Driver support -> Pilot Assist for Your Volvo Xc90 SUV 2020

DRIVER SUPPORT  
Pilot Assist*38  
The driver sets the desired speed and distance  
to the vehicle ahead. Pilot Assist monitors the  
distance to the vehicle ahead and the traffic  
lane's side markers using the camera and  
radar sensor. The system maintains the set  
time interval to the vehicle ahead by automati-  
cally adjusting your vehicle's speed and keeps  
your vehicle in its lane by providing steering  
assistance.  
WARNING  
Pilot Assist can help the driver keep the vehi-  
cle in the current traffic lane by providing  
steering assistance and maintaining an even  
speed and a set time interval to the vehicle  
ahead.  
Pilot Assist is deactivated automatically  
and resumes working without prior notice.  
The color of the steering  
wheel symbol indicates the  
current status of steering  
assistance:  
How Pilot Assist works  
The Pilot Assist function is primarily intended  
for use on highways and other major roads  
where it can help provide a more comfortable  
and relaxing driving experience.  
• GREEN indicates that  
steering assistance is active  
If the Curve Speed Assist (CSA)* function is  
activated, it may also affect the vehicle's  
speed.  
• GRAY (as shown in illustration) indicates that  
steering assistance is deactivated.  
Pilot Assist's steering assistance is based on  
monitoring the direction of the vehicle ahead  
and the traffic lane's side marker lines. The  
driver can override Pilot Assist's steering rec-  
ommendations at any time and steer in  
another direction, e.g. to change lanes or avoid  
obstacles on the road.  
If the camera/radar sensor cannot detect the  
lane's side marker lines or if Pilot Assist is  
unable for some other reason to clearly inter-  
pret the lane, Pilot Assist will temporarily  
deactivate steering assistance until it can once  
again interpret the lane markings. However,  
the speed and distance warnings will remain  
active. The driver will be alerted by slight  
vibrations in the steering wheel that the func-  
tion has been temporarily deactivated.  
The camera/radar sensor monitors the distance to  
the vehicle ahead and detects lane markings.  
Camera and radar sensor  
Distance monitor  
Lane marker line monitors  
38  
Depending on market, this function can be either standard or optional.  
296  
* Option/accessory.  
 
DRIVER SUPPORT  
camera and radar sensor, braking may occur  
unexpectedly or not at all.  
Pilot Assist strives to keep the vehicle  
in the center of the lane  
WARNING  
The function is supplementary driver  
support intended to facilitate driving  
and help make it safer – it cannot han-  
dle all situations in all traffic, weather  
and road conditions.  
When Pilot Assist provides steering assis-  
tance, it strives to position the vehicle in the  
center of the lane between the lane markings.  
To make the driving experience as smooth as  
possible, the driver should permit the vehicle  
to find good positioning. The driver should  
check that the vehicle is positioned safely in  
the lane and can always adjust the vehicle's  
position by applying more force to the steering  
wheel.  
Pilot Assist attempts to follow a vehicle ahead  
in the same lane and maintain a time interval  
to that vehicle set by the driver. If the radar  
sensor does not detect a vehicle ahead, it will  
instead maintain the speed set by the driver.  
This will also happen if the speed of the vehi-  
cle ahead exceeds the set speed for your vehi-  
cle.  
The driver is advised to read all sec-  
tions in the Owner's Manual about this  
function to learn of its limitations,  
which the driver must be aware of  
before using the function.  
Driver support functions are not a sub-  
stitute for the driver's attention and  
judgment. The driver is always respon-  
sible for ensuring the vehicle is driven  
in a safe manner, at the appropriate  
speed, with an appropriate distance to  
other vehicles, and in accordance with  
current traffic rules and regulations.  
If Pilot Assist does not position the vehicle  
appropriately in the lane, the driver should  
turn off Pilot Assist or switch to Adaptive  
Cruise Control*.  
Only a workshop may perform mainte-  
nance on driver support components – an  
authorized Volvo workshop is recom-  
mended.  
Hands on the steering wheel  
Pilot Assist only functions if the driver's hands  
are on the steering wheel.  
In curves and forks in the road  
Pilot Assist is designed to interact with the  
driver. The driver should never wait for steer-  
ing assistance from Pilot Assist, but instead  
should always be ready to increase his or her  
own steering efforts, particularly in curves.  
