brakes VOLVO XC90 2015 User Guide

DRIVER SUPPORT
253
Controls
Function buttons and symbols
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 standby mode
Reduces the set speed
Target vehicle indicator: ACC has detected and is following a target vehicle using the settime interval
Instrument panel
Speed indicators
Set speed
Speed of the vehicle ahead
The current speed of your vehicle
Collision warning
Warning light
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, for more information, see Introduction.
254
Head-up-display *
A flashing light alerts the driver
A flashing icon will appear in the head-up dis- play* to alert the driver of a collision risk.
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.
Related information
• Adaptive Cruise Control (ACC) - fault tracing (p. 271)
• Starting and activating Adaptive CruiseControl (ACC) (p. 254)
• Adaptive cruise control passing assistance(p. 270) •
Setting an Adaptive Cruise Control timeinterval (p. 258)
• Changing Adaptive Cruise Control (ACC)speed (p. 257)
• Deactivating/resuming Adaptive CruiseControl (ACC) (p. 255)
• Adaptive Cruise Control (ACC) symbols andmessages (p. 272)
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.
Activating ACC (putting it in active mode and setting a speed)
Before ACC can be put in active mode:

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.
256 To temporarily deactivate and put Adaptive Cruise Control in standby mode:
Function buttons and symbols
–Press the button (2).
> The
symbol in the instrument panel
will change colors from WHITE to GRAY and the set speed in the center of thespeedometer will change from BEIGE toGRAY.
Standby mode due to action by the driverACC 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 set speed for more than 1 minute. In these cases, the driver will have to regulate the vehicle'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 modeACC 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 •
engine speed (rpm) is too high/low
• the wheels lose traction
• 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 modeTo 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. 252)
• Starting and activating Adaptive Cruise Control (ACC) (p. 254)
• Changing Adaptive Cruise Control (ACC)speed (p. 257)
• Setting an Adaptive Cruise Control timeinterval (p. 258)

DRIVER SUPPORT
260
WARNING
•Pilot Assist is designed to be a supple- mentary driving aid and cannot cover alldriving situations, traffic, weather and/orroad conditions.
• The driver should be familiar with all ofthe information in this article regardingPilot Assist, including its limitations.
• Pilot Assist is not intended to replace thedriver's attention and judgement.
• Pilot Assist must only be used wherethere are clearly visible traffic lane sidemarker lines on both sides of the currenttraffic lane. In other circumstances thereis an increased risk of collision with sur-rounding obstacles that are not detectedby the system.
• The driver is always responsible for steer-ing the vehicle and maintaining a suitablespeed and distance to the vehicle aheadand must intervene if necessary, even ifPilot Assist is being used.
Pilot Assist is designed to regulate speed smoothly but in situations calling for fast braking,the driver must apply the brakes. This applies tosituations where there are considerable differen-ces in speed or if the vehicle ahead brakes sud-denly. Due to the limitations of the camera andradar sensor, the system may apply the brakes inyour vehicle suddenly or not at all. The default speed for Pilot Assist is preset toapprox. 30 mph (50 km/h) and cannot bechanged. If the vehicle ahead increases speed toover 30 mph (50 km/h) and pulls away from yourvehicle, Pilot Assist will go into standby mode.
NOTE
•
Pilot Assist maintenance should only be carried out by a trained and qualifiedVolvo service technician.
• Pilot Assist regulates your vehicle'sspeed using the accelerator pedal andthe brakes. Please be aware that theremay be a faint sound from the brakeswhen the system is using them.
WARNING
•Pilot Assist does not react to people or animals, or small vehicles such as bicy-cles and motorcycles. It also does notreact to low trailers, slow moving, parkedor approaching vehicles, or stationaryobjects.
• Do not use Pilot Assist in demandingdriving conditions such as city driving orother heavy traffic situations, in slipperyconditions, when there is a great deal ofwater or slush on the road, during heavyrain or snow, in poor visibility, on windingroads or on highway on- or off-ramps.
Pilot Assist overview
Controls
Function buttons and symbols
[]: Press to activate Pilot Assist or put it
in standby mode
Arrow key [ < ]: change from Pilot Assist to
Adaptive Cruise Control (symbol (6) will also change)
Reduce the distance (time interval) to the vehicle ahead
Arrow key [ > ]: change from Adaptive Cruise
Control to Pilot Assist (symbol (6) will also change)
Increase the distance (time interval) to the vehicle ahead
Function symbols

