steering VOLVO V90 2017 Repair Manual

DRIVER SUPPORT
* Option/accessory.295
Managing the speed of the adaptive cruise control *
The adaptive cruise control (Adaptive Cruise Control -ACC) can be set to different speeds.
NOTE: The illustration is schematic - details may vary depending on car model.
–Change the stored speed with short or long presses on steering wheel button
(1) or
- (3):
• Use
short presses to adjust +/- 5 km/h
(+/- 5 mph) with each press.
• Hold the button depressed
to adjust
+/- 1 km/h (+/- 1 mph) and release
when the driver display's marking (4) is at
the desired speed .
> The speed set after the last press is stored in the memory. If the driver increases the car

DRIVER SUPPORT
* Option/accessory.
296
Setting the time interval for the adaptive cruise control *
The adaptive cruise control (Adaptive Cruise Control -ACC) can be set to different time inter-vals.
Different time intervals to the vehicle in front can be selectedand shown in the driver displayas 1-5 horizontal lines - themore lines the longer the timeinterval. One line representsabout 1 second to the vehicle
in front, 5 lines represents about 3 seconds. The same symbol is also shown when the Dis- tance Warning function is activated.
NOTE
When the symbol in the driver display shows two cars, ACC is following the vehicle in frontat a pre-set time interval. When only one car is shown, there is no vehi- cle within a reasonable distance ahead.
Control for time interval.
Decrease time interval
Increase time interval
Distance indicator
–Press the steering wheel button (1) or (2) to increase or decrease the time interval.
> The distance indicator (3) shows the cur- rent time interval.
The adaptive cruise control allows the time inter- val to vary significantly in certain situations inorder to allow the car to follow the vehicle in frontsmoothly and comfortably. At low speed, whenthe distances are short, the adaptive cruise con-trol increases the time interval slightly. Note that a short time interval only allows the driver a short time to react and take action if anyunforeseen problem should arise.
NOTE
Only use the time intervals permitted by local traffic regulations. If the adaptive cruise control does not appear to react when activated, this may be becausethe time distance to the vehicle in front is pre-venting an increase in speed. The higher the speed the longer the calcula- ted distance in metres for a given time inter-val.
Related information
• Adaptive cruise control
* (p. 290)
• Managing the speed of the adaptive cruise control
* (p. 295)
• Distance Warning
* (p. 288)

DRIVER SUPPORT
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* Option/accessory.297
Deactivating/activating the adaptive cruise control *
The adaptive cruise control (Adaptive Cruise Control - ACC) can be temporarily deactivatedso that it is set in the standby mode and canlater be reactivated.
Deactivate Adaptive Cruise Control and set it in standby mode
NOTE: The illustration is schematic - details may vary depending on car model.
To temporarily switch off Adaptive Cruise Control and set it in standby mode:
–Press the steering wheel button (2).
> The
symbol on the driver display
changes colour from WHITE to GREY and the stored speed in the centre of thespeedometer changes from BEIGE toGREY. In standby mode, the driver must him/herselfcontrol both speed and distance. When the adaptive cruise control is in standby mode and the car drives too close to a vehicleahead, the driver is warned about the short dis-tance by the Distance Warning function instead(see reference to the heading "Distance Warn-ing" at the end of this section).
Standby mode on driver intervention
The adaptive cruise control is temporarily deacti- vated and set in standby mode if:
• the foot brake is used
• the gear selector is moved to
N position.
• the driver maintains a speed higher than thestored speed for longer than 1 minute.
• the clutch pedal is depressed for approx. 1minute - applies to cars with manual gearbox.
In this situation, the driver must intervene andadapt the speed and distance to the vehicleahead. A temporary increase in speed with the accelera- tor pedal, e.g. during overtaking, does not affectthe setting - the car returns to the last storedspeed when the accelerator pedal is released.
Automatic standby mode
Adaptive cruise control is dependent on other systems, e.g. stability control/anti-skid ESC. If anyof these systems stops working, adaptive cruisecontrol is switched off automatically. In the event of automatic deactivation a signal willsound and a message is shown in the driver dis-play. The driver must then intervene and adaptthe speed and distance to the vehicle ahead. Automatic deactivation may occur if:
• the speed is below 5 km/h (3 mph) and ACC is uncertain whether the vehicle ahead is astationary vehicle or an object, such as aspeed bump.
• the speed is below 5 km/h (3 mph) and thevehicle ahead turns off so that ACC nolonger has a vehicle to follow.
• speed is reduced to below 30 km/h(20 mph) - only applies to cars with manualgearbox.
• the driver opens the door
• the driver takes off the seatbelt
• engine speed is too low/high
• wheels lose traction
• brake temperature is high
• the parking brake is applied
• the camera and radar unit is covered by e.g.snow or heavy rainfall (camera lens/radiowaves are blocked).