If Pilot Assist detects that the  
driver's hands are not on the  
steering wheel, a symbol and  
text message will appear to  
instruct the driver to actively  
steer the vehicle.  
Pilot Assist regulates speed by accelerating  
and braking. It is normal for the brakes to emit  
a slight sound when they are being used to  
adjust speed.  
When the vehicle is approaching an off-  
ramp or a fork in the road, the driver  
should steer toward the desired lane to  
indicate to Pilot Assist the desired direc-  
tion of travel.  
Pilot Assist attempts to smoothly regulate  
speed. The driver must apply the brakes in sit-  
uations requiring immediate braking. For  
example, when there are great differences in  
speed between vehicles or if the vehicle ahead  
brakes suddenly. Due to limitations in the  
If the driver's hands are still not detected on  
the steering wheel after a few seconds have  
passed, the instructions to actively steer the  
vehicle will be repeated, accompanied by an  
audible signal.  
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* Option/accessory. 297  
DRIVER SUPPORT  
Pilot Assist*39 controls and display  
A summary of how Pilot Assist is controlled  
using the right-side steering wheel keypad  
and how the function is shown in the display.  
: Increases the set speed  
: Reduces the set speed  
|| If Pilot Assist still does not detect the driver's  
hands on the steering wheel after a few more  
seconds have passed, the audible signal will  
become intense and the steering function will  
switch off. Pilot Assist must then be reactiva-  
Increases the time interval to the vehicle  
ahead  
Controls  
ted by pressing the  
wheel.  
button on the steering  
Reduces the time interval to the vehicle  
ahead  
Related information  
: Switches from Pilot Assist to Adaptive  
Cruise Control  
Driver support systems (p. 276)  
Function symbol  
Symbols for target vehicle  
Symbol for time interval to the vehicle  
ahead  
Symbol for activated/deactivated steering  
assistance  
Function buttons and symbols.  
: Switches from Adaptive Cruise Control*  
to Pilot Assist  
: From standby mode - activates Pilot  
Assist and sets the current speed  
: From active mode - deactivates/  
puts Pilot Assist in standby mode  
: Activates Pilot Assist from standby  
mode and resumes the set speed and time  
interval  
Passing assistance (p. 313)  
39  
Depending on market, this function can be either standard or optional.  
298  
* Option/accessory.  
 
DRIVER SUPPORT  
your vehicle's current speed must be at  
least 15 km/h (9 mph).  
Instrument panel  
Selecting and activating Pilot  
Assist*40  
Pilot Assist must first be selected and then  
activated before it can regulate speed and  
distance and provide steering assistance.  
1. Press the (1) or (3) button on the  
steering wheel keypad and scroll to the  
Pilot Assist symbol  
(4).  
> Gray symbol – Pilot Assist is in standby  
mode.  
When Pilot Assist is selected, press  
(2) on the steering wheel keypad to acti-  
vate.  
2.  
> White symbol – Pilot Assist starts and  
the current speed is stored as the maxi-  
mum speed.  
Speed indicators.  
Set speed  
Reactivating Pilot Assist to the last  
stored speed  
Speed of the vehicle ahead  
When Pilot Assist is selected, press  
on the steering wheel keypad to activate.  
The current speed of your vehicle  
To start Pilot Assist:  
The driver's seat belt must be buckled and  
the driver's door must be closed.  
Related information  
> The Cruise Control marking in the  
instrument panel will change from  
GRAY to WHITE and the vehicle will  
then return to the most recently set  
speed.  
There must be a vehicle ahead (target  
vehicle) within a reasonable distance or  
WARNING  
A noticeable increase in speed may follow  
when the speed is resumed with the  
steering wheel button.  
40  
Depending on market, this function can be either standard or optional.  
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* Option/accessory. 299  
 
DRIVER SUPPORT  
Deactivating Pilot Assist*41  
Pilot Assist can be deactivated and switched  
||  
WARNING  
Note that the Pilot Assist function only  
works when the driver's hands are on the  
steering wheel.  
With Pilot Assist in standby mode, the  
driver must intervene and steer and  
regulate both speed and distance to  
the vehicle ahead.  
off.  
If the vehicle comes too close to a vehi-  
cle ahead when Pilot Assist is in  
standby mode, the driver is instead  
warned of the short distance by the  
Distance Alert* function.  
Additional markings in the instrument  
panel  
Pilot Assist will only regulate  
the time interval to the vehi-  
cle ahead when the distance  
symbol shows a vehicle (1)  
over the steering wheel sym-  
bol.  
