2017 MERCEDES-BENZ CLA sensor

Display messages
Possible causes/consequences and P Solutions
Radar Sensor s Dirty
See Operator' s Man ‐
ual The radar sensor system is malfunctioning .
Possibl e causes are: R
Dirt on sensor sR
Heavy rain or snow R
Whe n drivin g on inter-urban roads without traffic or infrastructure,
e.g. in desert-like area s
At least on e drivin g system or drivin g safet y system is malfunctioning
or is temporarily unavailable :R
Active Brake Assis tR
Distanc e Pilo t DISTRONI C
A warning tone also sounds.
Once th e caus e of th e problem is no longer present, th e drivin g and
drive safet y systems will be available again . The display message dis-
appears.
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 140).X
Switc h off th e engine.X
Clean all sensor s ( Y
page 262).X
Restart th e engine.
The display message disappears.
u SRS Malfunction Ser ‐
vic e Required The restrain t system is malfunctioning . The u warning lamp also
lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.
Fo r further information about th e restrain t system, see ( Y
page 39) .
u Front Lef t Malfunc‐
tio n Servic e
Required or Front
Right Malfunction
Servic e Required The restrain t system is malfunctioning at th e fron t on th e lef t or right .
The u warning lamp also lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately. Display messages 19 5
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
I Check Front Lef t
Sidemarke r Lam p or
Check Front Right
Sidemarke r Lam p The fron t left-han d or fron t right-hand side marke r lamp is faulty.X
Visit a qualified specialist workshop .
I Check Rea r Lef t
Sidemarke r Lam p or
Check Rea r Right
Sidemarke r Lam p The rear left-han d or rear right-hand side marke r lamp is faulty.X
Visit a qualified specialist workshop .
I Check Lef t Daytim e
Runnin g Light or
Check Right Daytim e
Runnin g Light The lef t or right-hand daytime runnin g lamp is faulty.X
Chec k whether you are permitte d to replace th e bulb yourself
( Y
page 103).
or X
Visit a qualified specialist workshop .
I Active Headlamps
Inoperative The active ligh t function is faulty.X
Visit a qualified specialist workshop .
I Malfunction See
Operator' s Manual The exterio r lighting is malfunctioning .X
Visit a qualified specialist workshop .
I Aut o Lam p Function
Inoperative The ligh t sensor is defective. X
Visit a qualified specialist workshop .
I Switch Off Lights The lights are still switched on when you leav e th e vehicle. A warning
tone also sounds. X
Turn th e ligh t switch to th e X position .
I Switch On Headlamps You are drivin g wit h low-beam headlamp s switched off .X
Turn th e ligh t switch to th e X or X position .Display messages 20 1
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Blind Spo t Assist
Currently Unavaila‐
ble See Operator' s
Manual Blind Spot Assis t is temporarily inoperative.
Possibl e causes are: R
th e radar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti c radiation emitted by nearby TV or radi o station s or
other source s of electromagneti c radiationR
th e radar sensor system is outside th e operating temperature range
The yellow c indicator lamp s also ligh t up in th e exterio r mirrors.
Whe n th e causes state d abov e no longer apply, th e display message
disappears.
Blind Spot Assis t is operational again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 140).X
Restart th e engine.
Blind Spo t Assist
Inoperative Blind Spot Assis t is faulty.
The yellow c indicator lamp s also ligh t up in th e exterio r mirrors.X
Visit a qualified specialist workshop .
Parkin g Pilot Can ‐
celed The driver's door is open and th e driver's seat belt has no t been fas -
tened. X
Repeat th e parking process wit h th e seat belt fastene d and th e
driver's door closed .
You hav e inadvertentl y touched th e multifunction steering whee l while
steering intervention was active .X
Whil e steering intervention is active , mak e sur e that th e multifunc-
tion steering whee l is no t touched unintentionally.
The vehicl e has started to skid and ES P ®
has intervened.X
Use Parking Pilo t again later ( Y
page 162).
Parkin g Pilot Inop‐
erativ e You hav e jus t carrie d out a larg e number of turnin g or parking maneu-
vers.
Parking Pilo t will become available again after approximately te n
minute s ( Y
page 162). X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Switc h off and restar t th e engine.
If th e multifunction display still shows th e display message :X
Visit a qualified specialist workshop .
Parking Assis t PARKTRONI C is malfunctioning .X
Visit a qualified specialist workshop .206
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
Parkin g Pilot Fin ‐
ished The vehicl e is parked. A warning tone also sounds.
The display message disappear s automatically.
Distance Pilot Off Distanc e Pilo t DISTRONI C is deactivated ( Y
page 150).
If it was no t deactivated by th e driver , a warning tone also sounds.
Distance Pilot Now
Available Distanc e Pilo t DISTRONI C is operational again after having been tem-
porarily unavailable . You can no w reactivat e Distanc e Pilo t
DISTRONI C ( Y
page 150).
Distance Pilot Cur ‐
rently Unavailable
See Operator' s Man ‐
ual Distanc e Pilo t DISTRONI C is temporarily inoperative.
