MERCEDES-BENZ S-CLASS SALOON LONG 2022 Owners Manual

Page 591 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions
Ù
R ear axle steering warning
lamp (yellow) * The yellow rear axle steering warning lamp is lit while the vehicle is running.
The rear axle steering is malfunctioning. 
Note the messages on the driver's display.
Ù
R
ear axle steering warning
lamp (red) * The red rear axle steering warning lamp is lit while the vehicle is running.
The rear axle steering is malfunctioning. &
WARNING Risk of accident if s
teering capability is impaired
If the steering does not function as intended, the vehicle's operating safety is jeopardised. 
Pull over and stop the vehicle safely as soon as possible, paying attention to road and tr
aPc conditions. Do not
continue driving under any circumstances. 
Consult a q
ualiNed specialist workshop. 
Note the messages on the driver's display. 588
Display messages and warning/indicator lamps

Page 592 of 645

Engine
Warning/indicator lamp Possible causes/consequences and
P Solutions

Page 593 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions
Note the messages on the driver's display.
If the coolant temperature display is at the lower end of the temperature scale: 
Consult a qualiNed specialist workshop.
If the coolant temperature display is at the upper end of the temperature scale: 
Exit the vehicle and keep a safe distance from it until the engine has cooled down. 
Make sure that the air supply to the radiator is not obstructed. 
Avoiding high loads on the engine, drive to the nearest q
ualiNed specialist workshop. In doing so, ensure that the
coolant temperature display remains below 120°C.

Page 594 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions

Page 595 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions

Page 596 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions
M
Br ake system warning lamp
(yellow) * The yellow brake warning lamp is lit while the vehicle is running. &
WARNING Risk of an accident due t o a brake system malfunction
If the brake system is malfunctioning, braking characteristics may be impaired. 
Drive on carefully. 
Have the brake system checked immediately at a q
ualiNed specialist workshop. The Hill Start Assist may be malfunctioning.

Adjust your speed and drive on carefully, leaving a suitable distance to the vehicle in front. 
If the driver's display shows a display message, observe it. 
Consult a q
ualiNed specialist workshop.
M
Br
ake system warning lamp
(red) * The red brake warning lamp is lit while the vehicle is running.
Possible causes:
= The br
ake force boosting is malfunctioning and the braking characteristics may be aMected.
= There is insuPcient brake Ouid in the brake Ouid reservoir. 
Note the messages on the driver's display. Display messages and warning/indicator lamps
593

Page 597 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions&
WARNING Risk of accident and injur y if brake force boosting is malfunctioning
If brake force boosting is malfunctioning, increased brake pedal force may be necessary for braking. The braking
c
haracteristics may be impaired. The braking distance can increase in emergency braking situations. 
Stop in a safe location immediately. Do not continue driving! 
Consult a q
ualiNed specialist workshop. &
WARNING Risk of an accident due t
o low brake Ouid level
If the brake Ouid le
vel is too low, the braking eMect and the braking characteristics may be impaired. 
Stop the vehicle as soon as possible, paying attention to road and tr
aPc conditions. Do not continue driving. 
Consult a q
ualiNed specialist workshop. 
Do not top up the brake Ouid.594
Display messages and warning/indicator lamps

Page 598 of 645

Driving systems
Warning/indicator lamp Possible causes/consequences and
P Solutions
/
W arning lamp for distance
warning function * The red distance warning lamp lights up while the vehicle is in motion.
The distance to the vehicle in front is too small for the speed selected.
If t here is an additional warning tone, you are approaching an obstacle at too high a speed. 
Be prepared to brake immediately. 
Increase the distance.
Function of Active Brake Assist (  pag
e 287).

Page 599 of 645

Warning/indicator lamp Possible causes/consequences and
P Solutions

Page 600 of 645

Driving safety systems
Warning/indicator lamp Possible causes/consequences and
P Solutions
%
ABS w arning lamp * The yellow ABS warning lamp is lit while the vehicle is running.
ABS is malfunctioning.
If an additional w
arning tone sounds, EBD is malfunctioning.
Other driving systems and driving safety systems may also be malfunctioning. 
Note the messages on the driver's display. &
WARNING Ther
e is a risk of skidding if EBD or ABS is malfunctioning
The wheels may lock during braking.
The s
teerability and braking characteristics are heavily impaired and the braking distance may increase. In addition,
other driving safety systems are switched oM. 
Drive on carefully. 
Have the brake system checked immediately at a q
ualiNed specialist workshop.

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