Volvo V70 (2016 year). Manual — part 13
07 Driver support
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Option/accessory, for more information, see Introduction.
221
The same symbol is also shown when Adap-
tive cruise control (p. 206) is activated.
The higher the speed the longer the calcu-
lated distance in metres for a given time
interval.
The set time interval is also used by the
function adaptive cruise control (p. 206).
Only use the time intervals permitted by
local traffic regulations.
Related information
•
Distance Warning* - limitations (p. 221)
•
Distance Warning* - symbols and mes-
Distance Warning* - limitations
This function, which uses the same radar
sensor as Adaptive cruise control (p. 205) and
Collision warning with auto brake (p. 230),
has certain limitations.
Strong sunlight, reflections or strong varia-
tions in light intensity, as well as wearing
sunglasses, could mean that the warning
light in the windscreen cannot be seen.
Poor weather or winding roads could
affect the radar sensor's capacity to detect
vehicles in front.
The size of other vehicles could also affect
detection capacity, e.g. motorcycles. This
could mean that the warning lamp illumi-
nates at a shorter distance than the setting
or that the warning is temporarily absent.
Extremely high speeds can also cause the
lamp to illuminate at a shorter distance
than that set due to limitations in sensor
range.
For further information on radar sensor limita-
tions, see Radar sensor - limitations (p. 215)
Related information
•
•
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*
Option/accessory, for more information, see Introduction.
Distance Warning* - symbols and
messages
The function has certain symbols and mes-
sages that can be shown in the combined
instrument panel if the function is reduced
due to its limitations.
Symbol
A
Message
Specification
Radar blocked See
manual
Distance Warning temporarily disengaged.
The radar sensor is blocked and cannot detect other vehicles, e.g. in the event of heavy rain or if slush
has collected in front of the radar sensor.
Read about radar sensor limitations (p. 215).
Collision warning
Service required
Distance Warning and Collision Warning with Auto Brake fully or partially disengaged.
Visit a workshop if the message remains - an authorised Volvo workshop is recommended.
A
Symbols are schematic - may vary by market and car model.
Related information
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•
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City Safety™
City Safety™ is a function for helping the
driver to avoid a collision when driving in
queues, amongst other things, when changes
in the traffic ahead, combined with a lapse in
attention, could lead to an incident.
The City Safety™ function is active at speeds
under 50 km/h and it helps the driver by auto-
matically braking the car in the event of immi-
nent risk of collision with vehicles in front,
should the driver not react in time by braking
and/or steering away.
City Safety™ is activated in situations where
the driver should have started braking earlier,
which is why it cannot help the driver in every
situation.
City Safety™ is designed to be activated as
late as possible in order to avoid unnecessary
intervention.
City Safety™ must not be used as an excuse
for the driver to change his/her driving style. If
the driver solely relies on City Safety™ to do
the braking, there will be a collision sooner or
later.
The driver or passengers normally only notice
City Safety™ if a situation arises where the
car is extremely close to being in a collision.
If the car is also equipped with Collision
Warning with Auto Brake (p. 230)* these two
systems complement each other.
Maintenance and replacement of City
Safety™ components must only be per-
formed by a workshop - an authorised
Volvo workshop is recommended.
WARNING
City Safety™ does not engage in all driv-
ing situations or traffic, weather or road
conditions.
City Safety™ does not react to vehicles
driving in a different direction from the car,
to small vehicles and motorcycles or to
humans and animals.
City Safety™ can prevent collision at a
speed difference of less than 15 km/h - at
a higher speed difference, it is only possi-
ble to reduce collision speed. In order to
obtain full brake function, the driver must
depress the brake pedal.
Never wait for City Safety™ to engage.
The driver always bears responsibility for
maintaining the proper distance and
speed.
Related information
•
City Safety™ - limitations (p. 225)
•
City Safety™ - function (p. 223)
•
City Safety™ - operation (p. 224)
•
City Safety™ - laser sensor (p. 227)
•
City Safety™ - symbols and messages
City Safety™ - function
City Safety detects the traffic in front of the
car with a laser sensor fitted in the top edge
of the windscreen. If there is an imminent risk
of collision, City Safety will automatically
brake the car, which may be experienced as
heavy braking.