Possibl e causes are: R
th e radar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti c radiation emitted by nearby TV or radi o station s or
other source s of electromagneti c radiationR
th e system is outside th e operating temperature rangeR
th e on-boar d voltag e is to o low
A warning tone also sounds.
Whe n th e causes state d abov e no longer apply, th e display message
disappears.
Distanc e Pilo t DISTRONI C is operational again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 140).X
Restart th e engine.
Distance Pilot Inop‐
erativ e Distanc e Pilo t DISTRONI C is malfunctioning . Situation-dependen t
parking assistanc e may also hav e failed.
A warning tone also sounds. X
Visit a qualified specialist workshop .
Distance Pilot Sus ‐
pended You hav e depressed th e accelerato r pedal . Distanc e Pilo t DISTRONI C
is no longer controllin g th e speed of th e vehicle.X
Remove your foo t from th e accelerato r pedal .
Distance Pilot
- - - mph A condition for activating Distanc e Pilo t DISTRONI C has no t been met .X
Chec k th e activation condition s for Distanc e Pilo t DISTRONI C
( Y
page 150). Display messages 20 7
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Check Tires US A only:
The tire pressur e in on e or mor e tires has dropped significantly. The
whee l position appear s in th e multifunction display.
A warning tone also sounds.
G WARNIN G
Tir e pressures that are to o low pos e th e followin g hazards :R
they may burst, especially as th e load and vehicl e speed increas eR
they may wear excessivel y and/o r unevenly, whic h may greatl y
impair tire traction .R
th e drivin g characteristics , as well as steering and braking , may be
greatl y impaire d
There is a ris k of an accident.X
Stop th e vehicl e without making any sudden steering or braking
maneuvers . Pay attention to th e traffic condition s as you do so.X
Secur e th e vehicl e against rollin g away ( Y
page 140).X
Chec k th e tires and , if necessary, follow th e instruction s for a flat
tire ( Y
page 266). X
Chec k th e tire pressur e ( Y
page 289).X
If necessary, correc t th e tire pressure.
Warnin g Tir e Mal ‐
function US A only:
The tire pressur e in on e or mor e tires has dropped suddenly. The whee l
position appear s in th e multifunction display.
G WARNIN G
Drivin g wit h a flat tire poses a ris k of th e followin g hazards :R
a flat tire affects th e abilit y to steer or brak e th e vehicl eR
you could lose control of th e vehicl eR
continued drivin g wit h a flat tire will caus e excessive heat build-up
and possibl y a fir e
There is a ris k of an accident.X
Stop th e vehicl e without making any sudden steering or braking
maneuvers . Pay attention to th e traffic condition s as you do so.X
Secur e th e vehicl e against rollin g away ( Y
page 140).X
Chec k th e tires and , if necessary, follow th e instruction s for a flat
tire ( Y
page 266).
Tir e Press. Monito r
Currently Unavaila‐
ble US A only:
Becaus e there is interferenc e from a stron g source of radi o waves, no
signals from th e tire pressur e sensor s are detected. The tire pressur e
monitor is temporarily malfunctioning .X
Drive on .
The tire pressur e monitor restarts automatically as soo n as th e
problem has been resolved.210
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
TirePress . Sen ‐
sor(s) Missin g US A only:
There is no signal from th e tire pressur e sensor of on e or several
wheels. The pressur e of th e affecte d tire does no t appear in th e mul-
tifunction display. X
Hav e th e fault y tire pressur e sensor replace d at a qualified special -
ist workshop .
Tir e Pressure Moni‐
tor Inoperative No
Wheel Sensor s US A only:
The wheels mounte d do no t hav e a suitable tire pressur e sensor . The
tire pressur e monitor is deactivated. X
Moun t wheels wit h suitable tire pressur e sensors.
The tire pressur e monitor is activated automatically after drivin g for
a few minutes.
Tir e Press. Monito r
Inoperative US A only:
The tire pressur e monitor is faulty.X
Visit a qualified specialist workshop .
Vehicle Display messages
Possible causes/consequences and P Solutions
Depres s Brake to
Start Engine You hav e attempte d to start th e engin e wit h th e transmission in posi-
tion N without depressing th e brak e pedal .X
Depress th e brak e pedal .
To Deselect P or N,
Depres s Brake and
Start Engine You hav e attempte d to shift th e transmission to position R or D with-
out starting th e engine.X
Start th e engine. X
Depress th e brak e pedal .
i It is only possibl e to shift th e transmission from position P to th e
desire d position if you depress th e brak e pedal . Only then can th e
parking loc k be deactivated. If you do no t depress th e brak e pedal ,
th e DIRECT SELECT lever can still be moved but th e parking loc k
remain s engaged.
i At transmission fluid temperatures belo w

! Clean the water drainage channels of the
windshield and the rear window at regular
intervals. Deposits such as leaves, petals and
pollen may under certain circumstances pre-
vent water from draining away. This can lead
to corrosion damage and damage to elec-
tronic components. X
Clean the inside and outside of the windows
with a damp cloth and a cleaning product that
is recommended and approved by Mercedes-
Benz.
