2017 VOLVO XC90 TWIN ENGINE HYBRID brake

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.303
Automatic braking with PilotAssist-1
The auto-hold brakes function as follows withPilot Assist.

Auto-hold brake function
In 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, Pilot Assist will go into standby mode andthe auto-hold brake function will activate.
–The driver will then have to reactivate PilotAssist in one of the following ways:
•Press the button on the left-sidesteering wheel keypad
•Press the accelerator pedal
>Pilot Assist will resume following the vehi-cle ahead (target vehicle) if it begins tomove within approx. 6 seconds.

NOTE
Pilot Assist can keep the vehicle at a stand-still for up to 5 minutes, after which the park-ing brake will be set and Pilot Assist will gointo standby mode.
The parking brake has to be released beforePilot Assist can be reactivated.
Deactivation of the auto-hold brake function
In certain situations, auto-hold will be deactivatedwhen the vehicle is at a standstill and Pilot Assistwill go into standby mode.
This means that the brakes will be released andthe vehicle can begin to roll.
The driver must actively apply the brakes to keepthe 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 Rpositions
•the driver puts Pilot Assist in standby mode

Automatically setting the parking brake
In certain situations, the parking brake is setautomatically to help keep the vehicle at a stand-still.
This occurs if:
•the driver unbuckles the seat belt or opensthe 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. 295)
•Pilot Assist-1* (p. 295)
•Starting and activating Pilot Assist-1*(p. 298)
•Setting a Pilot Assist-1 time interval (p. 300)
•Deactivating/resuming Pilot Assist-1(p. 301)
•Pilot Assist-1 limitations (p. 304)

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Pilot Assist-1 limitations
Pilot Assist functionality may be limited in certainsituations.
Pilot Assist is designed to help the driver in anumber of situations. However, the driver alwayshas the primary responsibility for maintaining asafe distance to other vehicles and for keepingthe vehicle in its proper traffic lane.

WARNING
Pilot Assist is not a collision avoidance sys-tem. The driver is always responsible forsteering or applying the brakes if the systemdoes not detect another vehicle.
Do not use Pilot Assist in demanding drivingconditions such as city driving or other heavytraffic situations, in slippery conditions, whenthere is a great deal of water or slush on theroad, during heavy rain or snow, in poor visibil-ity, on winding roads or on highway on- or off-ramps.
In certain situations, it may be difficult for PilotAssist to assist the driver correctly or to deac-tivate automatically. In such cases, it is advisa-ble not to use Pilot Assist. Examples of suchsituations may be:
•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.
•there are edges or other lines on or nearthe lane, e.g., curbs, cracks, repairedareas, sharp shadows, etc.
•the lane is narrow or winding.
•the lane is at the top of a hill, on anuneven road surface or over a bump.
•bad weather conditions (rain, snow, fog,slush, poor visibility, backlighting, etc).
The driver should also be aware that PilotAssist 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 PilotAssist.

Steep roads and/or heavy loads
Pilot 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. Thedriver should be attentive and prepared to applythe brakes in these situations.
Do not use Pilot Assist when the vehicle is trans-porting a heavy load or if it is towing a trailer.

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DRIVER SUPPORT
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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 attempts to regulate speed smoothlybut in situations calling for fast braking, the drivermust apply the brakes. This applies to situationswhere there are considerable differences inspeed or if the vehicle ahead brakes suddenly.Due to the limitations of the camera and radarsensor, the system may apply the brakes in yourvehicle suddenly or not at all.
Pilot Assist is designed to follow a vehicle aheadin the same traffic lane at a preset time intervalset by the driver. If the radar sensor does notdetect a vehicle ahead, the vehicle will insteadmaintain the speed set by the driver. This will alsobe the case if a vehicle ahead accelerates andexceeds the set speed.
•Pilot Assist can follow another vehicle from astandstill up to a speed of approx. 125 mph(200 km/h)
•Pilot Assist can provide steering assistancefrom very low speeds up to approx. 87 mph(140 km/h).
Never exceed posted speed limits.

