Page 493 of 541
Ve
hicle Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
j Tr ailer hit chwarning lamp The
red trailer hitch warning lamp is on.
The trailer hitch is not operational or swivels. &
WARNING Risk of an accident if the ball neck is not loc ked
If th e ball neck is not in the loc ked position, the trailer may come loose. #
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. #
Uncouple the trailer and secure it against rolling away. #
Initiate a new swivelling procedure and do not re-couple the trailer until the display message disappears. #
Obser vethe messages in the multifunction displa y.
If th e trailer hitch swivels: #
Wait until the ball neck has reached the operational position. 490
Display messages and warning/indicator lamps
Page 495 of 541

Engine
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
; Engine diagnosis warning
lamp The
yellow engine diagnosis warning lamp is lit while the engine is running.
A malfunction has occu rred in the engine, theex haust sy stem or the fuel sy stem.
The emission limit values may be exceeded and the engine may be running in emergency operation mode. #
Have theve hicle checked as soon as possible at a qualified specialist workshop.
Ve hicles with a diesel engine: the fuel tank has been run dr y. #
Start the engine thre eto four times af terre fuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency operation mode is cancelled. The vehicle need not
be checked.
# Elect rical fault warning
lamp The
red elect rical fault warning lamp is lit.
There is a fault in the electrics. #
Obser vethe messages in the multifunction displa y.
8
Fu elreser vewarning lamp The
yellow fuel reser ve wa rning lamp is lit while the engine is running.
The fuel le vel has dropped into there ser verange. #
Refuel. 492
Displaymessa ges and warning/indicator lamps
Page 496 of 541

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
? Coolant warning lamp The
red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120 °C. &
WARNING Danger of bu rns when opening the bonn et
If yo u open the engine bonn etwhen the engine has overheated or during a fire inthe engine compartment, you
could come into contact wi thhot gases or other escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the engine bonn etclosed 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. Display messages and
warning/indicator lamps 493
Page 497 of 541
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
Otherwise: #
Lea vetheve hicle and keep a safe dis tance from theve hicle until the engine has cooled down. #
Check the coolant le vel . #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive on tothe nearest qualified specialist workshop. In doing so, ensure that the
coolant temp erature display remains below 120 °C. 494
Displaymessa ges and warning/indicator lamps
Page 498 of 541

Ty
res Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
h Ty re pressure monitoring
sy stem warning lamp lights
up The
yellow tyre pressure monitoring sy stem warning lamp (pressure loss/malfunction) is lit.
The tyre pressure monitoring sy stem has de tected tyre pressure loss in at least one of the tyres. &
WARNING Risk of an accident due toinsuf ficient tyre pressure
Ty res with insuf ficient tyre pressure pose thefo llowing risks:
R The tyres may bur st, especially as the load and vehicle speed increase.
R The tyres may wearexc essively and/or une venly, which may greatly impair tyre traction.
R ‑ The driving characteristics, steering and braking may be greatly impaired.
Yo u could then lose control of theve hicle. #
Obser vethere commended tyre pressures. #
Adjust the tyre pressure if necessar y. #
Stop theve hicle, paying attention toroad and traf fic conditions. #
Check the tyre pressure and the tyres. Display messages and
warning/indicator lamps 495
Page 499 of 541
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
h Ty re pressure monitoring
sy stem warning lamp
fl ashes The
yellow tyre pressure monitoring sy stem warning lamp (pressure loss/malfunction) flashes for appro ximately one
minute and then remains lit.
The tyre pressu remonitoring sy stem is faulty. &
WARNING Thereis a risk of an accident if the tyre pressure monitoring sy stem is malfunctioning
If th e tyre pressure monitoring sy stem is malfunctioning, it is not able toissue a warning if there is pressure loss in
one or more of the tyres.
Ty res with insuf ficient tyre pressure ma y,forex ample, af fect theve hicle's handling characteristics, steering and
braking. ‑ #
Have the tyre pressure monitoring sy stem checked at a qualified specialist workshop. #
Consult a qualified specialist workshop. 496
Display messages and warning/indicator lamps
Page 502 of 541

