brake VOLVO XC90 TWIN ENGINE 2020 Workshop Manual

DRIVER SUPPORT
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* Option/accessory.341
Rear Collision Warning *63
The Rear Collision Warning 64
(RCW) function
can help the driver avoid rear-end collisions from vehicles approaching from behind.
The function can alert drivers of following vehi- cles of the risk of a collision by rapidly flashingthe turn signals. If, at a speed below 30 km/h (20 mph), the function detects that the vehicle is in dangerof being hit from behind, the seat belt tension-ers may tension the front seat belts. TheWhiplash Protection System will also be acti-vated in a collision. Immediately before a collision from behind, the function may also activate the brakes inorder to reduce the forward acceleration of thevehicle during the collision. However, thebrakes will only be applied if your vehicle isstationary. The brakes will be immediatelyreleased if the accelerator pedal is depressed. The function is automatically activated each time the engine is started.
WARNING
The function is supplementary driver support intended to facilitate drivingand help make it safer – it cannot han-dle all situations in all traffic, weatherand road conditions.
The driver is advised to read all sec-tions in the Owner's Manual about thisfunction to learn of its limitations,which the driver must be aware ofbefore using the function.
Driver support functions are not a sub-stitute for the driver's attention andjudgment. The driver is always respon-sible for ensuring the vehicle is drivenin a safe manner, at the appropriatespeed, with an appropriate distance toother vehicles, and in accordance withcurrent traffic rules and regulations.
Related information
Driver support systems (p. 280)
Rear Collision Warning
* limitations
(p. 341)
Whiplash Protection System (p. 48)
Rear Collision Warning
*65
limitations
In some situations, it may be difficult for Rear Collision Warning (RCW) to warn the driverof a collision risk.
This may be the case if: the vehicle approaching from the rear is detected at a late stage
the vehicle approaching from the rearchanges lanes at a late stage
a trailer, bicycle holder or similar is con-nected to the vehicle's electrical system -the function will then be automaticallydeactivated.
NOTE
In certain markets RCW does
not warn
with the direction indicators due to local traffic regulations – in such cases, that partof the function is deactivated.
63 Warning of collision from the rear.
64 This function is not available on all markets.
65 Warning of collision from the rear.

DRIVER SUPPORT
* Option/accessory.
346
Cross Traffic Alert *71
Cross Traffic Alert(CTA) is a supplementary driver support system to BLIS 72
that is
intended to help the driver detect vehicles crossing behind the vehicle while backing up. The auto-brake subfunction can help the
driver stop the car if there is a risk of collision with an unobserved vehicle.
Examples of areas in which CTA can help the driver detect obstacles while backing up.
CTA supplements BLIS by detecting traffic crossing from the side, e.g. when backing outof a parking space. CTA is primarily designed to detect vehicles, but in certain cases can also detect pedes-trians or smaller objects such as bicycles. CTA is only active when the vehicle is movingbackward or if reverse gear is engaged. If CTA detects that something is approaching your vehicle from the side:
an audible signal will sound from eitherthe left or right speaker, depending onwhich side of your vehicle the object isapproaching from.
an icon will illuminate in the
Park Assist
System graphic on the screen.
an icon will appear in the Park Assist Cam- era's Top view.
Illuminated CTA icon in the
Park Assist System
graphic on the screen.
If the driver does not pay attention to the warning from CTA and a collision is unavoida- ble, the
auto brake function will intervene to
stop the vehicle and a text will be shown onthe instrument panel to explain why the vehi-cle was braked.
WARNING
The function is supplementary driver support intended to facilitate drivingand help make it safer – it cannot han-dle all situations in all traffic, weatherand road conditions.
The driver is advised to read all sec-tions in the Owner's Manual about thisfunction to learn of its limitations,which the driver must be aware ofbefore using the function.
Driver support functions are not a sub-stitute for the driver's attention andjudgment. The driver is always respon-sible for ensuring the vehicle is drivenin a safe manner, at the appropriatespeed, with an appropriate distance toother vehicles, and in accordance withcurrent traffic rules and regulations.
71
Warning for crossing traffic when the vehicle is backing up.
72 Blind Spot Information

