
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.
Radar sensor
ACC detects driving situations by means of the radar sensor at the front of the vehicle ⇒ Front
view. The range of the radar sensor is up to approximately 120 m.
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.
If the vehicle has ACC, the cruise control system is not available as an independent system.
Special driving situations
Fig. 142 On the instrument cluster display: slower vehicle detected in the left-hand lane
(illustration).
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 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.
•Do not use the ACC in poor visibility, on steep or winding roads, on slippery road
surfaces, e.g. on snow, ice, wet roads, loose chippings, or on flooded roads.
•Never use ACC off-road or on non-surfaced roads. The ACC is designed for use on
surfaced roads only.
•ACC does not respond to stationary vehicles.
•The ACC does 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.
WARNING
®

Traffic Jam Assist is not active (the indicator lamp for the lane keeping
system lights up yellow)
•As soon as one of the conditions indicated on ⇒ Technical requirements for using Traffic Jam
Assist is no longer fulfilled.
•If one of the conditions for the proper functioning of the lane keeping system is no longer
fulfilled ⇒ Lane keeping system (Lane Assist).
•If one of the conditions for the proper functioning of the Adaptive Cruise Control (ACC) is no
longer fulfilled ⇒ Adaptive Cruise Control (ACC).
Switch off Traffic Jam Assist in the following situations
Traffic Jam Assist should always be switched off in the following situations due to system
limitations:
•When a high level of concentration is required by the driver.
•Very sporty driving.
•In poor weather conditions, e.g. snow or heavy rain.
•Poor road conditions.
•Driving through road works.
•In urban areas.
If Traffic Jam Assist does not function as described in this chapter, do not use the system
and go to a qualified workshop.
If there is a fault in the system, visit a qualified workshop and have the system checked.
Emergency Assist
Emergency Assist detects a lack of
activity on the part of the driver and can
keep the vehicle in lane automatically,
or brake the vehicle to a standstill if
required. The system can therefore
actively help to prevent an accident.
Emergency Assist is an extension of the lane keeping system (Lane Assist) ⇒ Lane keeping
system (Lane Assist), and combines this function with the Adaptive Cruise Control (ACC)
⇒ Adaptive Cruise Control (ACC). Please therefore read both these chapters and observe the
information about the system limits and warnings.
Description
If there is no driver activity, Emergency Assist prompts the driver to take control of the vehicle again
by visual and acoustic warnings and by braking jolts.
If the driver remains inactive, the system automatically controls the accelerator, brake and steering
to slow the vehicle down and keep it in lane ⇒. If there is sufficient stopping distance, the
The intelligent technology of Traffic Jam Assist cannot overcome the laws of physics, and
functions only within the limits of the system. Always take care when using Traffic Jam
Assist as you could otherwise cause accidents or injuries. 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.
•Do not use Traffic Jam Assist in urban traffic.
•Do not use Traffic Jam Assist in poor visibility, on steep or winding roads, or on
slippery road surfaces e.g. on snow, ice, wet roads, loose chippings or flooded roads.
•Never use Traffic Jam Assist off-road or on unsurfaced roads. Traffic Jam Assist is
designed solely for use on surfaced roads.
•Traffic Jam Assist does not react to persons, animals or vehicles crossing or
approaching in the same lane.
•If the speed reduction achieved by Traffic Jam Assist is insufficient, brake the vehicle
immediately by depressing the foot brake.
•If the vehicle starts to roll unintentionally after the driver has been prompted to take
control of the vehicle, brake the vehicle immediately using the foot brake.
•If a prompt instructing the driver to take control of the vehicle appears on the
instrument cluster display, take control of the vehicle immediately.
•Your hands should always be on the steering wheel so that you can steer at any time.
The driver is always responsible for staying in lane.
•The driver must be prepared to take control of the vehicle (by accelerating or braking)
at all times.
WARNING

