brakes VOLVO XC90 2017 Owner´s Manual

DRIVER SUPPORT
* Option/accessory.263
NOTE
Before CC can be activated, the vehicle's speed must be at least 20 mph (30 km/h).This is also the lowest speed that can be set.
Activating CC (putting it in active mode and setting a speed)
–With the symbol displayed (CC is in
standby mode), press the
button (2) on
the left-side steering wheel keypad.
> This puts CC in active mode and will maintain the vehicle's current speed.
Related information
• Cruise Control (CC) (p. 262)
• Switching between Cruise Control and Adaptive Cruise Control
* (p. 266)
• Deactivating/resuming Cruise Control (CC) (p. 264)
• Turning Cruise Control off (p. 265)
Changing Cruise Control speed
Changing a set speed
Function buttons and symbols (generic illustration)
–Change a set speed by pressing the (1)
or — (3) buttons briefly or by pressing and
holding them:
• Press briefly
: changes speed in
+/– 5 mph (+/– 5 km/h) increments. Each press changes the vehicle's speedby +/– 5 mph (+/– 5 km/h).
• Press and hold
: changes the speed
+/– 1 mph (+/– 1 km/h) at a time.Release the button when the set speedindicator (4)/(6) has moved to the desiredspeed.
If speed is increased by pressing the accelerator pedal before the
button is pressed, the vehi-
cle's speed when the button is pressed will become the set speed assuming that the accel- erator pedal is still depressed when the button ispressed. A temporary increase in speed, such as when passing another vehicle, does not affect the CCset speed. The vehicle will return to the set speedwhen the accelerator pedal is released. Alwaysobserve posted speed limits.
Engine braking instead of applying the
brakes
CC regulates speed by applying the brakeslightly. To avoid a loss of speed when drivingdown hills, use the engine braking functioninstead of letting the CC apply the brakes. In thissituation, the driver can temporarily deactivate theCC braking function. To do so:
–Press the accelerator pedal approx. halfway down and release it.
> CC will automatically deactivate the auto- matic brake function and will then only use the engine braking function.
Related information
• Cruise Control (CC) (p. 262)

DRIVER SUPPORT
264
Deactivating/resuming Cruise Control (CC) Cruise Control (CC) can be temporarily deacti- vated and put in standby mode.
Deactivating and putting CC in standbymode
To temporarily deactivate and put Cruise Control in standby mode:
Function buttons and symbols (generic illustration)
–Press the button (2).
> The set speed marker (4) and symbols will change colors from WHITE to GRAY. This indicates that CC is temporarily in standby mode and will not maintain a setspeed.
Standby mode due to action by the driver
CC is temporarily deactivated and put in standby mode if:
• the brakes are applied
• The gear selector is moved to
N
• the vehicle is driven faster than the setspeed for more than 1 minute.
In these cases, the driver will have to regulate thevehicle's speed. A temporary increase in speed, such as when passing another vehicle, does not affect the CCset speed. The vehicle will return to the set speedwhen the accelerator pedal is released.
Automatic standby mode
CC switches automatically to standby mode if:
• the wheels lose traction
• engine speed (rpm) is too high/low
• brake temperature is too high
• the vehicle's speed goes below approx. 20 mph (30 km/h)
In these cases, the driver will have to regulate thevehicle's speed.
Reactivating CC from standby modeTo reactivate CC after it has temporarily been putin standby mode:
–Press the button (1).
> The set speed marker (4) will change color from GRAY to WHITE. The vehicle will then return to the most recently set
speed .
WARNING
There may be a significant increase in speed after the
button has been pressed.
or

DRIVER SUPPORT
* Option/accessory.
266
Switching between Cruise Control and Adaptive Cruise Control *
In models equipped with the optional ACC, the driver can toggle between CC and ACC.
A symbol in the instrument panel will indicate which system is currently being used:
CC
Cruise Control ACC
Adaptive Cruise Control
AA
A If the symbol is WHITE, the function is active. If the symbol is GRAY, the function is in standby mode.
Switching from ACC to CCTo switch from ACC to CC: 1. Put ACC in standby mode with the
but-
ton on the left-side steering wheel keypad.
2. From the center display's Function view, tap the
Cruise control button. The button's indi-
cator will change from GRAY to GREEN.
> The symbol in the instrument panel will
change from
(ACC) to (CC) and CC is in standby mode (ready for use but not currently maintaining a setspeed). 3.
Press the
button on the left-side steer-
ing wheel keypad.
> CC goes into active mode and sets the vehicle's current speed.
WARNING
Switching from ACC to CC means that:
• Your vehicle will
no longer automatically
maintain a set distance to a vehicle ahead.
• Only the set speed will be maintained andthe driver will have to apply the brakeswhen needed.
If CC was activated when the engine was turnedoff, ACC will be selected and go into standbymode when the engine is restarted.
Switching from CC to ACCTo switch from CC to ACC: 1. Put CC in standby mode with the
button
on the left-side steering wheel keypad. 2. In the center display's Function view, tap the
Adaptive Cruise Control button. The but-
ton's indicator will change from GREEN to GRAY.
> The symbol in the instrument panel will
change from
(CC) to (ACC) and ACC is in standby mode (ready for use but not currently maintaining a setspeed/time interval).
3. Press the
button on the left-side steer-
ing wheel keypad.
> ACC goes into active mode and sets the vehicle's current speed and the selected time interval to the vehicle ahead.
Related information
• Cruise Control (CC) (p. 262)
• Adaptive Cruise Control (ACC)
* (p. 269)
• Center display overview (p. 28)

