2018 MERCEDES-BENZ CLS COUPE warning

Ve
hicle Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ï Tr ailer tow hit chwarning
lamp The
red trailer tow hit chwarning lamp is on.
The trailer tow hit chis 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 on the multifunction displa y.
If th e trailer hitch swivels: #
Wait until the ball coupling has reached the operational position. 534
Display messages and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
Ð Po we 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 ety is jeopardised. #
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 on the multifunction displa y. Displ
aymessa ges and warning/indicator lamps 535

Engine
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
; Engine diagnosis warning
lamp The
yellow engine diagno stics 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 emissions limit value may ha vebeen exceeded and the engine may be running in eme rgency operation mode. #
Have theve hicle checked as soon as possible at a qualified specialist workshop.
Ve hicles with a diesel engine: the fuel tank may ha vebeen run dr y. #
Start the engine thre eto four times af terre fuelling.
If th eye llow engine diagno stics 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 supply has dropped into there ser verange. #
Refuel. 536
Displaymessa ges and warning/indicator lamps

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. #
Obser vethe messages on 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 537

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
or #
exitth eve hicle and keep a safe dis tance from it until the engine has cooled down #
Check the coolant le vel (→ page 393). #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that the
coolant temp erature display remains below 120 °C. 538
Displaymessa ges and warning/indicator lamps

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 539

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. 540
Displaymessa ges and warning/indicator lamps

H
Handbrake see Electric parking brake
Handling characteristics (unusual) ....... 428
HANDS-FREE ACCESS ................................ 79
Haza rdwa rning lights ............................ .125
HD prog rammes
see CI+ module
Head restra int
Fr ont (adjusting mechanically) .............. 96
Fr ont (luxury head restra int) .................. 97
Re ar (adjusting) .................................... .98
Head-up display ....................................... 264
Ad justing display elements (on-board
compu ter) ............................................ 264
Ad justing the brightness (on-board
computer) ............................................ 264
Fu nction .............................................. 265
Menu (on-board compu ter) .................. 264
Operating the memory function ..........1 04
Setting the position (on-board com‐
puter) .................................................. 264
Switching on/off ................................. 266 Headla
mpflasher ................................... .124
Heating see Climate control
High beam Switching on/off ................................. 124
High-pressure cleaner (care) ................. 396
Hill Start Assist ....................................... 208
HOLD function ......................................... 208
Fu nction/no tes ................................... 208
Switching on/off ................................. 208
Hooking the luggage net .........................112
Hotspot Setting up (Wi-Fi) ................................. 293 I
i-Size child seat securing sy stem ............ 50
Fitting .................................................... 51
No tes ..................................................... 50
Seats suitable for attaching ................... 61
Identification pla te
Engine ................................................. 450
Ve hicle ................................................ 450 Ignition
Switching on (S tart/S top button) ........ 14 9
Ignition key
see Key
Immobiliser ................................................ 89
Implied warranty
Ve hicle .................................................. 28
In Car Of fice
Calling up ............................................ 340
Fe atures .............................................. 339
Marking a to-do entry as compl eted ....3 40
Noting an incoming call ....................... 340
Selecting functions .............................. 340
Switching auto maticstart on/off ........ 340
Indicator lamps see Warning/indicator lamps
Individual drive prog ram
Con figuring .......................................... 16 0
Selecting ............................................. 16 0
Instrument clus ter
see Instrument display
Instrument display ..................................2 53
Ad justing the lighting .......................... 258 Index
559