2012 VOLVO XC70 brakes

04 Comfort and driving pleasure
Adaptive Cruise Control (ACC)*
04

* Option/accessory, for more information, see Introduction.155
WARNING
Adaptive Cruise Control only warns of vehi-
cles detected by the radar sensor, see
page 158. In some cases there may be no
warning or the warning may be delayed. The
driver should always apply the brakes when
necessary.
Steep inclines and/or heavy loadsACC is primarily intended for use on fairly level
roads. The system may have difficulty main-
taining the correct distance to a vehicle ahead
on steep inclines, if the vehicle is carrying a
heavy load or is towing a trailer. In these situa-
tions, the driver should always be prepared to
apply the brakes if necessary.
Operation
Controls and display
Resume previous settings, increase speed
(each additional press increases speed by
1 mph (approximately 2 km/h).
Standby mode on/off
Set time interval
Put in active mode and set a speed
Set speed (parentheses indicate standby
mode)
Time interval while it is being set
Time interval after it has been set
Putting ACC in standby modeBefore ACC can be used to regulate speed
and/or the distance to a vehicle ahead, it must
first be put in standby mode.
To do so:
Press
.
The
symbol appears in the display and
parentheses (---) indicate that ACC is in
standby mode.
NOTE
The driver's door must be closed and the
driver's seat belt must be fastened before
ACC can be put in active mode. If the driv-
er's seat belt is taken off or if the driver's
door is opened, ACC will return to standby
mode.
Setting a speedOnce ACC has been put in standby mode, use
the
or buttons to store (set) the vehicle's
current speed. This puts the system in active
mode. The set speed, for example 55 mph, is
shown in the display.

04 Comfort and driving pleasure
Adaptive Cruise Control (ACC)*
04

* Option/accessory, for more information, see Introduction.157
Standby mode due to action by the driverACC is temporarily deactivated and put in
standby mode:
•when the brakes are applied
•if the driver's seat belt is taken off
•If the driver's door is opened
•if the gear selector is moved to N
•if the accelerator pedal is depressed for
more than 1 minute.
NOTE
If the accelerator pedal is only depressed for
a short time, such as when passing another
vehicle, ACC is deactivated temporarily and
is reactivated when the pedal is released.
Automatic standby modeAdaptive cruise control is linked to other sys-
tems such as the stability and traction control
system (DSTC). If this system is not functioning
properly, adaptive cruise control is automati-
cally deactivated and will go into standby
mode.
In the event of automatic deactivation, an audi-
ble signal will sound and the message
Cruise
control Cancelled is shown in the display.
The driver must then intervene and adapt the
vehicle's speed to the surrounding traffic and
regulate the distance to the vehicle ahead.An automatic switch to standby mode may be
caused if:
•the wheels lose traction
•brake temperature is high
•the radar sensor is obstructed by, for
example, wet snow or rain.
Queue Assist*The following functions are linked to your vehi-
cle's automatic transmission and comprise the
Queue Assist feature.
Please note that the lowest speed that can be
set is 18 mph (30 km/h), although ACC can
maintain a set speed/distance to a vehicle
ahead down to a standstill. Queue Assist con-
sists of the following features:
Enhanced speed intervalYour vehicle can maintain the set time interval
to the vehicle ahead at any permissible speed,
including a complete stop.
In order to activate ACC at speeds below
18 mph (30 km/h):
•The vehicle ahead must be within a rea-
sonable distance (not farther away than
approx. 100 ft/30 meters)
•The lowest speed that can be selected is
18 mph (30 km/h), although ACC will also
help maintain the set time interval to thevehicle ahead at lower speeds, including a
complete stop.
During short stops (less than approximately
3 seconds) in slow-moving traffic, your vehicle
will begin moving again automatically as soon
as the vehicle ahead begins to move.
If it takes more than 3 seconds for the vehicle
ahead to begin moving, ACC will be automati-
cally go into standby mode.
The driver will then have to reactivate ACC in
one of the following ways:
•By pressing
•By accelerating up to at least 3 mph
(4 km/h)
Your vehicle will then resume following the
vehicle ahead at the set time interval.
NOTE
ACC can remain active and keep your vehi-
cle at a standstill for up to 2 minutes. After
2 minutes have elapsed, the parking brake
will be engaged and ACC will go into
standby mode.
To reactivate ACC, the driver must release
the parking brake (see page 122) and press
.