Related information  
Adaptive Cruise Control* (p. 286)  
Pilot Assist's steering assistance is only active  
when the steering wheel symbol (2) changes  
from GRAY to GREEN.  
Selecting and activating Adaptive Cruise  
Control* (p. 289)  
Press the  
wheel (2).  
button on the steering  
1.  
Switching between cruise control and  
Adaptive Cruise Control* in the center dis-  
play (p. 293)  
A speed interval will be  
marked at the same time.  
> The symbol and markings turn gray –  
Pilot Assist goes into standby mode.  
The time interval indicator light and any  
symbols for the target vehicle will go  
out.  
Adaptive Cruise Control* limitations  
(p. 292)  
The higher speed is the  
stored speed for your vehicle  
and the lower speed is the  
speed of the vehicle ahead  
(target vehicle).  
2. Press the (1) or (3) buttons on the  
steering wheel to select another function.  
> The Pilot Assist symbol and marking (4)  
in the instrument panel will go out and  
the stored maximum speed will be  
erased.  
Related information  
41  
Depending on market, this function can be either standard or optional.  
300  
* Option/accessory.  
 
DRIVER SUPPORT  
Pilot Assist*42 standby mode  
Pilot Assist can be deactivated and put in  
standby mode. This may happen automati-  
cally or be due to driver intervention.  
your vehicle's speed goes under 5 km/h  
(3 mph) and the vehicle ahead turns so  
that Pilot Assist no longer has a vehicle to  
follow.  
WARNING  
With automatic standby mode, the driver is  
warned by an acoustic signal and a mes-  
sage on the instrument panel.  
Standby mode means that the function is  
selected in the instrument panel but not acti-  
vated. In standby mode, Pilot Assist will not  
regulate the speed or distance to the vehicle  
ahead or provide steering assistance.  
Related information  
The driver must then regulate vehicle  
speed, apply the brakes if necessary,  
and maintain a safe distance to other  
vehicles.  
Standby mode due to action by the  
driver  
Adaptive Cruise Control may go into standby  
mode if, e.g.:  
Pilot Assist will be deactivated and put in  
standby mode if any of the following occurs:  
the driver opens the door.  
the brake temperature is high.  
The brakes are applied.  
the driver's hands are not on the steering  
wheel.  
The gear selector is moved to N.  
A turn signal is used for more than  
1 minute.  
the parking brake is applied.  
the engine speed (rpm) is too low/high.  
the driver unbuckles the seat belt.  
one or more of the wheels lose traction.  
The vehicle is driven faster than the set  
speed for more than 1 minute.  
Automatic standby mode  
the camera/radar sensor is covered by  
snow or heavy rain (the camera lens/radar  
waves are blocked).  
Pilot Assist is dependent on other systems,  
such as Electronic Stability Control (ESC43). If  
any of these other systems stops working,  
Pilot Assist will be automatically deactivated.  
your vehicle's speed goes under 5 km/h  
(3 mph) and Pilot Assist cannot determine  
if the vehicle ahead is stationary or if it is  
another object, e.g. a speed bump.  
42  
Depending on market, this function can be either standard or optional.  
Electronic Stability Control  
43  
* Option/accessory. 301  
DRIVER SUPPORT  
Pilot Assist*45 limitations  
Pilot Assist functionality may be reduced in  
Temporarily deactivating steering  
WARNING  
assistance with Pilot Assist*44  
In some situations, Pilot Assist may have  
trouble helping the driver properly or may  
be deactivated automatically – we advise  
against using Pilot Assist in such cases.  
Examples of such situations include:  
certain situations.  
Pilot Assist steering assistance can be tem-  
porarily deactivated and reactivated without  
prior warning.  
When the turn signals are used, Pilot Assist's  
steering assistance will be temporarily deacti-  
vated. When the turn signal is switched off,  
steering assistance will be automatically reac-  
tivated if the traffic lane's side markings can  
still be detected.  
Pilot Assist is a driver support function  
designed to simplify driving and assist the  
driver in many situations. However, the driver  
is always responsible for maintaining a suita-  
ble distance to vehicles or objects around it  
and ensuring that the vehicle is correctly posi-  
tioned in the traffic lane.  
the lane markings are worn, missing or  
cross each other.  
lane division is unclear, for example,  
when the lanes divide or merge or at  
exits or when there are multiple sets of  
markings.  
