·
Always set a larger distance in wet or
snowy conditions or when visibility is
poor.
Setting the system behaviour
You can influence how sportily ACC reacts:
—
Vehicles with driving profile selection:
Set
preferred driving profile → page 143.
—
Vehicles without driving profile selection:
Select the desired gearbox program in the
Assist systems menu of the Infotainment
system.
Troubleshooting
Please refer to at the start of the chap-
ACC not available.
The indicator lamp lights up yellow.
— The radar sensor is dirty. Clean the radar
— The view of the radar sensor is impaired
due to the weather conditions, e.g. snow,
or due to detergent deposits or coatings.
Clean the radar sensor → page 355.
— The view of the radar sensor is impaired by
add-on parts, the trim frames of number
plate holders or stickers. Keep the area
around the radar sensor free.
— The radar sensor has been displaced or
damaged, e.g. due to damage to the front
of the vehicle. Check whether damage is
— Fault or malfunction. Deactivate and reac-
tivate the vehicle’s drive system.
— Paint work or structural modifications
were carried out on the front of the vehi-
cle.
— If the problem persists, go to a qualified
workshop.
The ACC does not function as expected.
— The radar sensor is dirty. Clean the radar
— The system limits have been exceeded
— The brakes have overheated, control was
interrupted automatically. Allow the
brakes to cool down and check their func-
tionality again.
— If the problem persists, go to a qualified
workshop.
System control cannot be started.
Make sure that the following conditions are
met:
— The brake lights on the vehicle are work-
ing.
— The brake lights on the electrically con-
nected trailer are in working order.
— ESC is not active.
— The brake pedal is not depressed.
Unusual noises during automatic braking.
— This is normal and is not a fault.
Touch panels react differently than expected.
Moisture, dirt and grease can impede the
functioning of the touch panels.
— Make sure the touch panels are always
clean and dry.
Predictive cruise control
Introduction to the topic
The predictive cruise control adapts the
vehicle speed to detected speed limits
and the course of the road ahead, e.g.
bends, junctions, roundabouts.
The predictive cruise control is an extension
of ACC and makes use of Dynamic Road Sign
156
Driver assist systems