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DRIVER SUPPORT
* Option/accessory.
298
Reactivating adaptive cruise control from standby mode
NOTE: The illustration is schematic - details may vary depending on car model.
To reactivate ACC from standby mode:
–Press the steering wheel button (1).
> The speed is then set to the most recently stored speed.
NOTE
A marked speed increase may occur once the speed has been resumed by pressing steer- ing wheel button
.
Related information
• Adaptive cruise control
* (p. 290)
• Distance Warning
* (p. 288)
Overtaking assistance with the adaptive cruise control * or
Pilot Assist *
Adaptive cruise control (Adaptive Cruise Control - ACC) or Pilot Assist can assist the driver whenovertaking other vehicles.
When ACC or Pilot Assist is following another vehicle and the driver indicates the intention to overtake by activating the direction indicator
6
,
adaptive cruise control or Pilot Assist helps byaccelerating the car towards the vehicle aheadbefore the car reaches the overtaking lane. The function then delays reducing speed in order to avoid premature braking when the driver

DRIVER SUPPORT
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* Option/accessory.299
–Activate the direction indicator. Use the left direction indicator in a car with the steering wheel on the left, or the rightdirection indicator in a car with the steeringwheel on the right.
> Overtaking assistance is started.
LimitationsWhen using Overtaking Assistance the driver should be prepared for sudden changes in condi-tions. In some conditions Overtaking Assistancecan cause unwanted acceleration. Some situations should be avoided for this rea- son. Examples of such situations are:
• the car is approaching an exit road in orderto turn off in the same direction that is nor-mally used for overtaking
• the vehicle in front slows before your car hasentered the overtaking lane
• traffic in the overtaking lane is slowing
• a car designed for right-hand traffic is beingdriven in a country with left-hand traffic (orvice versa).
Situations of this kind can be avoided by tempo-rarily setting ACC or Pilot Assist in standby mode.
Related information
• Pilot Assist
* (p. 304)
• Adaptive cruise control
* (p. 290)
Change of target and automatic braking with the Adaptive CruiseControl
In combination with automatic gearbox, the adaptive cruise control (Adaptive Cruise Control- ACC ) has functionality for change of targetand braking at certain speeds.
Change of target
If the target vehicle in front suddenly turns then there may be stationary traffic in front.
When the adaptive cruise control is following another vehicle at speeds below 30 km/h
(20 mph) and the target is changed from a mov- ing vehicle to a stationary vehicle, the adaptivecruise control will brake for the stationary vehicle.
WARNING
When the adaptive cruise control is following another vehicle at speeds in excess of
approx. 30 km/h (20 mph) and the target is changed from a moving vehicle to a stationaryvehicle, the adaptive cruise control will ignorethe stationary vehicle and instead select thestored speed.
• The driver must then intervene him/ herself and brake.
Automatic standby mode with change of target
The adaptive cruise control is disengaged and set in standby mode: • when the speed is below 5 km/h (3 mph) and the adaptive cruise control is uncertainwhether the target object is a stationary vehi-cle or some other object, such as a speedbump.
• when the speed is below 5 km/h (3 mph)and the vehicle ahead turns off so the adap-tive cruise control no longer has a vehicle tofollow.
Automatic brakingFor shorter stops in connection with inching inslow traffic or at traffic lights driving is automati-cally resumed if the stops do not exceed about3 seconds - if it takes longer before the car in
6
On left flash only in left-hand-drive car, or right flash in right-hand-drive car.