DRIVER SUPPORT
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* Option/accessory.347
Related information
Driver support systems (p. 280)
Activating or deactivating Cross Traffic Alert
* (p. 347)
Cross Traffic Alert
* limitations (p. 347)
Cross Traffic Alert
* messages (p. 349)
BLIS
* (p. 342)
Park Assist
* (p. 370)
Activating or deactivating Cross Traffic Alert *73
The driver can select to switch off the warn-
ing in the function Cross Traffic Alert (CTA) –
the sub-function auto brake cannot be
switched off and continues to be active.
Activate or deactivate the function using this button inthe center display's Functionview.
GREEN button indicator light – the func- tion is activated.
GRAY button indication – warning signaland indication on display for the functionis deactivated.
The function is automatically activated eachtime the engine is started.
Related information
Cross Traffic Alert
* (p. 346)
Cross Traffic Alert
* limitations (p. 347)
Cross Traffic Alert *74
limitations
The Cross Traffic Alert (CTA) function with auto brake may have limited functionality in
certain situations. Auto-brake is active atspeeds under 15 km/h (9.3 mph).
WARNING
The auto-brake sub-function can only
detect and apply the brakes for other mov- ing vehicles – not for e.g. stationary obsta-
cles, cyclists or pedestrians.
CTA has certain limitations – The CTA sen- sors, for example, cannot "see" through otherparked vehicles or objects blocking the vehi-cle. Below are a few examples of situations in which CTA's field of vision may be initially lim-ited and approaching vehicles may thereforenot be detected until they are very close toyour vehicle:
73 Warning for crossing traffic when the vehicle is backing up.
74 Warning for crossing traffic when the vehicle is backing up.

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DRIVER SUPPORT
* Option/accessory.
348
The vehicle is parked very far into a parking space.
In a diagonal parking space, CTA may be completely "blind" on one side of your vehicle.
CTA's blind zone.
CTA's field of vision.
However, as you back your vehicle slowly out of a parking space, CTA's field of vision changes in relation to the obstructing vehicle/object and its blind zone is reduced.
Examples of further limitations

The
auto brake sub-function only detects
vehicles in motion and may therefore not
"see" and brake for e.g. stationary obsta- cles, a cyclists or a pedestrian.
Dirt, ice and snow covering the sensorsmay reduce functionality and prevent thesystem from providing warnings.
CTA is automatically deactivated if atrailer, bicycle holder or similar is con-nected to the vehicle's electrical system.
For CTA to function effectively, bicycleholders, luggage racks or similar shouldnot be mounted on the vehicle's towbar.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Related information

Cross Traffic Alert
* (p. 346)
Camera/radar sensor limitations (p. 322)

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DRIVER SUPPORT
366
Steering assistance with braking
Intervention with steering assistance and braking.
Braking intervention assists in situations where steering assistance alone is not suffi-cient. Braking force is automatically adaptedaccording to the situation at the moment thevehicle begins to run off the road. The function is active at speeds between 65-140 km/h (40-87 mph) on roads withclearly visible traffic lane markings/lines. The system uses a camera to monitor the edges of the road and the painted side markerlines. If the vehicle is about to cross the edgeof the road, the function will attempt to steerthe vehicle back onto the road. If this is notsufficient to keep the vehicle on the road, thebrakes will also be applied. However, the function will not provide either
steering assistance or braking if the turn signal is used. The function will also not be activated if it detects that the driver is actively operatingthe vehicle.
Related information

Steering assistance at risk of collision(p. 364)
Steering assistance during collision riskslimitations (p. 368)
Steering assistance during collision risks from oncomingtraffic Steering assistance has several sub-func- tions. Steering assistance during collisionrisks from oncoming traffic can help a dis-tracted driver who has not noticed that thevehicle is veering out of the lane.
The function provides assistance by swerving your vehicle back into your own lane.
Oncoming vehicles
Own vehicle
When steering assistance is activated, colli- sion warning for driver support will also beactivated. However, the brake pedal pulsa-tions that are part of collision warning will notbe activated.

