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Fig. 117 Left-hand side of the multifunction steering wheel: buttons for operating the speed limiter.
First read and observe the introductoryinformation and safety warnings⇒Introduction
Switching on
Press the button.
The speed last set remains stored. There is no control yet.
Starting control
While driving, press the button.
The current speed is stored as the maximum speed. The green indicator lamp .
Setting the speed
You can adjust the stored speed:
+ 1 km/h (1 mph)-1 km/h (1 mph)+ 10 km/h (5 mph)- 10 km/h (5 mph)
To continuously adjust the stored speed, press and hold the button or .
Interrupting control
Press the button.
The speed remains stored in the memory.
Resuming control
Press the button.
The speed limiter is automatically reactivated as soon as the current speed is lower than the stored
speed.
Switching off
Press and hold the button.
The speed limiter is switched off, the speed remains stored (even after the ignition is switched off).
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Changing to Adaptive Cruise Control (ACC)
Press the button.
The speed limiter is switched off.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒Introduction
Control is automatically interrupted.
Malfunction. Switch off the speed limiter and go to a qualified workshop.
For safety reasons, the speed limiter does not fully deactivate itself until you release the accelerator
once or switch the system off manually.
Adaptive Cruise Control (ACC)
Introduction
This chapter contains information on the followingsubjects:
⇒ Special driving situations
⇒ Limits of ACC
⇒ Switching ACC on and off
⇒ Setting ACC
⇒ Troubleshooting
The Adaptive Cruise Control (ACC) maintains a speed selected by the driver. If the vehicle
approaches a vehicle in front, the ACC automatically adapts the speed so that a distance you have
selected is maintained.
Speed range
ACC controls the vehicle in the speed range between 30 km/h (20 mph) and 160 km/h (100 mph)
or 210 km/h (130 mph). This speed range may differ in certain markets.
Driving with ACC
You can override the ACC at any time. Control will be interrupted when you brake. If you accelerate,
control will be interrupted for the duration of the acceleration process and will then continue again.
Control by ACC is less dynamic when towing a trailer ⇒ . The ACC will not perform control operation
if the trailer's brake lights are faulty.
Does the vehicle have ACC?
The vehicle is equipped with ACC if you can make settings for ACC in the vehicle settings of the
Infotainment system ⇒ Vehicle settings menu .
Brake request
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If automatic deceleration by ACC is not sufficient, ACC will request you to brake additionally by a
corresponding message on the instrument cluster. In addition, the red warning lamp lights up
and an acoustic warning is given. Brake immediately!
Radar sensor
ACC detects driving situations by means of the radar sensor at the front of the vehicle ⇒ Front view .
The radar sensor has a range of up to approximately 120 m.
WARNING
The intelligent technology used in the ACC cannot overcome the laws of physics, and functions only
within the limits of the system. Never let the extra convenience tempt you into taking safety risks
when driving. Careless or unintentional use of the Adaptive Cruise Control (ACC) can cause accidents
and lead to serious injury. The system is not a substitute for the full concentration of the driver.
Adapt your speed and distance from the vehicles ahead to suit visibility, weather, road and traffic
conditions.
Never use the ACC in poor visibility, on steep or winding roads, or on slippery road surfaces e.g. due
to snow, ice, wet roads, loose chippings, or on flooded roads.
Never use the ACC offroad or on non-surfaced roads. The ACC is designed for use on surfaced roads
only.
The ACC will not react to stationary vehicles.
The ACC will not react to persons, animals or vehicles crossing or approaching in the same lane.
Brake immediately if speed reduction by ACC is not sufficient.
Brake immediately if a request to brake appears on the instrument cluster display.
Brake if the vehicle starts rolling unintentionally after a request to brake.
Be prepared to control the speed yourself at all times.
Special driving situations
Fig. 118 On the instrument cluster display: slower vehicle detected in the left-hand lane (illustration).
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First read and observe the introductoryinformation and safety warnings⇒Introduction
Overtaking
If you indicate left (left-hand traffic: indicate right) to overtake, ACC will accelerate the vehicle and
reduce the distance from the vehicle in front. Your set speed will not be exceeded.
If ACC does not detect any vehicle in front after you have changed lane, ACC will accelerate the
vehicle up to the set speed.
Stop-and-go traffic
ACC can brake vehicles with DSG® dual clutch gearbox to a standstill and hold them stationary. ACC
remains active and the instrument cluster display shows ACC ready for a few seconds. During this
time the vehicle will move off again automatically as soon as the vehicle in front moves off
(depending on the vehicle equipment level and not available in all countries).
Press the button.
Press the button or briefly press the accelerator.
The vehicle is stationary for longer than approximately three minutes.
A vehicle door is opened.
The ignition is switched off.