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224
Laser sensor transmitter and receiver window
13
.
If the speed difference is 4-15 km/h in relation
to the vehicle in front then City Safety can
completely avoid a collision.
City Safety activates a short, sharp braking
procedure and stops the car in normal cir-
cumstances, just behind the vehicle in front.
For most drivers this is well outside normal
driving style and may be experienced as
being uncomfortable.
If the difference in speed between the vehi-
cles is greater than 15 km/h then City Safety
may not avoid the collision on its own - to
obtain full brake force, the driver must
depress the brake pedal and this could then
make it possible to avoid a collision, even at
speed differences above 15 km/h.
When the function is activated and brakes,
the combined instrument panel shows a text
message to the effect that the function is/has
been active.
When City Safety™ brakes, the brake
lights come on.
Related information
•
City Safety™ - limitations (p. 225)
•
•
City Safety™ - operation (p. 224)
•
City Safety™ - laser sensor (p. 227)
•
City Safety™ - symbols and messages
City Safety™ - operation
City Safety™ is a function for helping the
driver to avoid a collision when driving in
queues, amongst other things, when changes
in the traffic ahead, combined with a lapse in
attention, could lead to an incident.
On and Off
The City Safety™ function is activated
automatically when the engine is started.
In certain situations, it may advisable to disa-
ble City Safety™, e.g. where leafy branches
could sweep over the bonnet and/or wind-
screen.
City Safety™ handled in the menu system
MY CAR (p. 116) and after starting the engine
the function can be deactivated as follows:
•
Search in MY CAR for
Driver support
system
and select the
Off
option at
City
Safety
.
However, the function will be enabled the
next time the engine is started, regardless
of whether the system was enabled or
disabled when the engine was switched
off.
13
NOTE: The illustration is schematic - details may vary depending on car model.
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WARNING
The laser sensor also transmits laser light
when City Safety™ is disabled manually.
Related information
•
•
City Safety™ - limitations (p. 225)
•
City Safety™ - function (p. 223)
•
City Safety™ - laser sensor (p. 227)
•
City Safety™ - symbols and messages
•
City Safety™ - limitations
The sensor in City Safety is designed to
detect cars and other large vehicles in front of
the car irrespective of whether it is day or
night.
However, the function does have some limita-
tions.
The sensor's limitations mean that City Safety
has poorer functionality - or none at all - in
e.g. heavy snowfall or rain, dense fog, dust
storms or white-out situations. Misting, dirt,
ice or snow on the windscreen may also dis-
rupt the function.
Low-hanging objects, e.g. a flag/pennant for
projecting load, or accessories such as auxili-
ary lamps and bull bars that are higher than
the bonnet limit the function.
The laser beam from the sensor in City Safety
measures how the light is reflected. The sen-
sor cannot detect objects with low reflection
capacity. The rear sections of the vehicle
generally reflect the light sufficiently thanks to
the number plate and rear light reflectors.
On slippery road surfaces the braking dis-
tance is extended, which may reduce the
capacity of City Safety to avoid a collision. In
such situations the ABS
14
and ESC
15
systems
will provide best possible braking force with
maintained stability.
When your own car is reversing, City Safety is
temporarily deactivated.
City Safety is not activated at low speeds -
under 4 km/h, which is why the system does
not intervene in situations where a vehicle in
front is being approached very slowly, e.g.
when parking.
Driver commands are always prioritised,
which is why City Safety does not intervene in
situations where the driver is steering or
accelerating in a clear manner, even if a colli-
sion is unavoidable.
When City Safety has prevented a collision
with a stationary object the car remains sta-
tionary for a maximum of 1.5 seconds. If the
car is braked for a vehicle in front that is mov-
ing, then speed is reduced to the same speed
as that maintained by the vehicle in front.
