 123
Reserve warning, refer to Range 79
Reset, Tire Pressure Monitor TPM 98
Retaining straps, securing cargo 168
Retreaded tires 187
Roadside parking lamps 90
Roller sunblinds 44
RON gasoline quality 180
Roof load capacity 223
Roof-mounted luggage rack 168
Rope for tow-starting/ towing 214
RSC Run Flat System Com‐ ponent, refer to Run-flat
tires 188
Rubber components, care 218
Run-flat tires 188
S Safe braking 165
Safety 7
Safety belt reminder for driv‐ er's seat and front passen‐
ger seat 51
Safety belts 51 Safety belts, care 218
Safety Package, refer to Ac‐ tive Protection 112
Safety systems, airbags 94
Saving fuel 170
Screen, refer to Control Dis‐ play 16
Screwdriver 198
Screw thread for tow fit‐ ting 215
Seat and mirror memory 53
Seat belts, refer to Safety belts 51
Seat heating, front 50
Seating position for chil‐ dren 57
Seats 47
Selection list in instrument cluster 84
Selector lever, automatic transmission 70
Sensors, care 219
Service and warranty 7
Service history 81
Service requirements, Condi‐ tion Based Service
CBS 196
Service requirements, dis‐ play 80
Service, Roadside Assis‐ tance 211
Services, ConnectedDrive
Settings, locking/unlock‐ ing 41
Settings on Control Dis‐ play 86
Settings, storing for seat, mir‐ ror 53
Shifting, automatic transmis‐ sion 69
Shifting, manual transmis‐ sion 69
Shift paddles on steering wheel 71
Side airbags 94
Side View 133 Seite 232ReferenceEverything from A to Z232
Online Edition for Part no. 0140 2 909 827 - VI/13