DRIVER SUPPORT
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* Option/accessory.371
Park Assist front, rear and sides *
Park Assist behaves differently depending on which part of the vehicle is approaching anobstacle.
Front camera
The warning signal has a continuous tone when the obstacle is less than approx. 30 cm (1 ft) from thevehicle.
The Park Assist system's front sensors are automatically activated when the engine isstarted. They are active at speedsbelow 10 km/h (6 mph). The distance monitored extends approx. 80 cm (2.5 ft) in front of the vehicle.
NOTE
The Park Assist system is deactivated when the parking brake is used or when P
is selected on vehicles with automatictransmission.
CAUTION
When installing auxiliary lights: Make sure these do not obscure the sensors – theauxiliary lights could be perceived as anobstacle.
Back
The warning signal has a continuous tone when the obstacle is less than approx. 30 cm (1 ft) from thevehicle.
The rear sensors will be activated if the vehicle begins rolling backward or if reverse gear isengaged. The distance monitored extends approx. 1.5 meters (5 ft) behind the vehicle. The Park Assist system's rear sensors will be automatically deactivated if the vehicle isbacking up with a trailer connected to thevehicle's electrical system.
NOTE
When reversing with e.g. a trailer or bike carrier on the trailer hitch – without Volvooriginal trailer cables – the Parking Assistsystem may have to be turned off manuallyto prevent the sensors from reacting tothese.

DRIVER SUPPORT
* Option/accessory.373
CAUTION
Objects such as chains, thin and glossy poles or low obstacles may end up in the"signal shadow" and then go temporarilyundetected by the sensors – the pulsatingtone may then unexpectedly stop insteadof becoming a constant tone as expected. The sensors cannot detect high objects, such as protruding ramps. In such situations, pay extra attention and maneuver/drive the vehicle veryslowly or stop the current parkingmaneuver – there may be a high risk ofdamage to the vehicle or other objectssince information from the sensors isnot always reliable in such situations.
CAUTION
In some circumstances, the Park Assist System may produce false warnings due toexternal sound sources with the sameultrasonic frequencies as those the systemworks with. Examples of such sources are horns, wet tires on asphalt, pneumatic brakes, exhaustnoise from motorcycles, etc.
NOTE
When a trailer hitch is configured with the vehicle electrical system, the trailer hitchprotrusion is included when the functionmeasures the distance to objects behindthe vehicle.
Related information

Park Assist
* (p. 370)

DRIVER SUPPORT
* Option/accessory.
386
Using Park Assist Pilot *
Park Assist Pilot (PAP 102
) helps the driver
park using three different steps. The function can also help the driver pull out of a parkingspace.
The function measures the space and steers the vehicle. The driver's role is to:
keep close watch of the area around thevehicle
follow the instructions on the center dis-play
change gears (reverse/forward) – an audi-ble signal indicates when the driver needsto change gears
regulating and maintaining a safe speed
applying the brakes and stopping the vehi-cle.
Information about the actions required by thedriver are provided in the center display usingsymbols, graphics and/or text. The function can be activated if the following criteria have been met after the engine isstarted:
No trailer is hitched to the vehicle
Your vehicle's speed is lower than30 km/h (20 mph).
NOTE
The distance between the vehicle and parking spots should be 0.5–1.5 meters(1.6–5.0 ft) when the function is lookingfor parking.
Parking with Park Assist PilotThe function helps park the vehicle using the following steps:
1. The system searches for and measures
potential parking spaces.
2. The vehicle is steered while it is backing into the parking space.
3. The vehicle is positioned in the parking space (the driver may be prompted to shift gears and apply the brakes).
Searching and measuring potential parking spots
The function can be activated in the center display's Func-tion view. It can also be accessed from the camera views.
GREEN button indicator light – the func- tion is activated.
GRAY button indicator light – the functionis deactivated.
Parallel parking search overview.
Perpendicular parking search overview.
The vehicle's speed may not exceed 30 km/h (20 mph) when parallel parking or 20 km/h(12 mph) when perpendicular parking.
102
Park Assist Pilot