On a car with manual gearbox the engine
stops when City Safety has stopped the car,
unless the driver manages to depress the
clutch pedal beforehand.
14
(Anti-lock Braking System) - Anti-lock braking system.
15
(Electronic Stability Control) - Stability system.
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•
Keep the windscreen surface in front
of the laser sensor free from ice, snow
and dirt (see the illustration for sensor
•
Do not affix or mount anything on the
windscreen in front of the laser sensor.
•
Remove ice and snow from the bonnet
- snow and ice must not exceed a
height of 5 cm.
Fault tracing and action
If the message
Windscreen sensors
blocked See manual
is shown in the com-
bined instrument panel it indicates that the
laser sensor is blocked and cannot detect
vehicles in front of the car. This means in turn
that City Safety is not operational.
The
Windscreen sensors blocked See
manual
message is not shown for all situa-
tions in which the laser sensor is blocked.
The driver must therefore be diligent about
keeping the windscreen and area in front of
the laser sensor clean.
The following table presents possible causes
for the message being shown, along with
suggestions for appropriate action.
Cause
Action
The windscreen sur-
face in front of the
laser sensor is dirty or
covered with ice or
snow.
Clean the wind-
screen surface in
front of the sensor
from dirt, ice and
snow.
The laser sensor field
of vision is blocked.
Remove the
blocking object.
If there are cracks, scratches or stone
chips in the windscreen in front of either of
the laser sensor's "windows" and they
cover a surface of approx. 0.5 x 3.0 mm
(or larger), then a workshop must be con-
tacted for replacement of the windscreen
(see the illustration for sensor location
(p. 223)) - an authorised Volvo workshop is
recommended.
Failure to take action may result in
reduced performance for City Safety™.
To avoid the risk of failed, deficient or
reduced operation for City Safety™, the
following also applies:
•
Volvo recommends that you do not
repair cracks, scratches or stone chips
in the area in front of the laser sensor -
instead, the whole windscreen should
be replaced.
•
Before replacing a windscreen, con-
tact an authorised Volvo workshop to
verify that the correct windscreen is
ordered and fitted.
•
The same type or Volvo-approved
windscreen wipers must be fitted dur-
ing replacement.
Related information
•
•
City Safety™ - function (p. 223)
•
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City Safety™ - laser sensor
The City Safety™ function includes a sensor
which transmits laser light (see illustration
(p. 223) for sensor location). Contact a quali-
fied workshop in the event of a fault or if the
laser sensor needs servicing - an authorised
Volvo workshop is recommended. It is abso-
lutely essential to follow the prescribed
instructions when handling the laser sensor.
The following two labels relate to the laser
sensor:
The upper label in the figure describes the
laser beam's classification:
•
Laser radiation - Do not look into the
laser beam with optical instruments -
Class 1M laser product.
The lower label in the figure describes the
laser beam's physical data:
•
IEC 60825-1:1993 + A2:2001. Complies
with FDA (U.S. Food Administration)
standards for laser product design with
the exception of deviations in accordance
with "Laser Notice No. 50" from
26 July 2001.
Radiation data for the laser sensor
The following table specifies the laser sen-
sor's physical data.
Maximum pulse energy
2.64
µJ
Maximum average output
45 mW
Pulse duration
33 ns
Divergence (horizontal x verti-
cal)
28° × 12°
WARNING
If any of these instructions are not followed
then there is a risk of eye injury!
•
Never look into the laser sensor (which
emits spreading invisible laser radia-
tion) at a distance of 100 mm or closer
with magnifying optics such as a mag-
nifying glass, microscope, lens or simi-
lar optical instruments.
•
Testing, repair, removal, adjustment
and/or replacement of the laser sen-
sor's spare parts must only be carried
out by a qualified workshop - we rec-
ommend an authorised Volvo work-
shop.
•
To avoid exposure to harmful radia-
tion, do not carry out any readjust-
ments or maintenance other than
those specified here.
•
The repairer must follow specially
drawn up workshop information for the
laser sensor.