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DRIVER SUPPORT
* Option/accessory.
300 front starts moving again then the adaptive cruise control is set in standby mode with automaticbraking.
–The Adaptive Cruise Control is reactivated in one of the following ways:
• Press the steering wheel button
.
• Depress the accelerator pedal.
> The Adaptive Cruise Control resumes fol- lowing the vehicle ahead if it starts mov- ing forward within 6 seconds.
NOTE
ACC can keep the car stationary for a maxi- mum of 5 minutes. After this the parkingbrake is applied and adaptive cruise control isdisengaged. The parking brake must be released before the adaptive cruise control can be reactivated.
Cessation of automatic braking
In some situations, automatic braking ceases on reaching 0 km/h and Adaptive Cruise Control isset in standby mode. This means that the brakesare released and the car may start to roll - thedriver must therefore intervene and brake the carhimself/herself to keep it stationary. This may take place in the following situations:
• the driver puts his/her foot on the brakepedal
• the parking brake is applied
• the gear selector is moved to
P, N , or R posi-
tion
• the driver sets the adaptive cruise control inthe standby mode.
Automatic activation of parking brakeIn certain situations the parking brake is appliedto keep the car stationary. This takes place if the adaptive cruise control is holding the car stationary with the foot brake and: •the driver opens the door or takes off his/her seatbelt
• ACC has kept the car stationary for morethan approx. 5 minutes
• the brakes have overheated
• the engine is switched off.
Related information
•
Adaptive cruise control
* (p. 290)
Limitations of the adaptive cruise control *
The (Adaptive Cruise Control - ACC) may have limitations in certain situations.
Steep roads and/or heavy loadBear in mind that the adaptive cruise control is primarily intended for use when driving on levelroad surfaces. The function may have difficulty inkeeping the correct distance from the vehicleahead when driving on steep downhill slopes - inwhich case, be extra attentive and ready to brake.Do not use the adaptive cruise control with aheavy load or with a trailer connected to the car.
Miscellaneous
• Drive mode Off Road cannot be selected
when the adaptive cruise control is activated.
NOTE
The function uses the car's radar unit, which has some general limitations, see the "Limita-tions for radar unit" section.
Related information
• Adaptive cruise control
* (p. 290)
• Limitations of the radar unit (p. 319)

DRIVER SUPPORT
* Option/accessory.301
Change between Cruise control and adaptive cruise control *
In a car with Adaptive Cruise Control (ACC) the driver can change between Cruise Control (CC)and ACC.
A symbol in the driver display shows which cruise control is active:
CC
Cruise Control ACC
Adaptive Cruise Control
AA
Cruise control Adaptive cruise control
A WHITE symbol: Function active, GREY symbol: Standby mode
Changing from ACC to CCHow to change from Adaptive Cruise Control (ACC) to Cruise Control (CC):
1. Set adaptive cruise control in standby mode
using the
steering wheel button.
2. Tap on the
Cruise control button in the
function view - the button's indicator changes colour from GREY to GREEN.
> The symbol in the driver display changes
from
ACC to CC. Adap-
tive Cruise Control (ACC) is now switched off and Cruise Control (CC) is set instandby mode. 3.
Press the steering wheel button
.
> Cruise control starts and stores the cur- rent speed.
WARNING
The car no longer maintains the preset time interval after switching from ACC to CC - itmerely follows the set speed.
If CC is active when the engine is switched off, ACC will be activated the next time the engine isstarted.
Changing from CC to ACCProceed as follows to change from cruise control(CC) to adaptive cruise control (ACC):
1. Set cruise control in standby mode using the
steering wheel button.
2. Tap on the
Cruise control button in the
function view - the button's indicator changes colour from GREEN to GREY.
> The symbol in the driver display changes
from
CC to ACC. Adap-
tive Cruise Control is set in standby mode.
3. Press the steering wheel button
.
> Adaptive cruise control starts and stores the current speed, together with the pre- set time interval to the vehicle ahead.
Related information
• Cruise control (p. 284)
• Adaptive cruise control
* (p. 290)

DRIVER SUPPORT
* Option/accessory.
304
Pilot Assist *
Pilot Assist helps the driver to drive the car between the lane's side markings using steeringassistance as well as to maintain an even speed,combined with a preselected time interval to thevehicle ahead.
The Pilot Assist function gives more comfortable driving and a more relaxed driving experienceduring, for example, long journeys on motorwaysin even traffic flows.
The camera and radar unit measures the distance to the vehicle ahead and detects side markings 9
.
Camera and radar unit
Distance readers
Readers, side markings The driver selects the desired speed and a time interval to the vehicle ahead. Pilot Assist scansthe distance to the vehicle ahead and the lane'sside markings on the road surface using thecamera and radar unit. The preset time interval ismaintained with automatic speed adjustmentwhilst the steering assistance helps to positionthe car in the lane. Pilot Assist steering assistance takes into account the speed of the preceding car and thelane markings. The driver can at any time ignorethe Pilot Assist steering recommendation andsteer in another direction, e.g. to change lane oravoid an obstruction on the road. If Pilot Assist cannot interpret the lane unambig- uously, e.g. if the camera and radar unit does notsee the lane's side markings, Pilot Assist tempo-rarily deactivates steering assistance, butresumes it if the lane can be interpreted again -although the speed and distance control func-tions remain active.
NOTE
Pilot Assist steering assistance is deactivated and is resumed without prior warning.
The current status of steering assistance is indicated by thecolour of the steering wheel'ssymbol: • GREEN steering wheel indi- cates active steering assis-
tance • GREY steering wheel (as in illustration) indi- cates deactivated steering assistance.
9 NOTE: The illustration is schematic - details may vary depending on car model.