If Pilot Assist cannot clearly interpret the  
lane's side marker lines or if the camera/radar  
sensor is unable for some other reason to  
clearly interpret the lane, Pilot Assist will tem-  
porarily deactivate steering assistance. How-  
ever, the speed and distance warnings will  
remain active. Steering assistance will resume  
when the side marker lines can once again be  
interpreted. In these situations, the driver may  
be alerted through slight vibrations in the  
steering wheel that steering assistance is tem-  
porarily deactivated.  
edges or other lines than lane markings  
are present on or near the road, e.g.  
curbs, joints or repairs to the road sur-  
face, edges of barriers, roadside edges  
or strong shadows.  
the lane is narrow or winding.  
the lane contains ridges or holes.  
weather conditions are poor, e.g. rain,  
snow or fog or slush or reduced visibil-  
ity with poor light conditions, back-  
lighting, wet road surface, etc.  
Related information  
The driver should also note that Pilot Assist  
has the following limitations:  
High curbs, roadside barriers, tempo-  
rary obstacles (traffic cones, safety bar-  
riers, etc.) are not detected. Alterna-  
44  
Depending on market, this function can be either standard or optional.  
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DRIVER SUPPORT  
tively, they may be detected incorrectly  
as lane markings, with a subsequent  
risk of contact between the vehicle and  
such obstacles. The driver is responsi-  
ble for ensuring that the vehicle main-  
tains a suitable distance from such  
obstacles.  
Steep roads and/or heavy loads  
WARNING  
Pilot Assist is primarily intended to be driven  
on flat roads. The function may not be able to  
maintain the correct time interval to the vehi-  
cle ahead when driving down steep hills. The  
driver should be extra attentive and prepared  
to apply the brakes.  
Pilot Assist should only be used if there are  
clear lane lines painted on each side of the  
lane. All other use will increase the risk of  
contact with nearby obstacles that cannot  
be detected by the functions.  
The camera and radar sensors do not  
have the capacity to detect all oncom-  
ing objects and obstacles in traffic  
environments, e.g. potholes, stationary  
obstacles or objects that completely or  
partially block the route.  
Do not use Pilot Assist if the vehicle is carrying  
a heavy load or towing a trailer.  
WARNING  
This is not a collision avoidance sys-  
tem. The driver is always responsible  
and must intervene if the system fails  
to detect a vehicle ahead.  
Pilot Assist cannot be activated if a trailer,  
bike carrier or similar is connected to the  
vehicle electrical system.  
Pilot Assist does not "see" pedestrians,  
animals, etc.  
The function does not brake for people  
or animals and does not brake for small  
vehicles, such as bikes and motorcy-  
cles. Similarly, it does not brake for low  
trailers, oncoming, slow-moving or sta-  
tionary vehicles and objects.  
The recommended steering input is  
limited in force, which means that it  
cannot always help the driver to steer  
and keep the vehicle within the lane.  
Other limitations  
The Off Road drive mode cannot be selected  
when Pilot Assist is activated.  
Do not use the function in demanding  
situations, such as in city traffic, at  
intersections, on slippery surfaces,  
with a lot of water or slush on the road,  
in heavy rain/snow, in poor visibility, on  
winding roads, or on on/off ramps.  
In vehicles equipped with Sensus  
Navigation*, the function is able to use  
information from map data, which  
could cause variations in performance.  
The function uses the vehicle's camera and  
radar sensor, which has certain general  
limitations.  
Pilot Assist will be switched off if the  
speed-dependent power steering  
wheel resistance is working at reduced  
power, e.g. during cooling due to over-  
heating.  
Related information  
The driver can always correct or adjust steer-  
ing assistance provided by Pilot Assist by turn-  
ing the steering wheel to the desired position.  
Camera/radar sensor limitations (p. 318)  
45  
Depending on market, this function can be either standard or optional.  
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* Option/accessory. 303  
DRIVER SUPPORT  
Pilot Assist*46 symbols and  
Speed-dependent steering wheel resis-  
tance (p. 276)  
messages  
Drive modes* (p. 410)  
A number of symbols and messages relating  
to Pilot Assist may be displayed in the instru-  
ment panel and/or the head-up display*.  
In the following illustration, Road Sign Infor-  
mation (RSI47) indicates that the maximum  
permitted speed is 130 km/h (80 mph).  
