
Warning/indicator lamp
Possible causes/consequences and MSolutions
$
Brakewarning lamp (USA)
J
Brakes warning lamp (Can‐
ada) The
red brake sy stem warning lamp is lit while the engine is running.
Po ssible causes are:
RThe brake forc e boosting is malfunctioning and the braking characteristics may be af fected.
RThere is not enough brake fluid inthe brake fluid reser voir.
&
WARNING Thereis arisk of an accident if brake forc e boosting is malfunctioning
If brake forc e boosting is malfunctioning, the wheels may lock when braking. Braking characteristics may be
impaired. The braking dis tance in an eme rgency braking situation can increase.
#Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances.
#Consult a qualified specialist workshop.
&
WARNING Risk of an accident due tolow brake fluid le vel
If th e brake fluid leve l is too lo w,the braking ef fect and the braking characteristics may be impaired.
#Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances.
#Consult a qualified specialist workshop.
Do not add brake fluid.
452
Display messages and warning/indicator lamps

Warning/indicator lamp
Possible causes/consequences and MSolutions
!
ABSwarning lamp The
yellow ABS warning lamp is lit while the engine is running.
ABS is malfunctioning.
If th ere is an additional warning tone, EBD is malfunctioning.
Other driving and driving safe ty systems may also be faulty.
&
WARNING Thereisrisk of skidding if EBD or ABS is malfunctioning
If EBD or ABS is malfunctioning, the wheels could lock when braking
The steering capability and braking characteristics are thus se verely impaired .Th ebr aking dis tance in an emer‐
ge ncy braking situation can increase. In addition, other driving saf etysy stems are switched off.
#Drive on carefull y.
#Have the brake sy stem checked immediately at a qualified specialist workshop.
#Drive on carefully.
#Obser vethe messages in the multifunction displa y.
#Visit a qualified specialist workshop.
÷
ESP®wa rning lamp flashes The
yellow ESP
®wa rning lamp flashes while theve hicle is in motion.
ESP
®is inter vening.
#Ad apt your drivin gst yle to suit thero ad and weather conditions.
454
Display messages and warning/indicator lamps

Vehicle
Wa rning/indicator lamp
Possible causes/consequences and MSolutions
Ð
Powe rst eering sy stem
wa rning lamp The
red po werst eering sy stem warning lamp is lit while the engine is running.
The po werst eering assis tance or thesteering itself is malfunctioning.&
WARNING Risk of accident if steering capability is impaired
If th esteering does not function as intended, theve hicle's operating saf etyis jeopardized.
#Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances.
#Consult a qualified specialist workshop.
#Obser vethe messages in the multifunction displa y.
Displaymessage s andwarning/indicator lamps 461

Warning/indicator lamp
Possible causes/consequences and MSolutions
?
Coolantwarning lamp The
red coolant warning lamp is lit while the engine is running.
Po ssible causes are:RThe temp erature sensor is malfunctioning
RCoolant le velto o low
RThe air supply tothera diator is obstructed
RThe radiator fan is de fective
If th ere is an additional warning tone, the coolant temp erature has exceeded the maximum permissible temp erature.
&
WARNING Danger of burn s when opening the hood
If yo u open the hood when the engine has overheated or during a fire inthe engine compartment, you could come
into contact with hot gases or other escaping operating fluids.
#Before opening the hood, allow the engine tocool down.
#Intheeve nt of a fire inthe engine compartment, keep the hood closed and call thefire service.
#Stop theve hicle immediately, paying attention toroad and traf fic conditions, and switch off the engine. Do not con‐
tinue driving under any circums tances.
#Obser vethe messages in the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale:
#Consult a qualified specialist workshop.
464
Display messages and warning/indicator lamps