•
Do not remove the laser sensor (this
includes removing the lenses). A
removed laser sensor does not fulfil
laser class 3B as per standard IEC
60825-1. Laser class 3B is not eye-
safe and therefore entails a risk of
injury.
•
The laser sensor's connector must be
unplugged before removal from the
windscreen.
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•
The laser sensor must be fitted onto
the windscreen before the sensor's
connector is plugged in.
•
The laser sensor transmits a laser light
when the remote control key is in key
position II (p. 81) even if the engine is
switched off.
Related information
•
•
City Safety™ - limitations (p. 225)
•
City Safety™ - function (p. 223)
•
City Safety™ - operation (p. 224)
•
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City Safety™ - symbols and
messages
In conjunction with automatic braking by the
City Safety™ (p. 223) system, one or more
symbols may illuminate in the combined
instrument panel and a text message may be
shown. A text message can be acknowledged
by briefly pressing the OK button on the
direction indicator stalk.
Symbol Message
Meaning/Action
Auto braking by City Safety
City Safety™ is braking or has automatically braked.
Windscreen sensors blocked
See manual
The laser sensor is temporarily non-operational because something is blocking it.
•
Remove the object blocking the sensor and/or clean the windscreen in front of the sensor.
Read about laser sensor limitations (p. 225).
City Safety Service required
City Safety™ is not operational.
•
Visit a workshop if the message remains - an authorised Volvo workshop is recommended.
Related information
•
•
City Safety™ - limitations (p. 225)
•
City Safety™ - function (p. 223)
•
City Safety™ - operation (p. 224)
•
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Option/accessory, for more information, see Introduction.
Collision warning system*
16
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" is an aid to
assist the driver when there is a risk of collid-
ing with a pedestrian, cyclist or vehicle in
front that are stationary or moving in the same
direction.
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" is activated
in situations where the driver should have
started braking earlier, which is why it cannot
help the driver in every situation.
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" is designed
to be activated as late as possible in order to
avoid unnecessary intervention.
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" can pre-
vent a collision or reduce collision speed.
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" must not
be used as an excuse for the driver to change
his/her driving style. If the driver solely relies
on Collision Warning with Auto Brake to do
the braking, there might be a risk of a colli-
sion sooner or later.
Two system levels
Depending on how the car is equipped, the
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" function
may appear in two variants:
Level 1
The driver is merely warned
17
of occurring
obstacles by means of visual and acoustic
signals - no automatic braking intervenes, the
driver must himself brake.
Level 2
The driver is warned of occurring obstacles
by means of visual and acoustic signals - the
car is braked automatically if the driver him-
self does not act within a reasonable time.
Maintenance of the internal components of
the "Collision Warning with Auto Brake
and Cyclist and Pedestrian Detection"
must only be performed at a workshop -
an authorised Volvo workshop is recom-
mended.
Related information
•
Collision warning system* - function
•
Collision warning system* - detection of
•
Collision warning system* - detection of
•
Collision warning system* - operation
•
Collision warning system* - limitations
•
Collision warning system* - camera sen-
•
Collision warning system* - symbols and
16
Not available as an option for certain engines.
17
No warning for cyclists with "Level 1".
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Option/accessory, for more information, see Introduction.
231
Collision warning system* - function
Function overview
18
.
Audio-visual warning signal in the event
of a collision risk.
Radar sensor
19
Camera sensor
Collision Warning with Auto Brake executes
three steps in the following order:
1. Collision warning
2. Brake support
19
3. Auto Brake
19
The collision warning system and City
Safety™ (p. 223) complement each other.
1 - Collision warning
The driver is first warned of a potentially
imminent collision.
The collision warning system can detect
pedestrians, cyclists or vehicles that are sta-
tionary or moving in the same direction in
front of the driver's vehicle.
If there is a risk of collision with a pedestrian,
cyclist or a vehicle then the driver's attention
is attracted with a flashing red warning signal
(1) and an acoustic signal.
2 - Brake support
19
If the risk of collision has increased further
after the collision warning then the brake sup-
port is activated.