The previous illustration shows that Pilot  
Assist is set to maintain a speed of 110 km/h  
(68 mph) and is following a target vehicle  
ahead that is traveling at the same speed.  
Pilot Assist will not provide any steering assis-  
tance because it cannot detect the lane's side  
marking lines.  
The previous illustration shows that Pilot  
Assist is set to maintain a speed of 110 km/h  
(68 mph) and that there is no target vehicle  
ahead to follow.  
Pilot Assist will not provide any steering assis-  
tance because it cannot detect the lane's side  
marking lines.  
46  
47  
Depending on market, this function can be either standard or optional.  
Road Sign Information  
304  
* Option/accessory.  
 
DRIVER SUPPORT  
The previous illustration shows that Pilot  
Assist is set to maintain a speed of 110 km/h  
(68 mph) and that there is no target vehicle  
ahead to follow.  
Collision risk warning from driver  
support  
The driver support systems Adaptive Cruise  
Control* and Pilot Assist* can help alert the  
driver if the distance to the vehicle ahead  
suddenly decreases to an unsafe distance.  
Pilot Assist will provide steering assistance  
because it can detect the lane's side marking  
lines.  
Related information  
The previous illustration shows that Pilot  
Assist is set to maintain a speed of 110 km/h  
(68 mph) and is following a target vehicle  
ahead that is traveling at the same speed.  
In this example, Pilot Assist will also provide  
steering assistance because it can detect the  
lane's side marking lines.  
Collision warning audible signal and symbol.  
Acoustic collision warning signal  
Collision warning symbol  
Camera/radar sensor distance monitoring  
Adaptive Cruise Control and Pilot Assist use  
approx. 40% of the braking capacity. If a sit-  
uation requires more braking force than driver  
support can provide, and if the driver does not  
apply the brakes, a warning light and audible  
warning signal will be activated to alert the  
driver that immediate action is required.  
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DRIVER SUPPORT  
||  
Related information  
Switching target vehicles with  
driver support  
At certain speeds, vehicles with automatic  
transmissions and the driver support func-  
tions Adaptive Cruise Control* and Pilot  
Assist* can switch target vehicles.  
WARNING  
Driver support systems (p. 276)  
The driver support system only issues a  
warning for vehicles detected by its radar  
unit – thus, a warning may come after a  
delay or not at all. Never wait for a warning.  
Apply the brakes when necessary.  
Adaptive Cruise Control* (p. 286)  
Distance Alert* (p. 281)  
Head-up display* (p. 143)  
Switching target vehicles  
If the target vehicle ahead turns suddenly, there may  
be stationary traffic ahead.  
When driver support is actively following  
another vehicle at speeds under 30 km/h  
(20 mph) and switches targets from a moving  
vehicle to a stationary vehicle, driver support  
will brake for the stationary vehicle.  
Collision warning symbol on the windshield.  
In vehicles equipped with a head-up display*,  
a flashing warning symbol will be displayed on  
the windshield.  
Visual warnings on the windshield may be  
difficult to notice in cases of strong sun-  
light, reflections, extreme light contrasts,  
or if the driver is wearing sunglasses or is  
not looking straight ahead.  
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* Option/accessory.  
 
DRIVER SUPPORT  
Adjusting set speed for driver  
support  
It is possible to adjust set speeds for the  
Adaptive Cruise Control* and Pilot Assist*  
functions.  
Change a set speed by pressing the  
(1) or (2) buttons briefly or by pressing  
and holding them:  
WARNING  
When driver support follows another vehi-  
cle at speeds over approx. 30 km/h  
(20 mph) and changes target vehicle –  
from a moving vehicle to a stationary one –  
driver support will ignore the stationary  
vehicle and instead accelerate to the stored  
speed.  
Brief press: Each press changes the  
speed in +/- 5 km/h (+/- 5 mph) incre-  
ments.  
Press and hold: Release the button  
when the set speed indicator (3) has  
moved to the desired speed.  
The driver must then intervene and  
apply the brakes.  
Automatic standby mode when switching  
targets  
Driver support disengages and goes into  
standby mode if:  
For vehicles without Adaptive Cruise Con-  
trol*, speed instead increases by +/- 1km/h  
(+/- 1 mph) each time the button is  
pressed.  
your vehicle's speed goes under 5 km/h  
(3 mph) and driver support cannot deter-  
mine if the target vehicle is stationary or if  
it is another object, e.g. a speed bump.  
: Increases the set speed.  
The most recently set speed will be  
stored.  