04 Comfort and driving pleasure
Adaptive Cruise Control (ACC)*
04
158* Option/accessory, for more information, see Introduction.
Automatic standby mode when ACC
changes target vehicles
If the vehicle ahead turns suddenly, there may be
a stationary vehicle ahead
The following only applies at speeds below
approximately 18 mph (30 km/h):
If ACC changes target vehicles (the vehicle that
the radar sensor has detected) from a moving
vehicle to a stationary one, the system will
apply the brakes in your vehicle.
WARNING
At speeds above 18 mph (30 km/h), ACC
will not react to a stationary vehicle and
apply the brakes but will instead accelerate
to the previously set speed. The driver must
actively apply the brakes to stop the vehicle.
ACC disengages and goes into standby mode
if:
•Your vehicle's speed goes below 10 mph
(15 km/h) and ACC cannot determine if the
target object is a stationary vehicle or some
other type of object such as e.g., a speed
bump.
•Your vehicle's speed goes below 10 mph
(15 km/h) and the vehicle ahead turns so
that ACC no longer has a target vehicle to
follow.
No automatic braking when at a
standstill
In certain situations, ACC will no longer apply
the brakes and go into standby mode while the
vehicle is not moving. This means that the
driver will have to apply the brakes.
This happens if:
•The driver presses the brake pedal
•The parking brake is activated
•The gear selected is moved to P,N or R
•The driver presses the button to put
ACC in standby mode
The parking brake is applied
automatically
In certain situations, ACC will apply the parking
brake in order to continue keeping the vehicle
at a standstill.
This happens if:
•The driver opens the door or takes off
his/her seat belt
•DSTC is put in Sport mode (see page 148)
•ACC has kept the vehicle at a standstill for
more than 2 minutes
•The engine has been switched off
•The brakes have overheated
Turning ACC off completely
•From standby mode, press once.
•From active mode, press twice.
The set speed and time interval are then
cleared from the system's memory and cannot
be resumed by pressing
.
The radar sensor and its limitations
In addition to being used by ACC, the radar
sensor is also used by Distance Alert (see
page 163) and Collision Warning with Full
Auto-brake and Pedestrian Detection (see
page 171). This sensor is designed to detect
cars or larger vehicles driving in the same
direction as your vehicle, in the same lane.

04 Comfort and driving pleasure
Adaptive Cruise Control (ACC)*
04
160* Option/accessory, for more information, see Introduction.
In curves, the radar sensor may detect the
wrong vehicle or lose sight of the target
vehicle.
WARNING
•Adaptive Cruise Control cannot cover
all driving situations and traffic, weather
and road conditions. The "Function"
section provides information about lim-
itations that the driver must be aware of
before using this feature.
•This system is designed to be a supple-
mentary driving aid. It is not, however,
intended to replace the driver's atten-
tion and judgement. The driver is
responsible for maintaining a safe dis-
tance and speed and must intervene if
Adaptive Cruise Control does not main-
tain a suitable speed or suitable dis-
tance to the vehicle ahead.
•Maintenance of ACC components may
only be performed by a trained and
qualified Volvo technician.
WARNING
•Adaptive Cruise Control is not a colli-
sion avoidance system. The driver is
always responsible for applying the
brakes if the system does not detect
another vehicle.
•Adaptive Cruise Control does not react
to people or animals, or small vehicles
such as bicycles and motorcycles. It
also does not react to slow moving,
parked or approaching vehicles, or sta-
tionary objects.
•Do not use Adaptive Cruise Control in
demanding driving conditions such as
city driving or other heavy traffic situa-
tions, in slippery conditions, when there
is a great deal of water or slush on the
road, during heavy rain or snow, in poor
visibility, on winding roads or on high-
way on- or off-ramps.
Fault tracing and actions
If the message Radar blocked See manual is
displayed, this means that the radar signals
from the sensor have been obstructed and that
a vehicle ahead cannot be detected.
This, in turn, means that the functions of the
ACC, Distance Alert, and Collision Warning
System with Auto-brake and Pedestrian
Detection will not function.
The table lists possible causes for this mes-
sage being displayed, and suitable actions.
CauseAction
The surface of the radar in the grille is dirty or obstructed in some way.Clean the radar surface, or remove the object causing the obstruction.
Heavy rain or snow is interfering with the radar signals.No action possible. Heavy precipitation may affect the function of the
radar.

04 Comfort and driving pleasure
Adaptive Cruise Control (ACC)*
04
162* Option/accessory, for more information, see Introduction.
SymbolMessageDescription
-Cruise control UnavailableACC cannot be put in active mode. This may be due to:
•high brake temperature
•the radar sensor is obstructed (by heavy rain, snow, etc.)
Radar blocked See manualACC has been temporarily disconnected because the radar is obstructed in some way and cannot
detect other vehicles.
See page 158 for information on the radar sensor’s limitations.
Cruise control Service
requiredACC is not functioning.
Contact a trained and qualified Volvo service technician.
Press Brake To hold + an
audible signalThe vehicle is at a standstill and ACC will release the brakes before the parking brake engages to keep
the vehicle stopped but a problem with the parking brake means that the vehicle may begin to roll.
The driver will have to apply the brakes. The message will remain in the display and the audible signal
will continue until the driver applies the brakes or presses the accelerator pedal.
–Below 20 mph Only follow-
ingThis is displayed if you try to activate ACC at speeds below approx. 18 mph (30 km/h) without a vehicle
ahead within range (approx. 100 ft/30 meters).