Troubleshooting
Warning and indicator lamps on the instrument cluster display
Fault in electronic parking brake. Go to a qualified workshop.
Electronic parking brake does not switch off
The electronic parking brake will not switch itself off if the prerequisites for switching off are not met
or the 12-volt vehicle battery is discharged. Use jump leads ⇒ Jump starting.
Noises of the electronic parking brake
•Noises may be heard when the electronic parking brake is switched on or off.
•If the electronic parking brake has not been used for a long period, the system will carry out
occasional automatic and acoustic checks when the vehicle is parked.
Auto Hold function
Fig. 152 In the centre console: button for the Auto Hold function.
Description of the Auto Hold function
The Auto Hold function can hold the vehicle stationary. The vehicle does not have to be held on the
foot brake.
Old: The Auto Hold function is active when the indicator lamp in the button
⇒ Fig. 152 (arrow) lights up yellow and the indicator lamp in the instrument cluster display
lights up green.
New: The activated Auto Hold function holds the vehicle stationary when the indicator lamp
lights up green on the instrument cluster display.
The Auto Hold function stops holding the vehicle when it starts to move away.
If any of the conditions for the Auto Hold function change while the vehicle is stationary, the Auto
Hold function will switch off automatically. The green indicator lamp in the instrument cluster
display then goes out together with the yellow indicator lamp in the button.
Switching on the Auto Hold function
The Auto Hold function can be switched on when the driver door is closed and the engine has been
started.
•Press the button ⇒. The indicator lamp ⇒ Fig. 152
in the button (arrow) lights up yellow. The Auto Hold function is operational, but the vehicle is
not necessarily held stationary ⇒.
The incorrect use of the electronic parking brake can cause accidents and serious
injuries.
•Never use the electronic parking brake to brake the vehicle, except in emergencies.
The braking distance is considerably longer as only the rear wheels are braked. Always
use the foot brake.
•Never activate the accelerator from the engine compartment if a position or gear has
been selected and the engine is running. The vehicle could move, even if the electronic
parking brake is applied.
WARNING
Exiting the vehicle incorrectly can cause the vehicle to roll away. This can cause
accidents, serious injuries and damage to property.
•Always park the vehicle in the specified order ⇒ Parking.
•Before leaving the vehicle, make sure that the electronic parking brake is switched on
and that the indicator light lights up red on the instrument cluster display when
the ignition is switched off.
WARNING

The cigarette lighter socket can also be used as a 12-volt socket ⇒ Electrical sockets.
Electrical sockets
Introduction
This chapter contains information on the followingsubjects:
⇒ Sockets in the vehicle
Electrical equipment can be connected to the sockets in the vehicle.
The electrical devices must be in good condition. Do not use faulty devices.
The 12-volt socket will work only when the ignition is switched on.
Using electrical consumers with the engine switched off and the ignition switched on will
drain the 12-volt battery.
Unshielded devices can cause interference in the Infotainment system and vehicle
electronics.
Sockets in the vehicle
Fig. 177 In the front stowage compartment, in the rear centre console or in the luggage
compartment on the left-hand side: folding 12-volt socket ① or 12-volt socket with removable cover
②.
Improper use of the cigarette lighter can cause fires, burns and other serious injuries.
•Always use the cigarette lighter properly, and only use it to light tobacco products.
•Never leave children in the vehicle unattended. The cigarette lighter can be used when
the ignition is switched on.
WARNING
Improper use of the sockets and electrical accessories can cause fires and severe injuries.
•Never leave children in the vehicle unattended. Sockets and the devices connected to
them can be used when the ignition is switched on.
•If the electrical device gets too hot, switch off the device immediately and disconnect it
from the socket.
WARNING
•In order to prevent damage to the electrical system, never connect equipment that
supplies electric power, such as solar panels or battery chargers for charging the 12-
volt battery, to the 12-volt socket.
•Only use electrical devices that have been approved in accordance with current
guidelines concerning electromagnetic compatibility.
•In order to avoid damage due to voltage fluctuation, always switch off any electrical
devices before switching the ignition or the engine on or off. When the start/stop
system automatically switches off and restarts the engine, it is not necessary to switch
off any connected electrical consumers.
•Never connect electrical devices requiring more than the rated power to a 12-volt
socket. The vehicle's electrical system can be damaged if the maximum power output is
exceeded.
•Observe the operating instructions for any electrical device that you plug into the
socket.
NOTICE

