Troubleshooting
Please refer to at the start of the
chapt
er on page 174.
Adaptive Cruise Control not availa-
bl
e
The indicator lamp lights up yellow. A mes-
sage will also appear on the instrument
cluster display.
— The radar sensor is dirty. Clean the radar
sensor → page 385.
— The radar sensor’s range has been im-
paired by the weather, e.g. by snow, or
residue/layers of cleaning agent. Clean
the radar sensor → page 385.
— The radar sensor’s range is obstructed by
add-on parts, trim frame for licence plate
holders or stickers. Keep the area around
the radar sensor clear → page 389.
— The radar sensor has been displaced or
damaged, e.g. due to damage to the
front of the vehicle. Check whether dam-
age is visible → page 389.
— Fault or malfunction. Switch o and re-
start the engine.
— Painting work or structural modifications
have been performed on the front of the
vehicle.
— If the problem persists, go to a suitably
qualified workshop.
Adaptive Cruise Control is not working
as expected
— The radar sensor is dirty. Clean the radar
sensor → page 385.
— The ultrasound sensors are dirty, covered
or damaged. Clean the ultrasound sen-
sors → page 383.
Keep the area around the ultrasound
sensors clear and check whether any
damage is visible → page 389.
— The system limits have been exceeded
→ page 176.
— The brakes have overheated, control was
cancelled automatically. Leave the
brakes to cool and check them again.
— If the problem persists, go to a suitably
qualified workshop.
Depending on the malfunction, addi-
tional information may be displayed in
the vehicle status → page 34.
Control cannot be started
Make sure the following conditions are
met:
— A position has been selected for driving
forward.
— The brake lights on the vehicle are work-
ing.
— The brake lights on the electrically con-
nected trailer (country-specific) are
working.
— ESC is not performing a control interven-
tion.
— The brake pedal is not depressed.
Unusual noises during automatic brak-
ing
This is normal and is not a fault.
Touch panels do not react as expected
Moisture, dirt and grease can impede the
functioning of the touch panels.
1. Always keep touch panels clean and
dry.
Automatic Emergency Brak-
ing
Introduction
The Automatic Emergency Braking sys-
tem c
an detect imminent frontal colli-
sions and issue corresponding warn-
ings. The system can also assist when
braking and initiate automatic braking.
The Automatic Emergency Braking system
can help to avoid accidents, but is not
a substitute for the full concentration of the
driver.
The Automatic Emergency Braking system
functions only within the system limits. The
warning times vary depending on the trac
situation and driver behaviour.
Automatic Emergency Braking 179
2KF012720AE
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