Anti-theft pr
otection ................................ .82
Ad ditional door lock .............................. 62
AT A (anti-theft alarm sy stem) ................82
Immobiliser ........................................... 82
Interior pr otection ................................. 83
St opping the alarm (A TA) .......................82
To w- aw ay protection ............................. 83
Anticipatory occupant pr otection ......41, 42
Apple CarPlay™ .......................................3 10
Connecting an iPhone ®
........................ 311
Ending .................................................. 311
Overview ..............................................3 10
To ne settings ........................................ 311
Tr ans ferred vehicle data ....................... 313
Asht ray
Fr ont centre console ........................... 108
Re ar .................................................... .108
Assistance graphic
Menu (on-boa rdcompu ter) .................. 238
Assistance sy stems
see Driving saf ety sy stem
ASS YST PLUS ........................................... 352
Battery disconnection pe riods .............3 53
Displ aying the service due date ........... 352 Fu
nction/no tes ................................... 352
Re gular service work ........................... 352
Special service requirements .............. 352
ATA (anti-theft ala rmsystem)
Fu nction ................................................ 82
St opping the alarm ................................ 82
ATA (anti-theft ala rmsystem)
see Anti- theft pr otection
AT TENTION ASSI ST.......................... 218, 219
Ac tivating/deactivating ...................... .219
Fu nction ............................................... 218
Sy stem limitations ...............................2 18
At tention assistant
see ATTENTION ASSIST
Au dio mode
Ac tivating media mode ........................ 328
Connecting USB devices ..................... 330
Co pyright ............................................. 328
Information .......................................... 327
Inserting/re moving an SD card .......... .328
Media sea rch ....................................... 333
Overview ............................................. 329
Pa use and playback function .............. .330
Selecting a track ................................. 330 Selecting playba
ckoptions .................. 330
Tr ack list .............................................. 330
Au thorised workshop
see Qualified specialist workshop
Au tomatic distance control
see Dis tance Pilot DISTRONIC
Au tomatic driving lights ..........................11 5
Au tomatic engine start (ECO start/
sto p function) .......................................... 14 6
Au tomatic engine stop (ECO start/
sto p function) .......................................... 14 6
Au tomatic front passen ger airbag
shu toff
see Front passenger airbag shutoff
Au tomatic mir rorfo lding function
Ac tivating/deactivating ...................... .127
Au tomatic transmission
DIRECT SELECT le ver ........................... 15 0
Drive program display .......................... 14 8
Drive programs .................................... 14 8
DY NA MIC SELECT switch .................... 14 8
Engaging drive position ....................... 15 2
Engaging reve rsege ar ........................ .152 Index
499
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Kickdown .............................................
15 3
Manual gearshifting ............................ .153
Selecting park position ........................ 15 2
Shifting toneutral ................................ 15 2
St eering wheel gearshift paddles ........ 15 3
Tr ansmission position display .............. 15 0
Tr ansmission positions ........................ 15 0
Au tomatic transmission
see Selector le ver
Axle load Perm issible .......................................... 41 0
Tr ailer operation .................................. 422 B
Bag hook .................................................. 104
Ball ne ck
Fo lding in/out .................................... .228
BA S (Brake Assist Sy stem) .................... .170
Battery Key ........................................................ 60
Re mo tecontrol (s tationary heater) ...... 137
Battery (vehicle) Charging .............................................. 377No
tes ................................................... 375
St arting assis tance .............................. 377
Battery (vehicle) see Vehicle battery
Belt .............................................................29
Bic ycle rack
Tr ailer operation .................................. 231
Blind Spot Assist .................................... .222
Ac tivating/deactivating ...................... .224
Fu nction/no tes ................................... 222
Sy stem limits ....................................... 222
Blind Spot Assist see Active Blind Spot Assi st
Blo wer
see Climate control
BlueTEC see AdBlue ®
Blue tooth ®
Ac tivating/deactivating ...................... .267
Setting up an Internet connection ....... 320
Settings ............................................... 267 Switching profile (DUN/PAN) .............. 321 Blue
tooth ®
Au dio
Ac tivating ............................................ 338
De-authorising (de-regis tering) the
device .................................................. 338
Information .......................................... 335
Overview .............................................3 36
Sear ching for and auth orisingthe
device .................................................. 337
Switching device via NFC .................... 338
Boot lid .......................................................67
Ac tivating/deactivating the boot lid
opening limiter ...................................... 72
Closing .................................................. 68 HANDS-FREE ACCESS .......................... .70
Loc ked separately .................................72
Opening .................................................67
Opening dimensions ............................4 19
Boot lid see Boot lid
see Locking/unlocking
Brake Assi stSystem
see BAS (Brake Assi stSystem)
Brake fluid Notes ................................................... 41 8500
Index