Trailer towing
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Headlight adjustment
Towing a trailer can raise the front end of the vehicle enough for the dipped beam to blind other
road users. Use the headlight range control to lower the light cone as required. Vehicles with
automatic headlight range adjustment are adjusted automatically.
Things to note when driving with a trailer
•If the trailer has an overrun brake, apply the brakes gently at first and then firmly. This will
prevent the jerking that can be caused by the trailer wheels locking.
•The combination weight causes the braking distance to increase.
•Engage a lower gear prior to inclines (manual gearbox or Tiptronic mode of the automatic
gearbox) to additionally make use of engine braking. The brake system could otherwise
overheat and fail.
•The vehicle's centre of gravity and, in turn, the vehicle's handling, will change because of the
trailer load and the increased combined towing weight of the vehicle and trailer.
•The weight distribution of a loaded trailer with an unladen towing vehicle is very unfavourable.
When driving in this situation, drive particularly carefully and slowly.
Pulling off on slopes when towing a trailer
A vehicle towing a trailer is liable to roll back a short distance when moving off on a slope,
depending on the angle of the slope and the total weight of the trailer and vehicle.
When towing a trailer, pull off on slopes as follows:
•Depress and hold the brake pedal.
•Press button once to switch off the electronic parking brake ⇒ Electronic parking
brake.
•Manual gearbox: depress the clutch fully.
•Select first gear ⇒ Manual gearbox: selecting a gear or selector lever position D/S⇒ DSG dual
clutch gearbox.
•Pull on the button and hold it in this position to hold the vehicle and trailer with the
electronic parking brake.
•Release the brake pedal.
•Pull away slowly. To do this, slowly release the clutch pedal for a manual gearbox.
•Only let go of the button when the engine has sufficient power to move off.
Trailer stabilisation
First read and observe the introductoryinformation and safety warnings⇒
Introduction
The trailer stabilisation function can detect if an attached trailer is starting to lurch from side to side
and can provide countersteer.
Trailer stabilisation is a subsidiary function of the Electronic Stability Control (ESC).
®
Incorrect trailer towing can cause loss of vehicle control and serious personal injury.
•Towing a trailer and transporting heavy or bulky items can change the way the vehicle
handles and increase the braking distance.
•Always drive carefully and think ahead. Brake earlier than in normal driving.
•Always adapt your speed and driving style to suit visibility, weather, road and traffic
conditions. Reduce your speed, particularly when going downhill.
•Accelerate carefully and gently. Avoid abrupt and sudden driving and braking
manoeuvres.
•Take special care when overtaking. Reduce your speed immediately if the trailer shows
even the slightest sign of snaking.
•Never try to stop a trailer from snaking by increasing your speed.
•Keep to speed limits which may be lower for vehicles with trailers than for vehicles
without trailers.
WARNING

Park the vehicle on a firm and level surface at a safe distance from the flow of traffic.
Switch on the electronic parking brake Electronic parking brake.
Turn the light switch to position 0 Lights.
Move the turn signal lever to neutral position Lights.
Move the automatic gearbox selector lever to position P DSG® dual clutch gearbox.
Switch off the ignition and remove the vehicle key from the ignition lock Starting and
stopping the engine.
Manual gearbox: select a gear Manual gearbox: selecting a gear.
Switch off the orientation lighting Lights.
Leave the defective bulbs to cool down.
You can change the following bulbs yourself:
•Bulbs in the halogen headlight: dipped beam, main beam, daytime running light, side light, turn
signal.
•Bulbs in front bumper: fog lights, static cornering light.
•Bulbs in the tail light clusters: rear turn signal, if it does not feature LED technology (depending
on vehicle equipment level).
All other bulbs and lamps in the vehicle should always be changed by an expert.
Additional bulb specifications
Some bulbs in headlights or in tail light clusters might have factory specifications that are different
to standard bulbs. The designation is inscribed on the bulb, either on the glass part or on the base.
LED bulbs on the vehicle
•Brake light, rear fog light, tail light, turn signal and reversing light in the tail light clusters.
•Dipped beam, main beam, daytime running lights, static cornering light, side lights and turn
signal.
•Number plate light.
Owners cannot replace the LEDs themselves. If some LEDs fail, this may be an indication that
more elements are on the point of failure. If this happens, have the bulbs checked and replaced if
necessary at a qualified workshop.
Checklist Information on changing bulbs
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Checklist
Always carry out the following actions for changing a bulb in the given order ⇒:
Accidents can occur if roads are not sufficiently illuminated and other road users have
difficulty seeing the vehicle, or cannot see it at all.
WARNING
Changing the bulb incorrectly can cause accidents and serious injuries.
•When working in the engine compartment, always read and observe the safety
warnings ⇒ In the engine compartment. The engine compartment of any motor vehicle
is a dangerous area. Serious injuries can be sustained here.
•H7/H15 bulbs are pressurised and could explode when they are being changed.
•Only change the defective bulb once it has had time to cool down completely.
•Never change a bulb unless you are familiar with the procedure. If you are uncertain of
what to do, the work should be carried out by a qualified workshop.
•Do not touch the glass part of the bulb with unprotected fingers. When the light is
switched on, heat will cause fingerprints to evaporate on the bulb, which in turn will
cause the reflector to dim.
•There are sharp-edged parts in the headlight housing in the engine compartment and
on the tail light cluster housing. Protect your hands when changing bulbs.
WARNING
Damage to the electrical system can be caused by water entering the system if the rubber
covers or plastic caps on the headlight housing are not properly mounted after a bulb has
been changed.
NOTICE