||
DRIVER SUPPORT
270vehicle set by the driver. If the radar sensor does not detect a vehicle ahead, ACC will insteadmaintain the speed set by the driver. ACC is designed to smoothly regulate speed. However, the driver must apply the brakes in sit-uations that require immediate braking such aswhen there are great differences in speedbetween vehicles, or if the vehicle ahead brakessuddenly. Due to limitations in the radar sensor,braking may occur unexpectedly or not at all. Adaptive Cruise Control can follow another vehi- cle from a standstill up to 125 mph (200 km/h).Always observe posted speed limits. The driver can also toggle between ACC and Cruise Control (CC) – see the article "Switchingbetween Cruise Control and Adaptive CruiseControl".
WARNING
•
It is advisable to read through all of the related articles pertaining to ACC (seethe list at the end of this article).
• Adaptive Cruise Control cannot cover alldriving situations and traffic, weather androad conditions.
• This system is designed to be a supple-mentary driving aid. It is not, however,intended to replace the driver's attentionand judgement. The driver is responsiblefor maintaining a safe distance and speedand must intervene if Adaptive CruiseControl does not maintain a suitablespeed or suitable distance to the vehicleahead.
• Maintenance of ACC components mayonly be performed by a trained and quali-fied Volvo technician.
OverviewThe distance to the vehicle ahead (in the samelane) is monitored by a radar sensor. Your vehi-cle's speed is regulated by accelerating andbraking. The brakes may emit a sound when theyare being modulated by the adaptive cruise con-trol system. This is normal.
WARNING
•
Adaptive Cruise Control is not a collision avoidance system. The driver is alwaysresponsible for applying the brakes if thesystem does not detect another vehicle.
• Adaptive Cruise Control does not react topeople or animals, or small vehicles suchas bicycles and motorcycles. It also doesnot react to slow moving, parked orapproaching vehicles, or stationaryobjects.
• Do not use Adaptive Cruise Control indemanding driving conditions such as citydriving or other heavy traffic situations, inslippery conditions, when there is a greatdeal of water or slush on the road, duringheavy rain or snow, in poor visibility, onwinding roads or on highway on- or off-ramps.

DRIVER SUPPORT
}}
271
Controls
Function buttons and symbols (generic illustration)
Increases the set speed or puts ACC back into active mode (previous settings will beresumed)
Puts ACC in active mode and stores the cur- rent speed or puts ACC in standby mode
Reduces the set speed
Increases the time interval/distance to the vehicle ahead
Reduces the time interval/distance to the vehicle ahead
Target vehicle indicator: ACC has detected and is following a target vehicle using the settime interval
Distance/time indicator
Instrument panel
Speed indicators
Set speed
Speed of the vehicle ahead
The current speed of your vehicle
See the article "Adaptive cruise control symbols and messages" for examples of different combi-nations of symbols, depending on the traffic sit-uation.
Collision warning
Warning light in the windshield
Adaptive Cruise Control can exert brake force that is equivalent to approximately 40% of thevehicle's total braking capacity. In situations requiring more brake force than ACC can provide and if the driver does not applythe brakes, an audible signal from the City Safetysystem will sound and warning light will illuminatein the windshield to alert the driver to react.
NOTE
Strong sunlight, reflections, extreme light con- trasts, the use of sunglasses, or if the driver isnot looking straight ahead may make the vis-ual warning signal in the windshield difficult tosee.