Tire s
Wa rning/indicator lamp
Possible causes/consequences and MSolutions
h
Tire pressure monitoring
sy stem warning lamp lights
up The
yellow tire pressure monitoring sy stem warning lamp (pressure loss/malfunction) is lit.
The tire pressure monitoring sy stem has de tected tire pressure loss in at least one of the tires.&
WARNING Risk of an accident due toinsuf ficient tire pressure
Ti re pressures that are too low pose thefo llowing hazards:
RThe tires may bur st, especially as the load and vehicle speed increase.
RThe tires may wearexc essively and/or une venly, which may greatly impair tire traction.
RThe driving characteristics, as well as steering and braking, may be greatly impaired.
Yo u could then lose control of theve hicle.
#Obser vethere commended tire pressure.
#Ad just the tire pressure if necessar y.
#Stop theve hicle, paying attention toroad and traf fic conditions.
#Check the tire pressure and the tires.
466
Display messages and warning/indicator lamps

Active Lane Change Assi st.................. 184
Fu nction .............................................. 183
Sy stem limitations .............................. .183
Ad aptive cruise control
see Active Dis tance Assist DISTRONIC
Ad aptive Highbeam Assist
Fu nction .............................................. 126
Switching on/off ................................. 127
Ad ditive s.................................................. 396
Engine oil ............................................ 396
Fu el ..................................................... 396
Ad ditive s (engine oil)
see Additives
Ad ditive s (fuel)
see Fuel
Ad dress book
see Contacts
Ad justing the balance/ fader
Burmes ter
®sur round sound sy stem ... 325
Ad justing the sound focus
Burmes ter
®sur round sound sy stem ... 325
ADS PLUS damping sy stem
see AIR BODY CONTROL Af
ter-sales service center
see ASS YST PLUS
Air bag Activation .............................................. 32
Pr otection ............................................. .38
Re duced pr otection .............................. .40
AIR BODY CONT ROL................................ 187
Setting ................................................. 189
Suspension .......................................... 187
Air conditioning sy stem
see Climate control
Air distribution ........................................ 136
Air freshener sy stem
see Frag rance sy stem
Air pressure see Tire
pressure
Air susp
ension
see AIR BODY CONTROL
Air vents ................................................... 141
Ad justing (front) ................................... 141
Ad justing (rear passenger compart‐
ment) ................................................... 142
Glo vebox ............................................ .142 Air-recirculation mode
............................139
Airb ag........................................................ .38
Fr ont airbag (driver, front passenger) ....3 8
Ins tallation locations ............................ .38
Knee airbag ........................................... 38
Overview ............................................... 38
Side airbag ............................................ 38
Wi ndow airbag ....................................... 38
Ai rflow ...................................................... 136
AIRP ANEL (Care) ...................................... 336
Alarm see Panic alarm
Alarm sy stem
see ATA (anti-theft alarm sy stem)
Alternative route
see Route
Ambient lighting ...................................... 128
Android Auto ............................................ 292
Connecting a mobile phone ................. 293
Ending ................................................. 294
No tes .................................................. 293
Overview ....................................... ...... 292
Sound settings .................................... 294
Index 469

