engine MERCEDES-BENZ S-CLASS SALOON LONG 2020 Owners Manual

Display messages
Possible causes/consequences and M
MSolutions
Á Key not detected (red dis‐
play message) *T
hekey cannot be de tected and may no longer be in theve hicle.
The key is no lon ger in theve hicle and you swit choff the engine:
R You can no lon gerst art the engine.
R You cannot centrally lock theve hicle. #
Ensure that theke y is in theve hicle.
If th eke y de tection function has a malfunction due toast ro ng radio signal source: #
Stop theve hicle immediately in accordance with the traf fic conditions. #
Place theke y in the slot forst arting the engine with theke y (/ page189).
Place the key in the
marked space See Owner's
Manual *K
eydetection is malfunctioning. #
Change the location of theke y in theve hicle. #
Place theke y in the slot forst arting the engine with theke y (/ page189). Displ
aymessa ges and warning/indicator lamps 497

Display messages
Possible causes/consequences and M
MSolutions #
Consult a qualified specialist workshop.
Check dipped-beam set-
ting (left/right-side traffic) *T
he type of traf fic has been selected manual ly. #
Check the setting and change it manually if necessary (/ page161).
Dipped-beam setting (left/
right-side traffic) Manual
adjustment only *T
he automatic headlamp conversion for left-hand/right-hand traf fic has malfunctioned. #
Change the headlamps over manually (/ page161).
Adaptive Highbeam Assist
Plus currently unavailable
See Owner's Manual *A
daptive Highbeam Assist Plus is temp orarily una vailable.
Once the cause of the problem is no longer present, the sy stem will be available again. The Adaptive Highbeam
Assist Plus available again display message will appear. #
Drive on. #
Operate the high beam manually until Adaptive High Beam Assist Plus is available again.
Adaptive Highbeam Assist
Plus inoperative *A
daptive Highbeam Assist Plus is malfunctioning. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine. #
Ifth e display message still appears, consult a qualified specialist workshop.
Hazard warning lamp sys-
tem Malfunction *T
he hazard warning lamp switch is malfunctioning. #
Consult a qualified specialist workshop. 500
Display messages and warning/indicator lamps

Climate control
Displ
aymessages
Possible causes/consequences and M
MSolutions
& inoperative See Owner's
Man. *T
hestationary heater is temp orarily malfunctioning. #
When theve hicle is stationary on a le vel sur face and the engine has cooled down, make up tofour attem ptsto
switch on thest ationary heater, waiting se veral minutes between each attem pt. #
Ifth est ationary heater does not swit chon, consult a qualified specialist workshop.
% The stationary heater cannot be activated if the outside temp erature is abo ve15°C.
& inoperative Battery low *T
he on-board electrical sy stem voltage is too lo w.
The stationary heater has swit ched itself off. #
Drive an extended di stance until the battery has reached a suf ficient charge leve l again.
&
Inoperative Refuel vehicle *T
here is too little fuel in the fuel tank. The stationary heater cannot be swit ched on. #
Refuel theve hicle. Display messages and
warning/indicator lamps 501