This means that the brake system is prepared
for rapid braking by applying the brakes
lightly, which may feel like a slight jolt.
If the brake pedal is depressed sufficiently
quickly then full brake function is imple-
mented.
Brake support also reinforces the driver's
braking if the system considers that the brak-
ing is not sufficient to avoid a collision.
3 - Auto Brake
19
The automatic brake function is activated
last.
If in this situation the driver has not yet
started to take evasive action and the risk of
collision is imminent then the automatic brak-
ing function is deployed - this takes place
irrespective of whether or not the driver
brakes. Braking then takes place with full
brake force in order to reduce collision speed,
or with limited brake force if it is sufficient to
avoid a collision. For cyclists, the warning and
full brake intervention may come very late or
simultaneously.
18
NOTE: The illustration is schematic - details may vary depending on car model.
19
With system Level 2 only.
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Option/accessory, for more information, see Introduction.
WARNING
The collision warning system does not
engage in all driving situations or traffic,
weather or road conditions. The collision
warning system does not react to vehicles
or cyclists driving in another direction to
the car or to animals.
Warning only activated in the event of a
high risk for collision. This section "Func-
tion" and the section "Limitations" inform
about limitations that the driver must be
aware of before using the Collision Warn-
ing system with Auto Brake.
Warnings and brake interventions for
pedestrians and cyclists are deactivated at
a vehicle speed exceeding 80 km/h.
Warnings and brake interventions for
pedestrians and cyclists do not work in
darkness and tunnels - not even when
streetlights are lit.
The auto-brake function can prevent a col-
lision or reduce collision speed. To ensure
full brake performance, the driver should
always depress the brake pedal - even
when the car auto-brakes.
Never wait for a collision warning. The
driver is always responsible that the cor-
rect distance and speed are maintained -
even when the collision warning system
with auto-brake is used.
Related information
•
Collision warning system* (p. 230)
Collision warning system* - detection
of cyclists
The function only "sees" cyclists from behind,
who are travelling in the same direction.
Optimum examples of what the system interprets
as a cyclist - with clear body and bicycle con-
tours, directly from behind and in the car's cen-
tre line.
Optimal performance of the system requires
that the system function that detects a cyclist
receives as unambiguous information as pos-
sible about the body and bicycle contours -
this implies the opportunity to identify the
bicycle, head, arms, shoulders, legs, upper
and lower body combined with a normal
human pattern of movement.
If large parts of the cyclist's body or bicycle
are not visible to the function's camera then
the system cannot detect a cyclist.
•
For the function to be able to detect a
cyclist, he/she must be an adult and rid-
ing an "adult bicycle".
•
The bicycle must be equipped with a
highly visible and approved
21
rearward-
facing red reflector, fitted at least 70 cm
above the roadway.
•
The function can only detect cyclists
directly from behind and who are travel-
ling in the same direction - not at an
angle from behind, not from the side.
•
Cyclists travelling on the left or right-hand
edge of the car's imagined/extended side
lines may be detected late or not at all.
•
The function's capacity to detect cyclists
at dusk and dawn is limited - just like the
human eye.
21
The reflector must fulfil the recommendations and conditions of the traffic authority in the market in question.
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Option/accessory, for more information, see Introduction.
233
•
The function's capacity to detect cyclists
is deactivated when driving in darkness
and tunnels - even when streetlights are
lit.
•
For optimum bicycle detection, the City
Safety™ function must be activated, see
WARNING
Collision Warning with Auto Brake &
Cyclist Detection is a means of assistance.
The function cannot detect:
•
all cyclists in all situations and does
not see partially obscured cyclists, for
example.
•
cyclists in clothing that obscures the
contours of the body or who are
approaching from the side.
•
bicycles that have no rearward-facing
red reflector.
•
bicycles loaded with large objects.
The driver is always responsible that the
vehicle is driven properly and with a safety
distance adapted to the speed.
