2018 VOLKSWAGEN TIGUAN radar sensor

Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒
Introduction
A message is displayed on the instrument cluster display in the event of malfunctions.
If the malfunction cannot be rectified by one of the listed measures, switch off Front Assist and go
to a qualified workshop. Volkswagen recommends using a Volkswagen dealership for this purpose.
Front Assist is not available, the radar sensor does not have sufficient
visibility
•The radar sensor is dirty. Clean the radar sensor ⇒ Vehicle care.
•The visibility 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 visible ⇒ Repairs and technical modifications.
•Structural modifications have been made to the front of the vehicle.
•The genuine Volkswagen badge is not used.
Front Assist does not function as expected or is triggered unnecessarily
several times
•The radar sensor is dirty. Clean the radar sensor ⇒ Vehicle care.
•The visibility 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 ⇒ Vehicle care.
•The system limits are not met ⇒ System limits.
Lane keeping system (Lane Assistyf
Introduction
This chapter contains information on the followingsubjects:
⇒ Driving with the lane keeping system
⇒ Troubleshooting
The lane keeping system (Lane Assistyf
helps the driver stay in lane.
Using a camera in the windscreen ⇒ Vehicle overviews, the lane keeping system detects lane
markings on the road. If your vehicle moves too close to a recognised lane marking, the system will
warn the driver with a corrective steering intervention. The corrective steering intervention can be
overridden by the driver at any time.
Adaptive lane guidance (depending on vehicle equipmentyf
The adaptive lane guidance system detects the preferred position in a lane and keeps the vehicle in
this position.
Adaptive lane guidance is switched on and off in the Driver assistance menu in the Infotainment
system ⇒ Operation and display in the Infotainment system.
System limits
Use the lane keeping system only on motorways and good main roads.
The system is not active under the following conditions:
•Vehicle speed is less than 60 km/h (37 mphyf.
•Lane keeping system has not detected any lane markings or lane boundaries.

system decelerates the vehicle to a complete stop and switches on the electronic parking brake
automatically ⇒ Electronic parking brake.
When Emergency Assist is actively controlling the vehicle, the hazard warning lights are switched
on and the vehicle performs slight snaking movements within its lane to warn other road users.
The hazard warning lights can be deactivated by pressing the accelerator or brake, by making a
steering intervention or, depending on the situation, by pressing the button for the hazard warning
lights.
When Emergency Assist has been triggered, the system is unavailable until after the ignition has
been switched off and then on again.
Prerequisites
•The lane keeping system and ACC are switched on.
•The selector lever is in position D/S or in the Tiptronic gate.
•The system has detected a lane marking on both the right and left sides of the vehicle
⇒ Fig. 147.
Switching Emergency Assist on and off
Emergency Assist is activated automatically when the lane keeping system ⇒ Lane keeping system 
(Lane Assistyf is switched on.
Conditions for deactivating Emergency Assist
The following conditions can prevent Emergency Assist from reacting, or can cause it to deactivate
automatically:
•If the driver activates the accelerator, brake or steering.
•If one of the prerequisites for operation of the lane keeping system ⇒ Lane keeping system 
(Lane Assistyf or ACC ⇒ Adaptive Cruise Control (ACCyf is no longer fulfilled.
Lane change system (Side AssistyfLQFO5HDU7UDIILF
Alert
Introduction
This chapter contains information on the followingsubjects:
⇒ Driving with the lane change system
⇒ Rear Traffic Alert
⇒ Troubleshooting
The lane change system with Rear
Traffic Alert provides assistance for the
driver when checking for traffic behind
the vehicle.
Radar sensors monitor the area behind the vehicle ⇒ Vehicle overviews. The system measures the
distance and speed difference in relation to other vehicles and informs the driver by means of visual
signals in the exterior mirrors.
The intelligent technology used in Emergency Assist cannot overcome the laws of
physics, and functions only within the limits of the system. The driver is always
responsible for controlling the vehicle.
