2018 MERCEDES-BENZ S-CLASS CABRIOLET air condition

Displaymessages
Possible causes/consequences and MSolutions
Malfunction Drive at Max.
50 mph*T
he AIR BODY CONTROL function is restricted. The vehicle's handling characteristics may be af fected.
* NO
TEThe tires of the front axle or the front fende rscould be damaged bylarge steering mo vements#Av oid large steering mo vements while driving and lis tenfo r scraping sounds.
#If yo u hear scra ping sounds, pull over and stop theve hicle safely, paying attention toroad and traf fic con‐
ditions, and set a higher vehicle le vel if possible.
#Do not drive fasterthan 50 mph (80 km/h).
#Visit a qualified specialist workshop.
Active Lane Keeping Assist
Currently Unavailable See
Operator's Manual *A
ctive Lane Keeping Assist is temp orarily una vailable.
The ambient conditions are outside the sy stem limitations (
→page 205).
Ve hicles with Active Steering Assis t:The camera view may be restricted bythe windshield.
#Drive on.
As soon as the ambient conditions are within the sy stem limitations, the sy stem will become available again.
If th e display message does not disappear on vehicles with Active Steering Assis t:
#Pullover and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions.
#Clean the windshield.
Active Lane Keeping Assist
Inoperative *A
ctive Lane Keeping Assist is malfunctioning.
#Visit a qualified specialist workshop.
422
Display messages and warning/indicator lamps

Engine
Display messagesPossible causes/consequences and MSolutions
Check Coolant Level See
Operator's Manual *T
he coolant le vel is too lo w.
* NO
TEEngine damage duetoinsuf ficient coolant
#Av oid long journe yswith insuf ficient coolant.
#Ad d coolant .
?
Coolant Too Hot Stop Vehi-
cle Turn Engine Off *T
he coolant is too hot.
#Pull over and stop theve hicle safely and switch off the engine, paying attention toroad and traf fic conditions.
&
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.
#Wa it until the engine has cooled down.
#Make sure that the air supply tothera diator is not obstructed.
#Av oiding high loads on the engine, drive on tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 248 °F (120 °C).
Display message s andwarning/indicator lamps 427

Displaymessages
Possible causes/consequences and MSolutions
h
Check Tires*T
he tire pressure in one or more tires has dropped significantl y.The wheel position is displa yed.
&
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.
Display messages and warning/indicator lamps 431

Displaymessages
Possible causes/consequences and MSolutions
h
Warning Tire Malfunction*T
he tire pressure in one or more tires has dropped suddenly. The wheel position is displa yed.
&
WARNING Risk of an accident from driving wi thaflat tire
Flat tires are dangerous in thefo llowing ways:
RThe tires can overheat and cause a fire .
RThe driving characteristics, as well as steering and braking, may be greatly impaired.
Yo u could then lose control of theve hicle.
#Do not drive with a flat tire.
#Observ eth e no tes on flat tires.
No tes on flat tires (→page 342).
#St op theve hicle, paying attention toroad and traf fic conditions.
#Check the tires.
Tire Press. Monitor Cur-
rently Unavailable *N
o signals can be receive d from the tire pressure sensors due tostro ngradio signal source inter fere nce. The tire
pressure monito ring sy stem is temp orarily una vailable.
#Drive on.
The tire pressure monitoring sy stem restarts automatically as soon as the cause has been rectified.
432
Display messages and warning/indicator lamps

Displaymessages
Possible causes/consequences and MSolutions
Stop Vehicle Leave Engine
Running Wait Transmission
Cooling *T
he transmission has overheated. Pulling away can be temp orarily impaired or not possible.
#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.
#Lea veengine running.
#Wa it until the display message disappears before pulling away.
Auxiliary Battery Malfunc-
tion *T
he auxiliary batteryforth e transmission is no longer being charge d.
#Visit a qualified specialist workshop.
#Un tilthen, alw ays manually set the transmission toposition jbefore youswit choff the engine.
#Before leaving theve hicle, apply the electric parking brake.
Air Conditioning Malfunc-
tion See Operator's Manual *O
peration of the climate control sy stem is temp orarily restricted. Air flow and fresh air supply are set toautomatic
mode.
#Ha ve the climate control sy stem checked at a qualified specialist workshop.
438
Display messages and warning/indicator lamps

Displaymessages
Possible causes/consequences and MSolutions
Let fresh air into the vehi-
cle interior. Air Condition-
ing Malf. Visit Workshop *T
he climate contro l system is malfunctioning.
&
WARNING Risk of injury and accident due toan insuf ficient supply of fresh air
If th e climate control sy stem is malfunctioning, carbon dioxide le vels may inc rease in theve hicle interior.
Breathing in carbon dioxide may cause dizziness.
#Open the window toensure that there is a suf ficient supply of fresh ai r.
#Openthe window toensure that there is an adequate supply of fresh air.
#Visit a qualified specialist workshop immediatel y.
Ð
Steering Malfunction Drive
Carefully Service Required *T
he po wer assi stance of thesteering is malfunctioning. You may need touse more forc eto steer.
#Drive on carefull y.
#Visit a qualified specialist workshop.
Display messages and warning/indicator lamps 439

Displaymessages
Possible causes/consequences and MSolutions
Ð
Steering Malfunction Stop
Immediately See Opera-
tor's Manual*T
hesteering is malfunctioning. Steering capability is considerably impaired.
&
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.
#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.
Ð
Steering Malfunction
Increased Physical Effort
See Operator's Manual *T
he po wer assi stance of thesteering is malfunctioning.
&
WARNING Risk of an accident due toaltered steering characteristics
If th e po wer assi stance of thesteering fails partially or comple tely,yo uwill need touse more forc eto steer.
#If safe steering is possible, drive on carefully.
#Vi sit or consult a qualified specialist workshop immediatel y.
#If safesteering is possible, drive on carefully.
#Vi sit or consult a qualified specialist workshop immediatel y.
440
Displ aymessage s andwarning/indicator lamps

Safety sy stems
Wa rning/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 insuf ficient 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, increased brake pedal forc e may be necessary for braking. Braking char‐
acteristics may be impaired. The braking dis tance in an emergency 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.
Display messages and warning/indicator lamps 44
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