Related information
•
Collision warning system* (p. 230)
Collision warning system* - detection
of pedestrians
Optimal examples of what the system regards as
pedestrians with clear body contours.
Optimal performance of the system requires
that the system function that detects pedes-
trians receives as unambiguous information
as possible about the contours of the body -
this implies the opportunity to identify the
head, arms, shoulders, legs, upper and lower
body combined with a normal human pattern
of movement.
If large parts of the body are not visible to the
function's camera then the system cannot
detect a pedestrian.
•
In order for a pedestrian to be detected
he/she must appear full-length and have
a height of at least 80 cm.
•
The camera sensor's ability to see pedes-
trians at dusk and dawn is limited - just
like the human eye.
•
The camera sensor's capacity to detect
pedestrians is deactivated when driving in
darkness and tunnels - even when street-
lights are lit.
WARNING
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" is a
means of assistance. The function cannot
detect all pedestrians in all situations and
does not see, for example:
•
partially obscured pedestrians, people
in clothing that hides their body con-
tour or pedestrians shorter than
80 cm.
•
pedestrians who are carrying larger
objects.
The driver is always responsible that the
vehicle is driven properly and with a safety
distance adapted to the speed.
Related information
•
07 Driver support
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*
Option/accessory, for more information, see Introduction.
Collision warning system* - operation
Warning signals On and Off
1. Acoustic and visual warning signal in the event
of a collision risk.
24
You can select whether the collision warning
system's acoustic and visual warning signals
should be switched on or off.
When starting the engine, the setting that was
selected when the engine was switched off is
obtained automatically.
The Brake Support and Auto Brake func-
tions are always enabled - they cannot be
deactivated.
Settings for the collision warning system are
made via the centre console's screen and the
menu system MY CAR, see (p. 116).
Light and acoustic signals
When the collision warning system's light and
acoustic warnings are activated, the warning
lamp (no. [1] in previous illustration) is tested
each time the engine is started by briefly illu-
minating the warning lamp's separate points
of light.
After starting the engine, both the light and
acoustic signals can be switched off:
•
Search for
Collision warning
in
Driver
support system
in the menu system MY
CAR (p. 116) - and there select to
uncheck the function.
Acoustic signal
After starting the engine the warning sound
can be activated/deactivated separately:
•
Search for
Warning sound
in
Collision
warning
in the menu system MY CAR
(p. 116) - and there select On or Off.
Following which, the collision warning system
is only indicated with a light signal.
Set warning distance
The warning distance regulates the distance
at which the visual and acoustic warnings are
deployed.
•
Search for
Warning distance
in
Collision warning
in the menu system
MY CAR (p. 116) - and there select
Long
,
Normal
or
Short
.
The warning distance determines the sys-
tem's sensitivity. Warning distance
Long
pro-
vides an earlier warning. First test with
Long
and if this setting produces too many warn-
ings, which could be perceived as irritating in
certain situations, then change to warning
distance
Normal
.
Only use warning distance
Short
in excep-
tional cases, e.g. for dynamic driving.
When the adaptive cruise control is in use
the warning lamp and warning sound will
be used by the cruise control even if the
collision warning system is switched off.
The collision warning system warns the
driver in the event of a risk of a collision,
but the function cannot shorten driver
reaction time.
In order for the collision warning system to
be effective, always drive with Distance
Warning (p. 220) set at time interval 4–5.
24
The illustration is schematic - car model and details may differ.
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Option/accessory, for more information, see Introduction.
235
Even if the warning distance has been set
to
Long
warnings could be perceived as
being late in certain situations, e.g. when
there are large differences in speed or if
vehicles in front brake heavily.
WARNING
No automatic system can guarantee
100 % correct function in all situations.
Therefore, never test Collision Warning
with Auto Brake by driving at people or
vehicles - this may cause severe damage
and injury and risk lives.
Checking settings
The current settings can be controlled via the
centre console's screen and the menu sys-
tem (p. 116) MY CAR.
Maintenance
Camera and radar sensor
25
.