Avoiding overtaking on the right (left-hand traffic: overtaking on the left)
If ACC detects a slower vehicle in the left-hand lane (left-hand traffic: in the right-hand lane), ACC
will brake the vehicle gently within the system limits and therefore prevent a prohibited overtaking
manoeuvre ⇒ Fig. 118 . The function is active from speeds of around 80 km/h (50 mph), but is not
available in all countries.
WARNING
If the message ACC ready is shown on the instrument cluster display and the vehicle in front moves
off, your vehicle will move off automatically. In some cases the radar sensor may be unable to detect
obstacles that are located in the vehicle's path. This can result in serious injury and accidents.
Always check the road ahead before moving off and brake the vehicle if necessary.
Limits of ACC
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Fig. 119 Driving through bends. Vehicles outside the range of the radar sensor.
Fig. 120 Vehicle changes lane. Turning vehicle and stationary vehicle.
First read and observe the introductoryinformation and safety warnings⇒Introduction
When not to use ACC
Driving in heavy rain, snow or heavy spray.
Driving through tunnels.
Driving through road works.
Driving on twisting roads, e.g. mountain roads.
Driving offroad.
Driving in multi-storey car parks.
Driving on roads with embedded metal objects, e.g. railway tracks.
Driving on roads with loose chippings.
Vehicles without inside overtaking prevention function: driving on multi-lane roads when
vehicles in the overtaking lane are driving more slowly.
Delayed response
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If the radar sensor is exposed to environmental conditions that impair sensor functioning, the
system may detect this only after a certain time. For this reason, possible functional restrictions may
be displayed only after a delay at the start of the journey and when driving ⇒ .
Objects that cannot be detected
Persons.
Animals.
Stationary vehicles.
Crossing or oncoming vehicles.
Other stationary obstacles.
If a stationary vehicle is hidden behind a vehicle that has been detected by the adaptive cruise
control and this vehicle turns off the road or changes lane, the ACC will not react to the stationary
vehicle ⇒ Fig. 120 .
Bends
The radar sensor always measures straight ahead. For this reason, vehicles may be incorrectly
detected or vehicles driving ahead not detected in tight bends ⇒ Fig. 119 .
Vehicles outside the sensor range
Vehicles that are driving outside the sensor range in close proximity to your vehicle, e.g. motorbikes
⇒ Fig. 119 .
Vehicles that change into your lane directly in front of your vehicle ⇒ Fig. 120 .
Vehicles with bodies or attachments that project beyond the vehicle.
WARNING
If you use ACC in the above situations, this can result in accidents and serious injuries as well as
violation of legal regulations.
Switching ACC on and off
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Fig. 121 Left-hand side of the multifunction steering wheel: buttons for operating ACC.
First read and observe the introductoryinformation and safety warnings⇒Introduction
Switching on ACC
Press the button.
The indicator lamp lights up grey, ACC does not regulate.
Starting control
Press the button while driving forwards.
ACC stores the current speed and maintains the set distance. If the current speed is outside the
defined speed range, ACC will set the minimum speed (when driving more slowly than the limit) or
maximum speed (when driving faster than the limit).
The following indicator lamps light up, depending on the driving situation:
ACC regulating.No vehicle has been detected ahead.Vehicle detected ahead (white).
Interrupting control
Briefly press the button or press the brake pedal.
The indicator lights up grey, the speed and distance remain stored.
Control is automatically interrupted if the traction control system (TCS) is deactivated.
Resuming control
Press the button.
ACC adopts the last set speed and last set distance. The instrument cluster display shows the set
speed and the indicator lamp lights up green.
Switching off ACC
Press and hold the button.
The set speed is deleted.
Changing to the speed limiter
Press the button.
ACC is switched off.
Setting ACC
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Fig. 122 On the instrument cluster display: setting the distance (illustration, ACC regulating).
First read and observe the introductoryinformation and safety warnings⇒Introduction
Setting the distance
You can set the distance in five steps from very small to very large:
Press the button and then the or button.
Alternatively, press the button as often as necessary until the desired distance is set.
The instrument cluster display shows the chosen distance setting ⇒ Fig. 122① . Please observe any
country-specific requirements for the minimum distance.
You can set the distance which should be set at the start of control operation in the vehicle settings
of the Infotainment system ⇒ Vehicle settings menu .
If ACC is not regulating, the set distance and vehicle are not highlighted on the instrument cluster
display.
Setting the speed
You can adjust the stored speed within the defined speed range by means of the buttons on the
multifunction steering wheel:
+ 1 km/h (1 mph)- 1 km/h (1 mph)+ 10 km/h (5 mph)- 10 km/h (5 mph)
Press and hold the corresponding button to continuously change the stored speed.
Setting the control behaviour
Vehicles with driving profile selection: set the desired driving profile ⇒ Driving profile selection
and 4MOTION Active Control .
Vehicles without driving profile selection: set the desired gearbox programme in the vehicle
settings of the Infotainment system ⇒ Vehicle settings menu .