•Adapt your speed and distance from the vehicles ahead to suit visibility, weather, road
and traffic conditions.
•Your hands should always be on the steering wheel so that you can steer at any time.
•Emergency Assist cannot prevent accidents and serious injuries on its own.
•If the camera's field of view is dirty, covered or damaged, the function of the lane
keeping system may be impaired.
•Emergency Assist does not react to persons, animals or vehicles crossing or
approaching in the same lane.
WARNING
If Emergency Assist is triggered unexpectedly, it can result in accidents and serious
injuries.
•If there is a malfunction in the Emergency Assist system, switch off the lane keeping
system (Lane Assistyf7KLVZLOODOVRVZLWFKRII(PHUJHQF\$VVLVW ⇒ Lane keeping 
system (Lane Assistyf.
•Go to a qualified workshop and have the system checked. Volkswagen recommends
using a Volkswagen dealership for this purpose.
WARNING

The integrated Rear Traffic Alert provides assistance when reversing out of a parking space and
manoeuvring.
System limits
Use the lane keeping system only on paved roads.
The lane change system may interpret the traffic situation incorrectly in the following driving
situations, for example:
•In tight bends.
•When driving in the middle of two lanes.
•When road lanes are of varying width.
•At the brow of a hill.
•In poor weather conditions.
•Where there are special roadside structures, e.g. high or offset crash barriers.
You can save some settings in the user accounts of the personalisation function
⇒ Personalisation.
Driving with the lane change system
Fig. 148 In the exterior mirror housing: visual displays for the lane change system.
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Switching on and off
•By means of the Assist systems menu in the instrument cluster ⇒ Instrument cluster 
operation.
•OR: depending on the vehicle equipment, by means of the button for the driver assist systems
⇒ Button for driver assist systems.
•OR: depending on the vehicle equipment, in the Driver assistance menu in the Infotainment
system ⇒ Operation and display in the Infotainment system.
When the lane change system is switched on, the yellow indicator lamp in the exterior mirror
housing lights up once briefly ⇒ Fig. 148.
This most recent system setting is retained even after the ignition has been switched off and on.
Function
When switched on, the lane change system is active from a speed of around 15 km/h (9 mphyf7KH
lane change system is deactivated at a vehicle speed below 10 km/h (6 mphyf.
The intelligent technology of the lane change system including Rear Traffic Alert cannot
overcome the laws of physics, and functions only within the limits of the system. Never let
the extra convenience afforded by the lane change system including Rear Traffic Alert
tempt you into taking any risks when driving. Always take care when using the lane
change system and the Rear Traffic Alert 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.
•Your hands should always be on the steering wheel so that you can steer at any time.
•Pay attention to the visual displays in the exterior mirror housing and in the instrument
cluster display, and respond to the commands.
•Always pay close attention to what is happening around the vehicle.
•Never use the lane change system including Rear Traffic Alert if the radar sensors are
dirty, covered or damaged. These circumstances can impair the proper functioning of
the system.
•It may be hard to see the display in the exterior mirror in direct sunlight.
WARNING

In the following driving situations, the yellow indicator lamp lights up in the housing of the respective
exterior mirror:
•If your vehicle is being overtaken.
•When overtaking another vehicle with a speed difference of up to approximately 15 km/h
(9 mphyf1RGLVSOD\ZLOOEHVKRZQLIWKHWDNHRYHUPDQRHXYUHLVPXFKIDVWHU.
The yellow indicator lamp flashes if a possible critical situation is detected when you indicate in the
direction of the detected vehicle.
The quicker another vehicle approaches, the earlier there is a corresponding display in the exterior
mirror.
Lane change system Side Assist Plus
If the vehicle is equipped with a lane keeping system and the system is switched on, the driver is
warned by a corrective steering intervention when changing lanes during a possible critical situation
(information level, warning levelyf7KHVWHHULQJLQWHUYHQWLRQDOVRRFFXUVZKHQWKHWXUQVLJQDOLV
activated for the corresponding direction. If the steering intervention is overridden by the driver, the
steering wheel vibrates to give an additional warning.