: Reduces the set speed.  
Set speed.  
If speed is increased by depressing the accel-  
erator pedal while pressing the (1) button  
on the steering wheel, the vehicle's speed  
when the button is pressed will be stored as  
the set speed.  
your vehicle's speed goes under 5 km/h  
(3 mph) and the vehicle ahead turns so  
that driver support no longer has a vehicle  
to follow.  
Related information  
Temporarily increasing speed using the accel-  
erator pedal, e.g. when passing another vehi-  
cle, will not affect the setting. The vehicle will  
return to the set speed when the accelerator  
pedal is released.  
Driver support systems (p. 276)  
Adaptive Cruise Control* (p. 286)  
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DRIVER SUPPORT  
||  
Automatic transmission  
Setting time interval to the vehicle  
ahead  
The time interval to the vehicle ahead can be  
set for the functions Adaptive Cruise Control*,  
Pilot Assist* and Distance Alert*.  
Different time intervals to the  
The driver support functions can follow  
another vehicle at speeds from a standstill up  
to 200 km/h (125 mph).  
When the symbol in the instrument panel  
shows two vehicles, ACC is following the  
vehicle ahead at a preset time interval.  
Pilot Assist can provide steering assistance  
from near-stationary speeds up to 140 km/h  
(87 mph).  
When only one vehicle is shown, there is  
no vehicle ahead within a reasonable dis-  
tance.  
vehicle ahead can be selected  
and are shown in the instru-  
The lowest speed that can be set is 30 km/h  
(20 mph). When following another vehicle,  
ACC can monitor that vehicle's speed and  
slow your own vehicle down to a standstill,  
but it is not possible to set speeds lower than  
30 km/h (20 mph).  
ment panel as 15 horizontal  
bars. The more bars, the  
longer the time interval. One  
bar represents an interval of  
approx. 1 second to the vehicle ahead. 5 bars  
represents approx. 3 seconds.  
Related information  
Driver support systems (p. 276)  
When the symbol in the instrument panel  
shows a vehicle and a steering wheel, Pilot  
Assist follows a vehicle ahead at a preset  
time interval.  
Cruise control (p. 283)  
Adaptive Cruise Control* (p. 286)  
When only a steering wheel is shown,  
there is no vehicle ahead within a reasona-  
ble distance.  
Controls for setting a time interval.  
Reduce the time interval  
Increase the time interval  
Distance indicator  
Press the (1) or (2) button to decrease or  
increase the time interval.  
> The distance indicator (3) shows the  
current time interval.  
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DRIVER SUPPORT  
In order to help your vehicle follow the vehicle  
ahead as smoothly and comfortably as possi-  
ble, Adaptive Cruise Control allows the time  
interval to vary noticeably in certain situations.  
At low speeds, when the distance to the vehi-  
cle ahead is short, Adaptive Cruise Control  
increases the time interval slightly.  
Related information  
Auto-hold braking with driver  
Driver support systems (p. 276)  
support  
The driver support functions Adaptive Cruise  
Control* and Pilot Assist* have a special brake  
function in slow traffic and while stationary.  
Adaptive Cruise Control* (p. 286)  
Distance Alert* (p. 281)  
Braking function in slow traffic and at  
a standstill  
Head-up display* (p. 143)  
In slow-moving, stop-and-go traffic or when  
stopped at a traffic light, driving will resume  
automatically if the vehicle is stopped for less  
than approx. 3 seconds. If it takes more than 3  
seconds for the vehicle ahead to begin moving  
again, the driver support function will go into  
standby mode and the auto-hold brake func-  
tion will activate.  
The greater the vehicles' speed, the  
greater the distance between them for  
a set time interval.  
Only use the time intervals permitted  
by local traffic regulations.  
If driver support does not seem to  
respond with a speed increase when  
activated, it may be because the time  
interval to the vehicle ahead is shorter  
than the set time interval.  
The function can be reactivated by:  
Pressing the  
button on the steer-  
ing wheel keypad.  
Pressing the accelerator pedal.  
> The function will resume following the  
vehicle ahead if it begins to move  
within approx. 6 seconds.  
WARNING  
Only use a time interval suitable for the  
current traffic conditions.  
The driver should be aware that short  
time intervals give them limited time to  
react and act to any unforeseen traffic  
situation.  
WARNING  
A noticeable increase in speed may follow  
when the speed is resumed with the  
steering wheel button.  
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