WARNING
•Pilot Assist is not a collision avoidancesystem. The driver must react if the sys-tem does not detect another vehicle.
•Pilot Assist does not react to people, ani-mals, stationary objects, small vehicles(such as bicycles and motorcycles), lowtrailers and slow moving, parked orapproaching vehicles.
•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.
NOTE
•Pilot Assist maintenance should only becarried 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.

DRIVER SUPPORT
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307

Pilot Assist overview
Controls
Function buttons and symbols (generic illustration)
Increase set speed or resume Pilot Assist setspeed and distance (time interval) to thevehicle ahead
Press to activate Pilot Assist or put it instandby mode
Change from Pilot Assist to Adaptive CruiseControl
Reduce set speed
Increase the distance (time interval) to thevehicle ahead
Change from Adaptive Cruise Control to PilotAssist
Reduce the distance (time interval) to thevehicle ahead
Function symbol
Distance and target vehicle symbol
Steering assistance symbol

Instrument panel
Speed indication (generic illustration)
Set speed
Speed of the vehicle ahead
Your vehicle's current speed.
See also the article "Pilot assist symbols andmessages" for additional information.
Collision warning
Warning light in the windshield
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 PilotAssist can provide and if the driver does notapply the brakes, an audible signal and warninglight will illuminate in the windshield to alert thedriver 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.

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DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.308

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.

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 thedriver.
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
•Pilot Assist* (p. 295)
•Starting and activating Pilot Assist-2(p. 308)
•Changing Pilot Assist-2 speed (p. 310)
•Setting a Pilot Assist-2 time interval (p. 311)
•Changing target vehicles and automaticbraking with Pilot Assist-2 (p. 314)
•Deactivating/resuming Pilot Assist (p. 312)
•Passing Assistance with Adaptive CruiseControl or Pilot Assist-2 (p. 289)
•Pilot Assist-2 limitations (p. 315)
•Pilot Assist-2 symbols and messages(p. 317)
•Adaptive Cruise Control (ACC)* (p. 281)
•Distance Alert* (p. 279)
•Head-up display (HUD)* (p. 122)
•Radar sensor limitations (p. 319)
•Camera limitations (p. 323)
Starting and activating Pilot Assist-2
Pilot Assist has to be started and then activatedbefore it can provide steering assistance andregulate speed and the distance to the vehicleahead.
Function buttons and symbols

DRIVER SUPPORT
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Prerequisites
The prerequisites for activating Pilot Assist are:
•The driver's seat belt must be buckled andthe driver's door must be closed.
•There must be a vehicle ahead (a target vehi-cle) within a reasonable distance or yourvehicle's current speed must be at least9 mph (15 km/h).
With ACC in standby mode:
1.Tap ▶ (6).
>The symbol will change to PilotAssist in standby mode (8).
2.Press the button (2) on the left-sidesteering wheel keypad.
>Pilot Assist will go into active mode andthe current speed will be stored and dis-played in the center of the speedometer.
or
If Adaptive Cruise Control has been started:
–Tap ▶ (6).
>Pilot Assist will start.
Pilot Assist's steering assis-tance is only active when thesteering wheel symbol (2)changes from GRAY to WHITE.
And Pilot Assist will only regulate the time inter-val to the vehicle ahead when a vehicle symbol(1) is displayed above the steering wheel.
At the same time, a speedinterval will be marked.
The higher speed is the onestored by the driver and thelower one is the speed of thevehicle ahead (target vehicle).

WARNING
Pilot Assist is not a collision avoidance sys-tem. The driver is always responsible forsteering or applying the brakes if the systemdoes not detect another vehicle.
Do not use Pilot Assist in demanding drivingconditions such as city driving or other heavytraffic situations, in slippery conditions, whenthere is a great deal of water or slush on theroad, during heavy rain or snow, in poor visibil-ity, on winding roads or on highway on- or off-ramps.
In certain situations, it may be difficult for PilotAssist to assist the driver correctly or to deac-tivate automatically. In such cases, it is advisa-ble not to use Pilot Assist. Examples of suchsituations may be:
•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.
•there are edges or other lines on or nearthe lane, e.g., curbs, cracks, repairedareas, sharp shadows, etc.
•the lane is narrow or winding.