Automatic deactivation
The lane change system will switch off automatically if the radar sensors are permanently covered.
This can be caused by a layer of ice or snow in front of the radar sensor, for example.
A text message will be shown on the instrument cluster display.
If the lane change system sensor has been automatically deactivated, the system cannot be
activated until the ignition has been switched off and back on again.
The lane change system and Rear Traffic Alert are switched off automatically when the factory-
fitted towing bracket is electrically connected with a trailer or similar ⇒ Trailer towing. The lane
change system and Rear Traffic Alert are automatically switched on again when the trailer is
unhitched from the vehicle. The lane change system and Rear Traffic Alert must be switched off
manually if a non-factory-fitted towing bracket is used.
Brightness
The brightness of the visual display will automatically adapt to the light levels.
The basic brightness level can be set in the Infotainment system ⇒ Operation and display in the 
Infotainment system.
The lane change system is not active during the setting procedure.
Rear Traffic Alert
Fig. 149 Rear Traffic Alert: monitored area around the vehicle leaving the parking space.
Fig. 150 Display in the Infotainment system: Rear Traffic Alert.
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Switching on and off
•By means of the Assist systems menu in the instrument cluster ⇒ Instrument cluster 
operation.

•OR: depending on the vehicle equipment, by means of the button for the driver assist systems
⇒ Button for driver assist systems.
•OR: depending on the vehicle equipment, in the Driver assistance menu in the Infotainment
system ⇒ Operation and display in the Infotainment system.
Function
Rear Traffic Alert monitors the traffic crossing behind the vehicle when reversing out of a parking
space or manoeuvring. Rear Traffic Alert functions using radar sensors in the rear bumper.
Key to ⇒ Fig. 150:
Critical situation. Do not drive on!Possible critical situation.
Detection of a critical situation can also take place acoustically:
•A warning signal will sound and a text message will be displayed in the instrument cluster for
vehicles without Park Distance Control.
•A warning signal will sound with the continuous Park Distance Control tone if Park Distance
Control is installed in the vehicle. If the Park Distance Control is deactivated, no warning can be
given to the driver and the Rear Traffic Alert system will also be switched off temporarily.
If there is a fault in the system's scanned area, the yellow indicator lamp lights up .
Automatic braking intervention to minimise damage
If Rear Traffic Alert detects an approaching road user and the driver has not pressed the brake, the
system can brake automatically.
The Rear Traffic Alert helps the driver to prevent damage by initiating an automatic braking
intervention. Automatic braking intervention takes place when reversing at speeds of between
1-12 km/h (1-7 mphyf7KHYHKLFOHLVKHOGVWDWLRQDU\IRUXSWRWZRVHFRQGVDIWHUYHKLFOHVWDQGVWLOOKDV
been detected.
After automatic braking intervention is activated to prevent damage to the vehicle, the system
requires approximately ten seconds before it can activate another automatic braking intervention.
The automatic braking intervention can be interrupted by pressing the accelerator or brake pedal
sharply and taking control of the vehicle.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒
Introduction
No sensor visibility, error message, system switches itself off
•Clean the radar sensors or remove stickers or accessories from the radar sensors ⇒ Caring for 
and cleaning the vehicle exterior.
•Check whether any damage is visible.
The system is not responding as expected
•The radar sensors are dirty ⇒ Caring for and cleaning the vehicle exterior. The sensor visibility
may be impaired by dirt and snow or also residue from cleaning agents or coatings.
•The prerequisites for system operation must be met ⇒ System limits.
•The radar sensors are covered by water.
•The vehicle is damaged in the area of the radar sensors, e.g. caused by parking collisions.
•The detection ranges of the radar sensors are blocked by add-on parts, e.g. bicycle carriers.