Park the vehicle on a level and stable surface.
Depress and hold the brake pedal until you have switched off the ignition.
Switch on the electronic parking brake Electronic parking brake.
Select the neutral position Manual gearbox: selecting a gear or move the selector lever to
position P DSG® dual clutch gearbox.
Switch off the ignition and remove the vehicle key from the ignition lock Starting and
stopping the engine.
Service fluids leaks are harmful to the environment. So you should regularly check the
ground underneath your vehicle. If there are spots of oil or other service fluids on the ground, the
vehicle should be inspected by a qualified workshop. Any spilt service fluids must be disposed of
properly.
Preparing the vehicle for working in the engine compartment
Checklist
The following steps should always be carried out in the specified order before working in
the engine compartment ⇒:
There are rotating components in the engine compartment that can cause serious injury.
•Never place your hand near these components or in the radiator fan. Touching the
rotary blades can result in serious injuries. The fan is temperature-controlled and can
start automatically, even if the ignition has been switched off and the vehicle key has
been removed from the ignition lock.
•If any work has to be performed when the engine is started or with the engine running,
there is an additional, potentially fatal, safety risk from the rotating parts, such as the
poly V-belts, alternator, radiator fan etc., and from the high-voltage ignition system.
Always be particularly careful.
- Always ensure that no body parts, jewellery, ties, loose items of clothing or long
hair can be caught up in rotating engine components. Before starting work,
remove any jewellery and ties, tie up long hair and pull clothes in tightly to avoid
them getting caught in the engine compartment.
- Always take due care and attention when depressing the accelerator. The vehicle
could move, even if the electronic parking brake is applied.
•Always ensure you have not left any objects, such as cleaning cloths and tools, in the
engine compartment. Any forgotten items can cause malfunctions, engine damage and
fires.
WARNING
Additional insulating materials such as covers in the engine compartment could disrupt
the operation of the engine, start fires and lead to severe injuries.
•Never cover the engine with any insulating materials.
WARNING
Service fluids and some materials in the engine compartment are highly flammable and
can cause fires and serious injuries!
•Never smoke in the vicinity of the engine compartment.
•Never work near naked flames or sparks.
•Never spill fluids onto the engine. They could ignite on hot engine components and
hence cause injuries.
•Please note the following when carrying out any work on the fuel system or the
electrical system:
- Always disconnect the 12-volt vehicle battery. Ensure that the vehicle is
unlocked when the 12-volt vehicle battery is disconnected as otherwise the anti-
theft alarm will be activated.
- Never work in the direct proximity of heating systems, water heaters or any other
open flames.
•Always have a fully functional and tested fire extinguisher to hand.
WARNING
When topping up or changing service fluids, ensure that you pour the correct service
fluids into the correct openings. The use of incorrect service fluids could result in serious
malfunctions and engine damage.
NOTICE

•Open the Vehicle settings menu in the Infotainment system.
•Touch the Tyres function button.
•Touch the SET function button.
•When all four tyre pressures correspond to the required values, touch the Confirm function
button.
After an extended driving time with driving at different speeds, the system will automatically learn
the new values and monitor them.
•If the tyre pressures have been changed.
•If one or more wheels have been changed.
•If the wheels have been swapped round, e.g. from front to rear ⇒ Rotating wheels front to rear.
The Tyre Pressure Loss Indicator stops working if there is a fault in the ESC or ABS ⇒ Brake
support systems.
After a warning about the tyre pressure being too low, switch the ignition off and then back
on again. The Tyre Pressure Loss Indicator can only then be re-synchronised.
Tyre Pressure Monitoring System
Fig. 234 Typical display in the instrument cluster: current tyre pressures.
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Key to ⇒ Fig. 234:
Target pressure in bar.
Actual pressure in bar.
Loss in pressure in front left.
System fault for rear right tyre.
The Tyre Pressure Monitoring System (TPMS) monitors the tyre pressure of the four wheels while
the vehicle is in motion using pressure sensors on the tyres. The system warns the driver in the
event of a pressure loss.
Display of tyre pressures on the instrument cluster
Open the menu Vehicle status in the instrument cluster display ⇒ Instrument cluster. The vehicle
is displayed with the target and actual pressures of all the wheels ⇒ Fig. 234.
When the ignition is switched on, the last measured tyre pressures will be displayed first; these
values will be updated when the journey is started. If the tyre pressure is too low, the respective
actual values and the affected tyres will be marked ⇒ Fig. 234.
If the tyres are in rest state, the sensors will not transmit any tyre pressures. This stops the sensor
batteries discharging.
If no tyre pressures are transmitted, the last received values are shown in grey.
Switching the Tyre Pressure Monitoring System on and off
Observe any country-specific legal requirements for the Tyre Pressure Monitoring System.
If a set of tyres is fitted to the vehicle where the tyres either do not have wheel sensors or have
wheel sensors that are not compatible with the vehicle, the indicator lamp will flash for
approximately one minute and then light up steadily. The tyre pressures will not be monitored. The
system cannot be switched off.
Adjusting the tyre pressure
Following any relevant change in the vehicle load, the tyre pressure must be checked and altered
as necessary. The tyre pressures recommended for the vehicle are on a sticker on the driver door
pillar or on the inside of the tank flap ⇒ Tyre pressure.
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