For the sensors to work correctly, they must
be kept clear of dirt, ice and snow, and be
cleaned regularly with water and car sham-
poo.
Dirt, ice and snow covering the sensors
will reduce their function and may prevent
measurement.
Related information
•
Collision warning system* (p. 230)
Collision warning system* - limitations
The function has certain limitations - for
example, it is not active until approx. 4 km/h.
The collision warning system's visual warning
signal (see (1) in the illustration (p. 231)) may
be difficult to notice in the event of strong
sunlight, reflections, when sunglasses are
being worn or if the driver is not looking
straight ahead. The warning sound should
therefore always be activated.
On slippery road surfaces the braking dis-
tance is extended, which may reduce the
capacity to avoid a collision. In such situa-
tions the ABS and ESC (p. 196) systems will
provide best possible braking force with
maintained stability.
The visual warning signal can be temporar-
ily disengaged in the event of high passen-
ger compartment temperature caused by
strong sunlight for example. If this occurs
then the warning sound is activated even if
it is deactivated in the menu system.
•
Warnings may not appear if the dis-
tance to the vehicle in front is small or
if steering wheel and pedal move-
ments are large, e.g. a very active driv-
ing style.
25
NOTE: The illustration is schematic - details may vary depending on car model.
||
07 Driver support
07
236
*
Option/accessory, for more information, see Introduction.
WARNING
Warnings and brake interventions could be
implemented late or not at all if the traffic
situation or external influences mean that
the radar or camera sensor cannot detect
a pedestrian, a vehicle or a cyclist in front
correctly.
The sensor system has a limited range for
pedestrians and cyclists
27
- the system
can provide effective warnings and brake
interventions for them at vehicle speeds up
to 50 km/h. For stationary or slow-moving
vehicles, warnings and brake interventions
are effective at vehicle speeds up to
70 km/h.
Warnings for stationary or slow-moving
vehicles could be disengaged due to dark-
ness or poor visibility.
Warnings and brake interventions for
pedestrians and cyclists are deactivated at
vehicle speeds exceeding 80 km/h.
The collision warning system uses the same
radar sensors as the Adaptive cruise control
(p. 205). Read more about radar sensor limi-
tations (p. 215).
If warnings are perceived as being too fre-
quent or disturbing then the warning distance
can be reduced (p. 234). This would lead to
the system warning at a later stage, which
reduces the total number of warnings.
Collision Warning with Auto Brake is tempo-
rarily deactivated with reverse gear engaged.
Collision Warning with Auto Brake is not acti-
vated at low speeds - under 4 km/h, which is
why the system does not intervene in situa-
tions where the car is approaching a vehicle
in front very slowly, e.g. when parking.
In situations where the driver demonstrates
active, aware driving behaviour, a collision
warning may be postponed slightly in order to
keep unnecessary warnings to a minimum.
When Auto Brake has prevented a collision
with a stationary object the car remains sta-
tionary for a maximum of 1.5 seconds. If the
car is braked for a vehicle in front that is mov-
ing, then speed is reduced to the same speed
as that maintained by the vehicle in front.
On a car with manual gearbox the engine
stops when Auto Brake has stopped the car,
unless the driver manages to depress the
clutch pedal beforehand.
Related information
•
Collision warning system* (p. 230)
Collision warning system* - camera
sensor limitations
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" is an aid to
assist the driver when there is a risk of collid-
ing with a pedestrian, bicycle or vehicle in
front that are stationary or moving in the same
direction.
The function uses the car's camera sensor,
which has certain limitations.
The car’s camera sensor is also used - as
well as by Collision Warning with Auto Brake
- by the functions:
•
•
Road sign information (p. 200)
•
Driver Alert Control - DAC (p. 240)
•
Keep the windscreen surface in front of the
camera sensor free from ice, snow, mist
and dirt.
Do not stick or attach anything to the
windscreen in front of the camera sensor
as this may reduce effectiveness or cause
one or more of the systems dependent on
the camera to stop working.
27
For cyclists, the warning and full brake intervention may come very late or simultaneously.
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