2017 VOLVO XC90 TWIN ENGINE HYBRID brake

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DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.290

WARNING
If ACC changes targets from a moving vehicleto a stationary one at speeds above 20 mph(30 km/h), the system will not react to thestationary vehicle and will accelerate to thepreviously set speed.
The driver must actively apply the brakes toslow/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 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, ACC will go into standby mode and theauto-hold brake function will activate.
–The driver will then have to reactivate ACC inone of the following ways:
•Press the button on the left-sidesteering wheel keypad.
•Press the accelerator pedal.
>ACC will resume following the vehicleahead (target vehicle) if it begins to movewithin approx. 6 seconds.
NOTE
ACC can keep the vehicle at a standstill forup to 5 minutes, after which the parking brakewill be set and ACC will go into standbymode.
The parking brake has to be released beforeACC 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 ACC will gointo 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 ACC 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 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. 281)
•Auto-hold brake function (p. 379)
•Parking brake (p. 382)

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.292
Adaptive Cruise Control (ACC) -limitations
Adaptive Cruise Control (ACC) functionality maybe limited in certain situations.

Steep roads and/or heavy loads
Adaptive Cruise Control is primarily intended foruse 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 thevehicle is transporting a heavy load or if it is tow-ing a trailer.

Additional information
•The Off Road drive mode cannot beselected 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. 281)
•Radar sensor limitations (p. 319)
•Camera limitations (p. 323)

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DRIVER SUPPORT
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If the camera and radar sensor cannot detect thelane's side marker lines or a vehicle ahead, PilotAssist goes into standby mode.
When Pilot Assist is in standby mode and yourvehicle comes too close to the vehicle ahead, thedriver will be alerted by the Distance Alert func-tion.

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 speedsmoothly 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 increasesspeed to over 30 mph (50 km/h) and pullsaway from your vehicle, Pilot Assist will gointo standby mode.

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.
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.

DRIVER SUPPORT
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297

Pilot Assist overview
Controls
Function buttons and symbols
Activates Pilot Assist when the vehicle iskept at a standstill by the auto-hold brakefunction
Press to activate Pilot Assist or put it instandby mode
Change from Pilot Assist to Adaptive CruiseControl (symbol (8) will also change)
Not in use
Increase the distance (time interval) to thevehicle ahead
Change from Adaptive Cruise Control to PilotAssist (symbol (8) will also change)
Reduce the distance (time interval) to thevehicle ahead
Function symbols
Symbols for the time interval and the vehicleahead

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 PilotAssist 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.

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DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.298

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.
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* (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)
•Automatic braking with Pilot Assist-1(p. 303)
•Pilot Assist-1 limitations (p. 304)
•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-1*
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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299

Prerequisites
The 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 thatPilot Assist has been selected.
In other cases, the WHITEarrow 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 ▶ (6).
>The symbol will be displayed and PilotAssist will go into standby mode.
2.Press the button (2) on the left-sidesteering wheel keypad.
>Pilot Assist will go into active mode.

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.

Hands on the steering wheel
Pilot Assist only functions when the driver'shands are on the steering wheel, which is con-tinuously monitored by the system. If this is notthe case, the driver will be alerted by a text mes-sage in the instrument panel. If the driver's handsare not returned to the steering wheel, an audiblesignal will sound.
If the driver does not return his/her hands to thesteering wheel after the audible signal, PilotAssist will go into standby mode and must be
reactivated by pressing .

DRIVER SUPPORT
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* Option/accessory, for more information, see Introduction.301

WARNING
•Only use a time interval that is suitable incurrent traffic conditions.
•A short time interval gives the driver lim-ited reaction time if an unexpected situa-tion occurs in traffic.

Related information
•Pilot Assist* (p. 295)
•Pilot Assist-1* (p. 295)
•Starting and activating Pilot Assist-1*(p. 298)
•Deactivating/resuming Pilot Assist-1(p. 301)
•Automatic braking with Pilot Assist-1(p. 303)
•Pilot Assist-1 limitations (p. 304)
Deactivating/resuming PilotAssist-1
Pilot Assist can be temporarily deactivated, putin standby mode and then reactivated.
Putting Pilot Assist in standby mode
Function buttons and symbols (generic illustration)
1.Press the button (2).
>Pilot Assist will go into standby mode andsymbol (8) in the instrument panel willchange from WHITE to GRAY.
2.Press the ◀ button (3).
> Pilot Assist will be turned off and shift toACC in standby mode.
or
–Press the ◀ button (3).
>Pilot Assist will be turned off and switchto ACC in active mode.
Standby mode due to driver action
If a turn signal is used or if the accelerator pedalis 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 bedone 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 modeif:
•the brakes are applied
•the gear selector is moved to the N position.
The driver will then have to regulate speed anddistance to the vehicle ahead, or reactivate Pilot
Assist manually by pressing the button onthe left-side steering wheel keypad.

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DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.302

Automatic standby mode
Pilot Assist interacts with other systems, such asElectronic 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 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 camera cannot detect the traffic lane'sside 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 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
Function buttons and symbols
–Press the button (2).
>The most recently set speed will be usedand symbol (8) in the instrument panelwill change from WHITE to GRAY.

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)
•Automatic braking with Pilot Assist-1(p. 303)
•Pilot Assist-1 limitations (p. 304)
•Adaptive Cruise Control (ACC)* (p. 281)
•Distance Alert* (p. 279)