||
DRIVER SUPPORT
* Option/accessory.
272
WARNING
Adaptive Cruise Control only warns of vehicles detected by the radar sensor. In some casesthere may be no warning or the warning maybe delayed. The driver should always apply thebrakes when necessary.
Head-up-display *
A flashing light alerts the driver
A flashing icon will appear in the head-up display to alert the driver of a collision risk.
NOTE
Strong sunlight, reflections, extreme light con- trasts, the use of sunglasses, or if the driver isnot looking straight ahead may make the vis-ual warning signal in the windshield difficult tosee.
Related information
•Starting and activating Adaptive Cruise Control (ACC)
* (p. 272)
• Changing Adaptive Cruise Control (ACC) speed (p. 275)
• Setting an Adaptive Cruise Control timeinterval (p. 276)
• Changing target vehicles and automaticbraking with Adaptive Cruise Control (ACC)(p. 277)
• Switching between Cruise Control and Adaptive Cruise Control
* (p. 266)
• Passing Assistance with Adaptive Cruise Control or Pilot Assist (p. 277)
• Deactivating/resuming Adaptive CruiseControl (ACC) (p. 273)
• Adaptive Cruise Control (ACC) - trouble-shooting (p. 279)
• Adaptive Cruise Control (ACC) symbols andmessages (p. 281)
• Pilot Assist
* (p. 283)
• Distance Alert
* (p. 267)
• Head-up display (HUD)
* (p. 116)
• Radar sensor limitations (p. 297)
Starting and activating Adaptive Cruise Control (ACC)
*
ACC must first be put in active mode before it can be started in order to regulate speed or aset time interval to the vehicle ahead.
Starting ACC (putting it in standby
mode)
Function buttons and symbols
–Press ◀ (2) or ▶ (3) to scroll to the ACC
(
) function. The symbol (4) will be dis-
played in the instrument panel.
> The symbol indicates that ACC has been
started and is in standby mode . In
standby mode, the vehicle will not main-
tain a set speed or a time interval to the vehicle ahead.

||
DRIVER SUPPORT
* Option/accessory.
274
WARNING
When ACC is in standby mode, the driver has to control the vehicle's speed and distance toa vehicle ahead. When ACC is in standby mode, the driver will be alerted if the distance to the vehicle aheadis too short by the Distance Alert function.See the article "Distance Alert" for additionalinformation.
Standby mode due to action by the driver
ACC is temporarily deactivated and put in standby mode if:
• the brakes are applied
• The gear selector is moved to
N
• the vehicle is driven faster than the setspeed for more than 1 minute.
In these cases, the driver will have to regulate thevehicle's speed. A temporary increase in speed, such as when passing another vehicle, does not affect the ACCset speed. The vehicle will return to the set speedwhen the accelerator pedal is released.
Automatic standby mode
ACC interacts with other systems, such as Electronic Stability Control. If any of these othersystems are not functioning properly, ACC willturn off automatically.
WARNING
If this happens, the driver will be alerted by an audible signal and a message in the instru-ment panel. The driver will have to adapt thevehicle's speed, apply the brakes when nec-essary and keep a safe distance to the vehicleahead.
ACC switches automatically to standby mode if: • the vehicle's speed goes below approx. 3 mph (5 km/h) and ACC cannot determineif the vehicle ahead is stationary or is anobject such as a speed bump, etc
• the vehicle's speed goes below approx.3 mph (5 km/h) and the vehicle aheadchanges lanes or turns so that ACC nolonger has a target vehicle to follow
• the driver opens the door
• the driver unbuckles the seat belt
• the engine speed (rpm) is too high/low
• the wheels lose traction
• the brake temperature is too high
• the parking brake is applied
• the stability system's
ESC Sport Mode is
activated
• the
Off Road drive mode is selected
• The radar sensor is covered by e.g., wet snow or if heavy rain interferes with radar waves
Reactivating ACC from standby mode
Generic illustration
To reactivate ACC after it has temporarily been put in standby mode:
–Press the button (1).
> The vehicle will then return to the most
recently set speed .
WARNING
There may be a significant increase in speed after the
button has been pressed.
Related information
•Adaptive Cruise Control (ACC)
* (p. 269)
• Starting and activating Adaptive Cruise Control (ACC)
* (p. 272)
• Setting an Adaptive Cruise Control time interval (p. 276)