04 Comfort and driving pleasure
City Safety™
04
166
Introduction
City Safety™1 is a support system designed to
help the driver avoid low speed collisions when
driving in slow-moving, stop-and-go traffic.
City Safety™ is not active if your vehicle’s
speed is below approximately 2 mph (4 km/h).
This means that City Safety™ will not react if
your vehicle approaches another vehicle at
very low speed, for example, when parking.
The function is active at speeds up to approx-
imately 18 mph (30 km/h) and assists the driver
by applying the brakes automatically, thereby
avoiding or helping to reduce the effects of a
collision.
City Safety™ is designed to intervene as late
as possible to help avoid unnecessary activa-
tion.
City Safety™ triggers brief, forceful braking if a
low-speed collision is imminent. However, the
system will not intervene in situations where
the driver actively steers the vehicle or applies
the brakes, even if a collision cannot be avoi-
ded. This is done in order to always give the
driver’s actions highest priority.
City Safety™ activates in situations where the
driver has not applied the brakes in time, whichmeans that the system cannot help the driver
in all situations.
City Safety™ should not be used to alter the
way in which the driver operates the vehicle.
The driver should never rely solely on this sys-
tem to safely stop the vehicle.
Normally, the occupants of the vehicle will not
be aware of City Safety™ except when the
system intervenes when a low-speed collision
is imminent.
If the vehicle is also equipped with the optional
Collision Warning with Full Auto-brake and
Pedestrian Detection system, the two systems
interact. For more information about the Colli-
sion Warning with Auto-brake system, see
page 171.WARNING
•City Safety™ is a supplemental aid to
the driver. It can never replace the
driver’s attention to traffic conditions or
his/her responsibility for operating the
vehicle in a safe manner.
•City Safety™ does not function in all
driving situations or in all traffic, weather
or road conditions.
•City Safety™ only reacts to vehicles
traveling in the same direction as your
vehicle and does not react to small vehi-
cles, bicycles or motorcycles or to peo-
ple or animals.
•City Safety™ is not activated when your
vehicle is backing up.
•City Safety™ functions at speeds up to
18 mph (30 km/h). This system can help
prevent a collision if the difference in
speed between your vehicle and the
vehicle ahead is less than 9 mph
(15 km/h). If the difference in speed is
greater, a collision cannot be avoided
but the speed at which the collision
occurs can be reduced. The driver must
apply the vehicle’s brakes for full brak-
ing effect.
•Never wait for City Safety™ to intervene
in a potential collision situation. The
1City Safety is a registered trademark of the Volvo Car Corporation

04 Comfort and driving pleasure
City Safety™
04

167
driver is always responsible for main-
taining a safe distance to the vehicle
ahead.
Function
Location of the laser sensor in the windshield2
City Safety™ monitors traffic ahead of you
using a laser sensor mounted in the upper sec-
tion of the windshield. If a collision is imminent,
City Safety™ will automatically apply the
brakes, which may feel like hard braking.
If the difference in speed between your vehicle
and the vehicle ahead is more than approxi-
mately 9 mph (15 km/h), City Safety™ alone
cannot prevent a collision from taking place.The driver must apply the brakes to help avoid
a collision or reduce its effect.
When the function activates and applies the
brakes, a message will appear in the informa-
tion display to indicate that the system is/has
been active.
NOTE
•When City Safety™ applies the brakes,
the brake lights will illuminate.
•In cases where City Safety™ has stop-
ped the vehicle, the system will then
release the brakes. The driver must
apply the brakes to keep the vehicle at
a standstill.
Using City Safety™
NOTE
The City Safety™ function is activated auto-
matically each time the engine has been
switched off and restarted.
On and OffIn certain situations, it may be desirable to
switch City Safety™ off, such as when drivingin close quarters where leaves, branches, etc.
may obscure the hood and windshield.
When the engine is running, City Safety™ can
be switched off as follows:
Press My Car in the center console control
panel and go to Settings
Car settings
Driver support systemsCity Safety.
Select
Off.
If the engine is switched off, City Safety™ will
reactivate when the engine is restarted.
WARNING
The laser sensor emits light when the igni-
tion is in mode II or higher, even if City
Safety™ has been switched off.
To switch City Safety™ on again:
•Follow the same procedure as for switch-
ing City Safety™ off but select ON.
2The illustration is schematic; details will vary, depending on the model

04 Comfort and driving pleasure
City Safety™
04
170
Symbols and messages in the display
When City Safety™ automatically applies the
brakes, one or more of the symbols in the maininstrument panel may illuminate and its asso-
ciated message will be displayed.
A text message can be erased by pressing
briefly on the READ button on the turn signal
lever.
SymbolMessageMeaning/action required
Auto braking by City SafetyCity Safety™ is applying/has applied the brakes automatically.
Windscreen Sensors
blockedThe laser sensor is temporarily not functioning due to an obstruction.
•Remove the obstruction and/or clean the windshield in front of the sensor(s).
For more information on the sensor’s limitations, see page 168.
City Safety Service requiredCity Safety™ is not functioning.
•If this message remains in the display, have the system checked by a trained and qualified Volvo
service technician.