DRIVER SUPPORT
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* Option/accessory, for more information, see Introduction.313
In standby mode, the driver will have to regulatethe vehicle's speed and the distance to the vehi-cle ahead.
When Pilot Assist is in standby mode and yourvehicle comes too close to another vehicle, thedriver will be alerted by the Distance Alert func-tion.

Standby mode due to action by the driver
Pilot Assist is temporarily deactivated and put instandby mode if:
•the brakes are applied
•The gear selector is moved to N
•the turn signals are used for more than1 minute
•the vehicle is driven faster than the setspeed for more than 1 minute.
A temporary increase in speed, such as whenpassing another vehicle, does not affect the PilotAssist set speed. The vehicle will return to the setspeed when the accelerator pedal is released.
When the turn signals are used, Pilot Assist'ssteering function will be temporarily deactivated.When this is no longer the case, the steeringfunction will reactivate if the traffic lane's sidemarker lines can still be detected.

Automatic standby mode
Pilot Assist interacts with other systems, such asElectronic Stability Control. If any of these other
systems are not functioning properly, Pilot Assistwill automatically be deactivated.
WARNING
If this happens, the driver will be alerted by anaudible 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 standbymode if:
•the vehicle's speed is below approx. 3 mph(5 km/h) and Pilot Assist cannot determine ifa vehicle ahead is a stationary vehicle or anobject.
•the vehicle's speed is below approx. 3 mph(5 km/h) and the vehicle ahead turns so thatPilot Assist no longer has a vehicle to follow(target vehicle).
•the driver's hands are not on the steeringwheel
•the driver's door is opened
•the driver unbuckles the seat belt
•engine speed (rpm) is too high/low
•the wheels lose traction
•brake temperature is too high
•the parking brake is set
•The camera lens/radar sensor is covered bye.g., wet snow or if heavy rain interferes withradar waves

Reactivating Pilot Assist from standby
mode
Generic illustration
–Press the button (1).
>The most recently set speed will be used.

WARNING
There may be a significant increase in speed
after the button has been pressed.

Related information
•Pilot Assist* (p. 295)
•Pilot Assist-2* (p. 305)
•Starting and activating Pilot Assist-2 (p. 308)

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.314
•Changing Pilot Assist-2 speed (p. 310)
•Setting a Pilot Assist-2 time interval (p. 311)
•Changing target vehicles and automaticbraking with Pilot Assist-2 (p. 314)
•Passing Assistance with Adaptive CruiseControl or Pilot Assist-2 (p. 289)
•Pilot Assist-2 limitations (p. 315)
•Pilot Assist-2 symbols and messages(p. 317)
•Distance Alert* (p. 279)
Changing target vehicles andautomatic braking with PilotAssist-2
At certain speeds, Pilot Assist can change targetvehicles and automatically apply the brakes.

Changing target vehicles
If the target vehicle turns suddenly, there may be a sta-tionary vehicle ahead
When Pilot Assist is actively following anothervehicle at speeds under 20 mph (30 km/h) andchanges targets from a moving vehicle to a sta-tionary one, the system will brake for the station-ary vehicle.
WARNING
If Pilot Assist changes targets from a movingvehicle to a stationary one at speeds above20 mph (30 km/h), the system will not reactto the stationary vehicle and will accelerate tothe previously set speed.
The driver must actively apply the brakes toslow/stop the vehicle.

Automatic standby mode when changing
targets
Pilot Assist disengages and goes into standbymode if:
•your vehicle's speed goes below approx.3 mph (5 km/h) and Pilot Assist cannotdetermine if the target object is a stationaryvehicle or some other type of object such asa speed bump, etc
•the vehicle's speed goes below approx.3 mph (5 km/h) and the vehicle aheadchanges lanes or turns so that Pilot Assistno longer has a target vehicle to follow

Auto-hold brake function
In 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, Pilot Assist will go into standby mode andthe auto-hold brake function will activate.