DRIVER SUPPORT
}}
* Option/accessory.277
Passing Assistance with Adaptive Cruise Control or Pilot Assist
ACC or Pilot Assist can assist the driver when passing other vehicles.
How passing assistance worksWhen ACC or Pilot Assist is following another vehicle and the driver indicates that he/she isabout to pass that vehicle by using the left turnsignal, ACC or Pilot Assist will begin acceleratingtoward the vehicle ahead before your vehicle hasmoved into the passing lane. The function will then delay a speed reduction to avoid early braking as your vehicle approachesthe slower-moving vehicle. The function is active until your vehicle has passed the other vehicle.
WARNING
Be aware that this function may be activated in situations other than when passing a vehi-cle, such as if the turn signal is used to indi-cate a lane change or to indicate a turn. Thevehicle will accelerate briefly.
Using passing assistanceTo activate passing assistance:
• Your vehicle (ACC or Pilot Assist) must be following another vehicle (the target vehicle).
• Current speed must be at least approx.45 mph (70 km/h ). •
The speed set for ACC or Pilot Assist mustbe high enough to safely pass the vehicleahead.
Starting passing assistanceTo start a passing assistance sequence:
• Activate the left turn signal.
Passing assistance limitations
WARNING
The driver should be prepared for sudden changes when passing assistance is used. Incertain cases, there may be undesired accel-eration. Certain situations should be avoided, such as: • If the vehicle is approaching an exit to the left or a left turn.
• If the vehicle ahead slows down beforeyour vehicle has moved into the passinglane.
• Traffic in the passing lane slows down.
Passing assistance in these situations can bedeactivated by putting ACC or Pilot Assist instandby mode.
Related information
• Pilot Assist
* (p. 283)
• Adaptive Cruise Control (ACC)
* (p. 269)
Changing target vehicles and automatic braking with AdaptiveCruise Control (ACC)
At certain speeds, Adaptive Cruise Control can change target vehicles and automatically applythe brakes.
Changing target vehicles
If the target vehicle turns suddenly, there may be a sta- tionary vehicle ahead
When ACC is actively following another vehicle at speeds under 20 mph (30 km/h) and changes
targets from a moving vehicle to a stationary one, the system will brake for the stationary vehicle.

||
DRIVER SUPPORT
* Option/accessory.
278
WARNING
At speeds above 20 mph (30 km/h), if ACC
changes targets from a moving vehicle to a stationary one, the system will not react to the
stationary vehicle and will accelerate to the previously set speed. The driver must actively apply the brakes to slow/stop the vehicle.
Automatic standby mode when changing targets
ACC disengages and goes into standby mode if:
• your vehicle's speed goes below approx. 3 mph (5 km/h) and ACC cannot determineif the target object is a stationary vehicle orsome other type of object such as a speedbump, etc
• the vehicle's speed goes below approx.3 mph (5 km/h) and the vehicle aheadchanges lanes or turns so that ACC nolonger has a target vehicle to follow.
Auto-hold brake functionIn slow-moving, stop-and-go traffic or when stop-ped at a traffic light, driving will resume automati-cally if the vehicle is not stopped for more thanapprox. 3 seconds. If it takes more than3 seconds for the vehicle ahead to begin movingagain, ACC will go into standby mode and theauto-hold brake function will activate.
–The driver will then have to reactivate ACC in one of the following ways:
• Press the
button on the left-side
steering wheel keypad.
• Press the accelerator pedal.
> ACC will resume following the vehicle ahead (target vehicle) if it begins to move within approx. 6 seconds.
NOTE
ACC can keep the vehicle at a standstill for up to 5 minutes, after which the parking brakewill be set and ACC will go into standbymode. The parking brake has to be released before ACC can be reactivated.
Deactivation of the auto-hold brake function
In certain situations, auto-hold will be deactivated when the vehicle is at a standstill and ACC will gointo standby mode. This means that the brakes will be released and the vehicle can begin to roll. The driver must actively apply the brakes to keep the vehicle at a standstill. This can occur in the following situations: • the driver presses the brake pedal
• the parking brake is set •
the gear selector is moved to the
P, N or R
positions
• the driver puts ACC in standby mode.
Automatically setting the parking brakeIn certain situations, the parking brake is set automatically to help keep the vehicle at a stand-still. This occurs if ACC keeps the vehicle at a stand- still with the brakes and:
• the driver unbuckles the seat belt or opensthe door
• ACC has kept the vehicle at a standstill formore than approx. 5 minutes
• the brakes overheat
• the engine is turned off.
Related information
•
Adaptive Cruise Control (ACC)
* (p. 269)
• Auto-hold brake function (p. 356)
• Parking brake (p. 360)

DRIVER SUPPORT
* Option/accessory.
280
Adaptive Cruise Control (ACC) - limitations
Adaptive Cruise Control (ACC) functionality may be limited in certain situations.
Steep roads and/or heavy loadsAdaptive Cruise Control is primarily intended for use on relatively level roads. The function may notbe able to maintain the correct time interval tothe vehicle ahead when driving down steep hills.The driver should be attentive and prepared toapply the brakes in these situations. Do not use Adaptive Cruise Control when the vehicle is transporting a heavy load or if it is tow-ing a trailer.
Additional information
• The Off Road drive mode cannot be
selected if Adaptive Cruise Control is acti- vated.
• Adaptive Cruise Control uses the vehicle'scamera and radar sensor, which have certaingeneral limitations. See the articles "Cameralimitations" and "Radar sensor limitations"for additional information.
Related information
•
Adaptive Cruise Control (ACC)
* (p. 269)
• Radar sensor limitations (p. 297)
• Camera limitations (p. 301)