Cleaning wiper blades
G WARNING
You could become trapped by the windshield
wipers if they start moving while cleaning the
windshield or wiper blades. There is a risk of
injury.
Always switch off the windshield wipers and
the ignition before cleaning the windshield or
wiper blades.
! Only fold the windshield wipers away from
the windshield when vertical. Otherwise, you
will damage the hood.
! Do not pull the wiper blade. Otherwise, the
wiper blade could be damaged.
! Do not clean wiper blades too often and do
not rub them too hard. Otherwise, the graph-
ite coating could be damaged. This could
cause wiper noise.
! Hold the wiper arm securely when folding
back. The windshield could be damaged if the
wiper arm smacks against it suddenly. X
Fold the windshield wiper arms away from the
windshield. X
Carefully clean the wiper blades with a damp
cloth. X
Fold the windshield wiper arms back again
before switching on the ignition.
Cleaning the exterior lighting
! Only use cleaning agents or cleaning cloths
which are suitable for plastic light lenses.
Unsuitable cleaning agents or cleaning cloths
could scratch or damage the plastic light len-
ses. X
Clean the plastic lenses of the exterior lights
with a wet sponge and a mild cleaning agent,
e.g. Mercedes-Benz car shampoo or cleaning
cloths.
Cleaning the mirror turn signals
! Only use cleaning agents or cleaning cloths
that are suitable for plastic lenses. Unsuitable
cleaning agents or cleaning cloths could
scratch or damage the plastic lenses of the
mirror turn signals. X
Clean the plastic lenses of the mirror turn sig-
nals in the exterior mirror housing using a wet
sponge and mild cleaning agent, e.g.
Mercedes-Benz car shampoo or cleaning
cloths.
Cleaning the sensors
! If you clean the sensors with a power
washer, make sure that you keep a distance
of at least 11.8 in (30 cm) between the vehicle
and the power washer nozzle. Information
about the correct distance is available from
the equipment manufacturer.
X
Clean sensors C of the driving systems with
water, car shampoo and a soft cloth.
Cleaning the rear view camera
! Do not clean the camera lens and the area
around the rear view camera with a power
washer.262
Care
Maintenance and care

same time cannot be detected by the tire pres-
sure loss warning system.
The tire pressure monitor is not able to warn you
of a sudden loss of pressure, e.g. if the tire is
penetrated by a foreign object. In the event of a
sudden loss of pressure, bring the vehicle to a
halt by braking carefully. Avoid abrupt steering
movements.
The function of the tire pressure loss warning
system is limited or delayed if: R
snow chains are mounted on your vehicle's
tires. R
road conditions are wintry. R
you are driving on sand or gravel. R
you adopt a very sporty driving style (corner-
ing at high speeds or driving with high rates of
acceleration). R
you are driving with a heavy load (in the vehi-
cle or on the roof)
Restarting the tire pressure loss warn-
ing system Restart the tire pressure loss warning system if
you have: R
changed the tire pressure R
changed the wheels or tires R
mounted new wheels or tires X
Before restarting, make sure that the tire
pressures are set properly on all four tires for
the respective operating conditions.
The recommended tire pressure can be found
on the Tire and Loading Information placard
on the B-pillar. Additionally, a tire pressure
table is attached to the fuel filler flap. The tire
pressure loss warning system can only give
reliable warnings if you have set the correct
tire pressure. If an incorrect tire pressure is
set, these incorrect values will be monitored. X
Also observe the notes in the section on tire
pressures ( Y
page 285).X
Make sure that the SmartKey is in position 2
in the ignition lock ( Y
page 121).X
Press Y or e on the steering wheel to
select the Serv. menu.X
Press the c or d button to select
Tire Pressure .X
Press the v button.
The Run Flat Indicator Active Press
'OK' to Restart message appears in the
multifunction display. If you wish to confirm the restart: X
Press the v button.
The Tire Pressure Now OK? message
appears in the multifunction display. X
Press the c or d button to select Yes .X
Press the v button.
The Run Flat Indicator Restarted mes-
sage appears in the multifunction display.
After a teach-in period, the tire pressure loss
warning system will monitor the set tire pres-
sures of all four tires.
If you wish to cancel the restart: X
Press the 8 button.
or X
If the Tire Pressure Now OK? message
appears, press the c or d button to
select Cancel . X
Press the v button.
The tire pressure values stored at the last
restart will continue to be monitored.
Tire pressure monitor
General notes If a tire pressure monitor is installed, the vehi-
cle's wheels have sensors that monitor the tire
pressures in all four tires. The tire pressure mon-
itor warns you if the pressure drops in one or
more of the tires. The tire pressure monitor only
functions if the corresponding sensors are
installed in all wheels.
Information on tire pressures is displayed in the
multifunction display. After a few minutes of
driving, the current tire pressure of each tire is
shown in the Serv. menu of the multifunction
display, see illustration (example).
For information on the message display, refer to
the "Checking the tire pressure electronically"
section ( Y
page 291).Tire pressure 289
Wheels and tires Z