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.261
Instrument panel
Speed indication
Set speed
Speed of the vehicle ahead
Your vehicle's current speed.
Collision warning
Warning light
Pilot Assist can exert brake force that is equiva- lent to approximately 40% of the vehicle's totalbraking capacity. In situations requiring more brake force than Pilot Assist can provide and if the driver does notapply the brakes, an audible signal from the CitySafety system will sound and warning light willilluminate in the windshield to alert the driver toreact.
Head-up-display*
A flashing symbol alerts the driver
If the vehicle is equipped with a head-up display *,
a flashing symbol in the windshield will alert the driver.
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, for more information, see Introduction.
262
WARNING
Pilot Assist only provides warnings for vehi- cles that its radar sensor and camera havedetected. For this reason, a warning may begiven later than expected or not at all. Thedriver should never wait for a warning beforeapplying the brakes.
Related information
• Pilot Assist limitations (p. 266)
• Pilot Assistauto-hold brake function (p. 266)
• Distance Alert
* (p. 314)
• Other Adaptive Cruise Control (ACC) func- tions (p. 268)
• Setting an Adaptive Cruise Control timeinterval (p. 258)
Starting and activating Pilot Assist
The Pilot Assist feature helps keep the vehicle in its current traffic lane, at a set speed and a settime interval to the vehicle ahead.
Function buttons and symbols
PrerequisitesThe prerequisites for activating Pilot Assist are:
• The vehicle ahead must be within a reasona- ble (detectable) distance
• The camera must be able to clearly detectthe traffic lane's side marker lines
• The vehicle's speed must be under approx.30 mph (50 km/h). A WHITE symbol indicates that Pilot Assist has been selected. In other cases, the WHITE arrow pointing to the right indi-cates that the system is availa-ble.
A YELLOW symbol with a flashing WHITE arrowindicates that the system is about to shift intostandby mode.
With ACC in standby mode: 1. Tap ▶ (4).
> The symbol will be displayed and Pilot Assist will go into standby mode.
2. Press the
button (1) on the left-side
steering wheel keypad.
> Pilot Assist will go into active mode.
WARNING
• Pilot Assist is not a collision avoidance system. The driver is always responsiblefor applying the brakes if the system doesnot detect another vehicle.
• Do not use Pilot Assist in demandingdriving conditions such as city driving orother heavy traffic situations, in slipperyconditions, when there is a great deal ofwater or slush on the road, during heavy

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.
264
Standby mode due to driver actionIf a turn signal is used or if the accelerator pedal is pressed, Pilot Assist will temporarily go intostandby mode. When the turn signal is switchedoff or the accelerator pedal is released, PilotAssist will reactivate automatically. Automatic reactivation from standby mode can be done within 1 minute. After 1 minute haselapsed, Pilot Assist must be reactivated man- ually by pressing the
button.
Pilot Assist will temporarily go into standby mode if: • the brakes are applied
• the gear selector is moved to the
N position.
The driver will then have to regulate speed and distance to the vehicle ahead, or reactivate Pilot Assist manually by pressing the
button on
the left-side steering wheel keypad.
Automatic standby modePilot Assist interacts with other systems, such as Electronic Stability Control. If any of these othersystems are not functioning properly, Pilot Assistwill automatically be deactivated.
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.
Pilot Assist switches automatically to standby mode if: • the camera cannot detect the traffic lane's side marker lines
• the vehicle ahead is not within a reasonable(detectable) distance
• the driver's hands are not on the steeringwheel
• the driver unbuckles the seat belt
• engine speed (rpm) is too high/low
• the wheels lose traction
• brake temperature is too high
• the stability system's
ESC Sport Mode is
activated
• drive mode
Off Road is selected
• The camera/radar sensor is covered by e.g., wet snow or if heavy rain interferes with radarwaves
Reactivating Pilot Assist from standby mode
–Press the button (1).
> The most recently set speed will be used.
Related information
• Pilot Assist
* (p. 259)