DRIVER SUPPORT
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305
WARNING
Pilot Assist is an aid which cannot handle all traffic, weather and road conditions. The driver must always be observant with regard to the prevailing traffic conditions andintervene if Pilot Assist does not provide suit-able steering assistance or maintain a suita-ble speed or suitable time interval. Read all the sections about this function in the owner's manual in order to learn about itslimitations, of which the driver should beaware before the function is used. Pilot Assist must only be used if there are clear lane lines painted on the road surfaceon each side of the lane. All other useinvolves increased risk of contact with sur-rounding obstacles that are not detected bythe function. The driver always bears responsibility for how the car is controlled as well as for maintainingthe correct distance and speed, even whenPilot Assist is being used.
Pilot Assist regulates the speed with acceleration and braking. It is normal for the brakes to emit alow sound when they are being used to adjustthe speed. Pilot Assist attempts to regulate the speed smoothly. In situations that demand sudden brak-ing the driver must brake himself/herself. Thisapplies in case of large speed differences or ifthe vehicle in front brakes suddenly. Due to the limitations of the camera and radar unit, brakingmay come unexpectedly or not at all. Pilot Assist aims to follow the vehicle ahead in the same lane at a time interval set by the driver.If the radar unit cannot see any vehicle in frontthen the car will instead maintain the speed setand stored by the driver. This also takes place ifthe speed of the vehicle ahead increases andexceeds the stored speed. The following applies for cars with automatic gearbox:
• Pilot Assist can follow another vehicle atspeeds from 0 km/h up to 200 km/h(125 mph).
• Pilot Assist can give steering assistance fromalmost stationary up to 140 km/h (87 mph).
The following applies for cars with manual gear-box: • Pilot Assist can follow another vehicle at speeds from 30 km/h (20 mph) up to200 km/h (125 mph).
• Pilot Assist can give steering assistance from30 km/h (20 mph) up to 140 km/h(87 mph).
WARNING
Pilot Assist is not a collision avoidance sys- tem. The driver must intervene if the systemdoes not detect a vehicle in front. Pilot Assist does not brake for people, ani- mals, objects, small vehicles (e.g. cycles andmotorcycles), low trailers as well as oncoming,slow or stationary vehicles. Do not use Pilot Assist, for example, in city traffic, at junctions, on slippery surfaces, witha lot of water or slush on the road, in heavyrain/snow, in poor visibility, on winding roads,on slip roads, or with a trailer connected tothe car.
IMPORTANT
Maintenance of Pilot Assist components must only be performed at a workshop - an author-ised Volvo workshop is recommended.

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DRIVER SUPPORT
306
Overview
Controls
Buttons and symbols for functions9
.
Increases stored speed or reactivates Pilot Assist and resumes stored speed and timeinterval
Activates/deactivates Pilot Assist
Switches from Pilot Assist to adaptive cruise control
Reduces stored speed
Increases the distance to vehicles ahead
Switches from adaptive cruise control to Pilot Assist
Reduces the distance to vehicles ahead
Function symbol
Symbols for target vehicle and time interval to vehicles ahead
Symbol for activated/deactivated steering assistance
Driver display
Indication of speeds 9
.
Stored speed
Speed of vehicle ahead.
Current speed of your car.
To see different combinations of symbols depending on traffic situation - see the heading"Symbols and messages for Pilot Assist".
Collision risk warning
Audio and symbol for collision warning 9
Acoustic warning signal in the event of a risk of collision
Warning signal in the event of a risk of colli- sion
Distance measurement with the camera and radar unit
Pilot Assist uses approx. 40% of the foot brake'scapacity. If the car needs to be braked moreheavily than Pilot Assist is capable of and thedriver does not brake, the warning lamp andacoustic warning are activated to alert the driverthat immediate intervention is required.
9 NOTE: The illustration is schematic - details may vary depending on car model.