Ve
hicle Display messages
Possible causes/consequences and M
MSolutions *T
he driver display is inoperative due toafa iled software update.
The display message is shown everytime the engine is star ted. &
WARNING Risk of accident due toa driver display malfunction
If th e driver display has failed or malfunctioned, the function restrictions applying tosaf etyre leva nt sy stems are
not visible.
The operating saf ety of your vehicle may be impaired. #
Drive on carefull y. #
Have theve hicle checked immediately at a qualified specialist workshop. If
th e operating saf ety of your vehicle is impaired, park theve hicle immediately and safely. Contact a qualified spe‐
cialist workshop.
If th e driver display fails, you may not recognise function restrictions af fecting sy stems releva nt tosaf ety or the
speed displa y,forex ample. The operating saf ety of theve hicle may be impaired (/ page312). #
Have theve hicle checkedby aqu alified specialist workshop immediatel y.502
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
Ù Steering malfunction Stop
immediately See Owner's
Manual *T
hesteering is malfunctioning. Steering capability is significant lyimpaired. &
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. Ù
Rear axle steering cur-
rently malfunctioning *T
herear axle steering is temp orarily una vailable. The turning circle may become wider. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine.
If th e display message does not disappear: #
Drive on carefull y. #
Consult a qualified specialist workshop.
Ù Rear axle steering Malfunc-
tion Visit workshop *T
herear axle steering is malfunctioning.
The rear axle has no steering capability.
The steering wheel may be tilted when you drive in a stra ight line. #
Adapt your speed and drive on carefull y. #
Consult a qualified specialist workshop immediatel y.506
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
C *A
t least one door is open. #
Close all doors.
M *T
he bonnet is open. &
WARNING Risk of accident due todriving with the bonn etunlo cked
The bonn etmay open and block your vie w. #
Neverre lease the bonn etwhen driving. #
Before every trip, ensure that the engine bonn etis loc ked. #
Stop theve hicle immediately, paying attention toroad and traf fic conditions. #
Close the bonn et.
N *T
he boot lid is open. &
DANG ER Risk of exhaust gas poisoning
Combustion engines emit poisonous exhaust gases such as carbon monoxide. Exhaust gases can enter the
ve hicle interior if the boot lid is open when the engine is running, especially if theve hicle is in motion. #
Alw ays switch off the engine before opening the boot lid. #
Never drive with the boot lid open. 508
Display messages and warning/indicator lamps

Engine
Display messages
Possible causes/consequences and M
MSolutions
To switch off the engine,
press the Start/Stop but-
ton for at least 3 seconds
or 3 times. *Y
ou ha vepressed thest art/ stop button while theve hicle is in motion. #
Information about switching off the engine while driving (/ page189).
+
Top up coolant See Own-
er’s Manual *T
he coolant le vel is too lo w.
* NO
TEEngine dama gedue toinsuf ficient coolant #
Avoid long journe yswith insuf ficient coolant. #
Add coolant (/ page 352). #
Have the engine cooling sy stem checked at a qualified specialist workshop.
ÿ
Coolant Stop vehicle
Switch engine off *T
he coolant is too hot. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. 51 0
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions &
WARNING Risk of bu rns when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
R You could come into contact with other hot, escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the bonn etclosed and call thefire service. #
Wait until the engine has cooled down. #
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
th e coolant temp erature display remains below 120°C.
ÿ *T
hefan mo tor is defective. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C. Displ
aymessa ges and warning/indicator lamps 511

Display messages
Possible causes/consequences and M
MSolutions
8 Reserve fuel level *T
he fuel supply has dropped into there ser verange. #
Refuel.
!
Clean the fuel filter *
Ve hicles with diesel engines: the fuel filter is dirty or thewate r inthe fuel filter needs tobe drained. #
Consult a qualified specialist workshop.
ý Replace air cleaner *
Ve hicles with diesel engines: the engine air filter is dirty and must be replaced. #
Consult a qualified specialist workshop. Tr
ansmission Display messages
Possible causes/consequences and M
MSolutions
Only select P when vehicle
is stationary *
It is possible toselect the park position jonly if theve hicle is stationar y. #
Tostop, depress the brake pedal. 512
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Shift the transmission topark position jwhen theve hicle is stationar y.
Apply brake to deselect P
position *
Yo u ha veattem ptedto shift the transmission out of park position jand into ano ther transmission position. #
Depress the brake pedal. #
Select transmission position h,kor neutral i.
Apply brake and start
engine to shift out of P or N *
Yo u ha veattem ptedto shift the transmission out of park position jor neutral iand into ano ther transmission
position. #
Depress the brake pedal. #
Start the engine. #
Change the transmission position.
Apply brake to engage D or
R *
You ha veattem ptedto select transmission position hork. #
Depress the brake pedal. #
Select transmission position hork.
Apply brake to engage R *
You ha veattem ptedto select transmission position k. #
Depress the brake pedal. #
Select transmission position k.
Apply parking brake to
park Visit workshop *
A malfunction has occur red in the emer gency po wer supp lyto park position j. #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 513