•Changes have been made to the paintwork in the area of the radar sensors or structural
modifications have been made, e.g. on the vehicle front end or the running gear.
•Tinting foils have been retrofitted on the side windows.
The intelligent technology of the lane change system including Rear Traffic Alert cannot
overcome the laws of physics, and functions only within the limits of the system. Do not
let the auxiliary function of the Rear Traffic Alert tempt you to take any risks while driving
– this can cause accidents. The system is not a substitute for the full concentration of the
driver.
•Never use the system with impaired vision or in unpredictable traffic situations, e.g. on
extremely busy roads or across several lanes.
•Always pay attention to the area around the vehicle – cyclists and pedestrians are
often not clearly detected.
•The Rear Traffic Alert will not always independently bring the vehicle to a complete
stop.
WARNING

Repairs and structural modifications should be carried out by a qualified workshop. Volkswagen
recommends using a Volkswagen dealership for this purpose.
•Repainting and paint touch-ups in the area around the sensors may impair the function of the
system in question.
•As the Volkswagen badge influences the view of the radar sensor in the front area, drive the
vehicle only with the original Volkswagen badge.
Engine and transmission guard
An engine and transmission guard can reduce the risk of damage to the underside of the vehicle
and to the engine oil sump.
Depending on where the vehicle is used, it may be a good idea to have an engine and transmission
guard installed, e.g. if the vehicle will be driven over kerbs, on driveways or on unsurfaced roads. If
you wish to have one fitted, Volkswagen recommends contacting your Volkswagen dealership.
Repairs and faults in the airbag system
Repairs and technical modifications must always be carried out according to Volkswagen
specifications⇒.
Modifications and repairs to the front bumper, the doors, the front seats, the headliner, or the
bodywork should be carried out by a qualified workshop. System components and airbag system
sensors might be fitted on these vehicle components.
If you work on the airbag system or remove and install parts of the system when performing other
repair work, parts of the airbag system may be damaged. The consequence may be that, in the
event of an accident, the airbag inflates incorrectly or does not inflate at all.
Regulations must be observed to ensure that the effectiveness of the airbags is not reduced and
that removed parts do not cause any injuries or environmental pollution. Qualified workshops are
familiar with these requirements.
Any modifications to the vehicle's suspension could prevent the airbag system from working
properly during a collision. For example, using tyre/rim combinations that have not been approved
by Volkswagen, lowering the vehicle, making modifications to the suspension rate including work on
the springs, struts and shock absorbers could change the forces that are measured by the airbag
sensors and sent to the electronic control unit. Some changes to the suspension could cause the
forces measured by the sensors to increase, for example. This can lead to the airbag system being
triggered in collision scenarios where it normally would not be triggered if modifications to the
suspension had not been made. Other modifications can cause the forces measured by the
sensors to decrease, therefore preventing the airbag system from being triggered when it should
have been.
Incorrect repairs and modifications can cause malfunctions and damage to the vehicle
and impair the effectiveness of the driver assist systems. This can result in accidents and
severe injuries.
•Repairs and modifications to your vehicle should be carried out only by a qualified
workshop.
WARNING
Unsuitable spare parts and accessories, incorrectly carried out work, modifications and
repairs can lead to damage to the vehicle and cause accidents and serious injuries.
•Volkswagen strongly recommends you use only approved Volkswagen accessories
and Volkswagen Genuine Parts. These parts and accessories have been specially
tested by Volkswagen for suitability, reliability and safety.
•Repairs and modifications to your vehicle should only be carried out by a qualified
workshop. Qualified workshops have the necessary tools, diagnostic equipment, repair
information and qualified personnel.
•Never fit parts to your vehicle that are in any way different from the factory-fitted parts.
•Never secure or mount objects such as drink holders or telephone holders either on or
next to the airbag covers or within the deployment zones of the airbag modules.
•Only use rim/tyre combinations which have been approved by Volkswagen for your
vehicle type.
WARNING
®