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.
266
Pilot Assistauto-hold brake function
At certain speeds, Pilot Assist provides braking effect.
Stop-and-go drivingDuring brief stops in slow-moving traffic or att traffic lights where the vehicle is not stopped formore than 3 seconds, driving will resume auto-matically. If it takes more than 3 seconds for thevehicle ahead to begin moving again, Pilot Assistwill go into standby mode and the auto-holdbrake function will activate. The driver will then have to reactivate Pilot Assist as follows:
–• Press the button
• Press the accelerator pedal
> Pilot Assist will resume following the vehi- cle ahead if it begins to move within approx. 6 seconds.
NOTE
• Pilot Assist can keep the vehicle station- ary for max. 5 minutes, after which theparking brake will be set and Pilot Assistwill go into standby mode.
• The parking brake must be releasedbefore Pilot Assist can be reactivated.
Deactivating the auto-hold brake functionIn certain situations, auto-hold will be deactivated when the vehicle is at a standstill and Pilot Assistwill go into 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 Pilot Assist 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:
• the driver unbuckles the seat belt or opens the door
• Pilot Assist has kept the vehicle at a stand-still for more than approx. 5 minutes
• the engine is turned off
• the brakes overheat
Related information
•
Pilot Assist
* (p. 259)
Pilot Assist limitations
Pilot Assist functionality may be limited in certain situations.

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.267
WARNING
•Pilot Assist is not a collision avoidance system. The driver is always responsiblefor applying the brakes if the system doesnot detect another vehicle.
• Do not use Pilot Assist in demandingdriving conditions such as city driving orother heavy traffic situations, in slipperyconditions, when there is a great deal ofwater or slush on the road, during heavyrain or snow, in poor visibility, on windingroads or on highway on- or off-ramps.
• Pilot Assist uses the vehicle's cameraand radar sensor, which have limitations.
Pilot Assist may deactivate or not function optimally if:
• the lane's side market lines are missing, badly faded or cross each other.
• the division of lanes is not clear, e.g.,when a line divides or merges withanother, at exits or if there are many roadsigns/markers.
• if there are edges or other lines on ornear the lane, e.g., curbs, cracks, repairedareas, sharp shadows, etc.
• the lane is narrow or winding.
• the weather conditions (rain, snow, fog,slush, poor visibility, backlighting, etc).
The driver should also be aware that Pilot Assist has the following limitations:
• High curbs, barriers and temporary obsta- cles (cones, barriers etc) may not bedetected or could be detected incorrectlyas side marker lines, which may create arisk of collision. The driver must ensure asafe distance to these obstacles.
• The camera or radar sensor may not beable to detect objects if there are pot-holes or if there are stationary objectspartially or completely blocking the road.
• Pilot Assist does not "see" pedestrians,animals, etc.
• Pilot Assist's steering capacity is limitedand may not always be able to help thedriver keep the vehicle in the lane.
The driver can always take action to override Pilot Assist.
Steep roads and/or heavy loadsPilot Assist is primarily intended for use on rela-tively level roads. The function may not be able tomaintain the correct time interval to the vehicleahead on when driving down steep hills, when thevehicle is transporting a heavy load or if it is tow-ing a trailer. The driver should be attentive andprepared to apply the brakes in these situations.
Related information
• Radar sensor limitations (p. 245)
• Pilot Assist
* (p. 259)
• Starting and activating Pilot Assist (p. 262) •
Setting a Pilot Assist time interval (p. 265)
• Deactivating/resuming Pilot Assist (p. 263)
• Pilot Assistauto-hold brake function (p. 266)
• Camera limitations (p. 241)

DRIVER SUPPORT
268
Other Adaptive Cruise Control (ACC) functionsACC is an optional system designed to assist
the driver by maintaining a set speed or a set time interval to the vehicle ahead.
ACC has several supplementary functions:
• Changing target vehicles
• Automatic standby mode when changing tar- gets
• Auto-hold brake function
• Deactivation of the auto-hold brake function
• Automatically setting the parking brake
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.
WARNING
If ACC changes targets from a moving vehicle to a stationary one at speeds above 20 mph
(30 km/h), 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 determine ifthe 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.