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DRIVER SUPPORT
* Option/accessory.
388
Positioning the vehicle in the parking space
Parallel parking positioning overview.
Perpendicular parking positioning overview.
1. Move the gear selector to the gear instruc-
ted by the system. Wait until the steering wheel turns and then drive slowly forward.
2. Be prepared to stop the vehicle when instructed to do so by a graphic and mes-sage in the center display.
3. Engage reverse gear and back up slowly.
4. Be prepared to apply the brakes when instructed to do so by a graphic and mes- sage in the center display.
The function will switch off automatically anda graphic and message will appear to indicatethat parking has been completed. Adjust-ments can always be made be the driver after-ward. Only the driver can determine when thevehicle is correctly parked.
CAUTION
The warning distance is shorter when the sensors are used by Park Assist Pilot (PAP 103
) compared to when they are used
by the Parking Assist system.
Auto-brake during a parking sequenceIf, while parking, the parking sensors detect a vehicle or pedestrian in the vehicle's intendeddirection of travel behind or in front of the vehicle, the auto-brake function will bring thevehicle to a standstill. A pop-up message will then appear in the instrument panel and the driver can tap
Cancel to cancel the parking sequence orResume to continue the parking sequence.
After selecting
Resume:
–Check that the area around the vehicle is free of obstructions and follow the instruc-tions on the center display, such as:
To continue – Gently accelerate away
from object.
Related information
Park Assist Pilot
* (p. 384)
Park Assist Pilot
* limitations (p. 389)
103
Park Assist Pilot

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DRIVER SUPPORT
390
The parking sequence is cancelledA parking sequence will be cancelled if: the driver moves the steering wheel
the vehicle's speed exceeds 7 km/h (4 mph)
the driver taps
Cancel in the center dis-
play
when the anti-lock brakes or the Elec- tronic stability control are engaged - e.g.when a wheel loses grip on a slippery road
when speed-dependent power steeringwheel resistance is working at reducedpower – e.g. during cooling due to over-heating.
when, while parking, the parking sensorsdetect a vehicle or pedestrian in the vehi-cle's intended direction of travel behind orin front of the vehicle, the auto-brake func-tion will bring the vehicle to a standstill.
A message in the center display will explainwhy the parking sequence was cancelled.
CAUTION
Under certain circumstances, the function may not be able to find parking spaces –one reason may be that the sensors aredisrupted by external sound sources thatemit the same ultrasonic frequencies thatthe system works with. Examples of such sources include horns, wet tires on asphalt, pneumatic brakes,exhaust noise from motorcycles, etc.
NOTE
Dirt, ice and snow covering the sensors reduce their function and can make meas-urement impossible.
Driver responsibilityThe driver should keep in mind that the func- tion is a parking aid ‒
not an infallible fully
automatic system. The driver must always beprepared to take control and cancel a parkingsequence if necessary. There are a number of things to keep in mindwhen parking, including:
The driver is always responsible for deter-mining if the space suggested by the func-tion is suitable for parking.
Do not use the function when using snowchains or a temporary spare tire.
Do not use the function if there are anyobjects protruding from the vehicle.
Heavy rain or snowfall may inhibit PAP'sability to accurately measure a parkingspace.
While searching and measuring the park-ing space, the function may be unable todetect objects located far into the space.
PAP may not suggest parking spaces onnarrow streets if it does not detect suffi-cient space for maneuvering the vehicle.
Use approved tires 105
inflated to the cor-
rect tire pressure because this affects thefunction's ability to provide parking assis-tance.
The function is based on the way the vehi-cles are parked behind and in front of yourparking space. If they are, for example,parked too close to the curb, there is a riskthat your vehicle's tires or wheel rims
105
"Approved tires" refers to tires of the same type and make as the vehicle's original, factory-installed tires.