Air Conditioning Malfunction See
Operator's Manual .............................. 442
App lyBrake toShift from 'P' ...............440
ÀAT TENTION ASSIST Inoperative ... 420
ÀAT TENTION ASSIS T:Take a
Break! .................................................. 420
bAu toLamp Function Inoperati ve
............................................................. 448
Au xilia ryBattery Malfunction ..............442
Blind Spot Assist Currently Una vaila‐
ble See Opera tor's Manual .................. 424
Blind Spot Assist Inoperative ............... 426
Blind Spot Assist Not Available When
To wing a Trailer See Operator's Man‐
ual ...................................................... .425
$Che ckBrake Fluid Le vel.............. .412
Check Coolant Le vel See Operator's
Manual ................................................ 430
4Check Engine Oil AtNext Refu‐
eling .................................................... 434 bChe
ckLeft Low Beam (e xam‐
ple) ...................................................... 447
hCheck Tire s ................................. 435
¥Check Washer Fluid .................... 446
ÁCom pressor Is Coolin g................ 422
?Coolant Too Hot Stop Vehicle
Tu rn Engine Off .................................... 431
Cruise Control Canceled ..................... 430
Cruise Control Inoperati ve.................. 430
!Cur rently Una vailable See Oper‐
ator's Manual ........
...
........................... 404
÷Cur rently Una vailable See Oper‐
ator's Manual ...................................... 405
ÂDon't Forget Your Key................ .439
ÁDrive More Slowly ....................... 422
Driver's Door Open & Transmission
No t in P Risk of Vehicle Rolling Away ..440
6Fr ont Left Malfunction Service
Re quired (e xamp le) .............................. 417 Fr
ont Passenger Airbag Disabled See
Operator's Manual ...............................4 18
Fr ont Passenger Airbag Enabled See
Operator's Manual ...............................4 19
8Fu el Level Low ............................ 434
8Gas Cap Loose ............................ 434
!Inoperative See Opera tor's
Manual ................................................4 03
÷Inopera tive See Operator's
Manual ................................................ 406
TInope rative See Operator's
Manual ................................................ 407
GInope rative ................................... 412
ÂKe yNo tDe tected (red displ ay
message )............................................ .439
ÂKe yNo tDe tected (white dis‐
play message ).................................... .439
6Left Side Cu rtain Airbag Mal‐
function Ser vice
R
e quired (e xample)..417
Index 47
7

Let fresh air intotheve hicle interior.
Air Conditioning Malf. Visit Wo rk‐
shop ....................................................4 43
É Lowe ring .................................... 420
Malfunction Drive at Max. 50 mph
...................................................... 422, 426
bMalfunction See Operator ’s
Manual ................................................ 448
N Pe rm anently Active Risk of Rolling
Aw ay .................................................... 441
ÂObtain a New Key........................ 43 8
ëOf f.............................................. .428
Only Shift to'P' when Vehicle is Sta‐
tionary ................................................ .441
FPa rking Brake See Opera tor's
Manual ................................................ 409
ÂPlace theKe yin the Mar ked
Space See Opera tor's Manual .............440
hPlease Cor rect Tire Pressure .......435
FPlease Release Parking Brake .....4 08 PRE-SAFE Impulse Side Inoperative
See Operator's Manual
........................414
PRE-SAFE Inoperative See Opera‐
to r's Manual ......................................... 414
Ra dar Sensors Dirty See Operator's
Manual .........................................4 13,41 5
_Re ar Left Backrest Not
Latc hed (e xample)........
...
................... .446
ÂRe placeKeyBat tery .................... 438
Re versing Not Possible Service
Re quired .............................................. 442
#See Opera tor's Manual ............... 432
Service Required Do Not Shift Gears
Vi sit Dealer .......................................... 441
6SRS Malfunction Service
Re quired .............................................. 416
#St art Engine See Operator's
Manual ................................................ 433
ÐSt eering Malfunction Drive
Carefully Service Required .................. 443 ÐSt
eering Malfunction Inc reased
Ph ysical Ef fort See Opera tor's Man‐
ual ....................................................... 444
ÐSt eering Malfunction Stop
Immediately See Operator's Manual ...444
St op Vehicle Lea veEngine Running
Wa itTransmission Cooling ..................442
#St opVehicle Lea veEngine Run‐
ning ..................................................... 433
#St opVehicle See Operator's
Manual ................................................ 433
ÁSt opVehicle Vehicle Too Low ...... 421
bSwitch Off Lights .........................448
bSwitch On Headlamp s................. 448
Ti re Press. Monitor Cur rently
Un available ...............
........................... 436
Ti re Press. Monitor Inoperative ............ 437
Ti re Pressure Monitor Inoperative No
Wheel Sensors .................................... 437
Ti re s Overheated ................................. 437
478
Index