light VOLVO V90 2017 Repair Manual

DRIVER SUPPORT
* Option/accessory.
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Speed-dependent steering force Speed related power steering causes the steer- ing wheel force to increase with the speed of thecar in order to give the driver enhanced sensitiv-ity.
On motorways the steering feels firmer. When parking and at low speed steering is light andrequires only a slight effort.
NOTE
In certain situations the power steering may become too hot and then needs to be tempo-rarily cooled - during this time the powersteering operates with reduced power andturning the steering wheel may then be per-ceived to be slightly heavier. In parallel with the temporarily reduced steer- ing assistance, the driver display shows amessage.
Change the steering force level *To select the steering force level, go to the "Drive modes" section and see the description at thealternative INDIVIDUAL under the heading"Selectable drive modes". For the car models without a drive mode control with its INDIVIDUAL option, the selection ofsteering force is instead made via the centre dis-play's top view and the following search path:
SettingsMy CarDrive ModesSteering force
Selection of steering force is not accessible while turning is in progress.
Related information
•Drive modes
* (p. 400)
Roll Stability Control Roll Stability Control (RSC) is a stabiliser sys- tem that minimises the risk of overturning, forexample during sudden evasive manoeuvres or ifthe car skids.
The RSC system registers if and how much the car's lateral inclination changes. This informationis used to calculate the risk of the car overturn-ing. If the car is at risk, its electronic stability con-trol system engages, the engine torque isreduced and one or more wheels are braked untilthe car has regained its stability.
WARNING
Under normal driving conditions, the RSC sys- tem improves the car's road safety, but thismust not be taken as a reason to increasespeed. Always follow the normal precautionsfor safe driving.
Related information
• Electronic stability control (p. 273)
• Safety (p. 56)

DRIVER SUPPORT
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275
Symbols and messages for electronic stability control
A number of symbols and messages regarding electronic stability control (Electronic Stability Control -ESC) can be shown on the driver dis-play.
The following table shows some examples.
Symbol
Message Specification
Constant glow for approx. 2 seconds. System check when the engine is started.
Flashing light. ESC system is being activated.
Constant glow. Sport mode is selected.
NOTE: The ESC system is not deactivated in this mode — it is partly reduced.
ESC Temporarily offESC system has been temporarily reduced due to excessive brake temperature - the function is reactiva- ted automatically when the brakes have cooled.
ESC Service requiredESC system disengaged.
• Stop the car in a safe place, switch off the engine and start it again.
• Visit a workshop if the message remains - an authorised Volvo workshop is recommended.

DRIVER SUPPORT
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Distance Warning *
The Distance Warning function (Distance Alert) warns the driver if the time interval to the vehicleahead becomes too short.
Distance warning is active at speeds
above 30 km/h (20 mph) and only reacts to thevehicle ahead travelling in the same direction. Nodistance information is provided for oncoming,slow or stationary vehicles.
NOTE
Distance warning is deactivated during the time the adaptive cruise control is active.
WARNING
Distance warning only reacts if the distance to the vehicle ahead is shorter than the presetvalue - the speed of the driver's vehicle is notaffected.
Head-up display *
Symbol for Distance Warning on the windscreen 4
.
In cars equipped with head-up display, a symbol is shown on the windscreen for as long as thetime interval to the vehicle ahead is shorter thanthe preset value. However, this presupposes that the
Show Driver Support function is activated
via settings in the car's menu system; see the heading "Head-up display" for how this works.
NOTE
Information on the windscreen may be diffi- cult to see in strong sunlight and when wear-ing sunglasses.
Related information
• Activating and setting the time interval for Distance warning
* (p. 289)
• Limitations of Distance Warning
* (p. 290)
• Head-up display
* (p. 112)
• Adaptive cruise control
* (p. 290)
4
NOTE: The illustration is schematic - details may vary depending on car model.

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Limitations of Distance Warning *
The Distance warning (Distance Alert) function may have limitations in certain situations.
NOTE
Strong sunlight, reflections or strong varia- tions in light intensity, as well as wearing sun-glasses, could mean that the warning light inthe windscreen cannot be seen. Poor weather or winding roads could affect the radar unit's capacity to detect vehicles infront. The size of other vehicles could also affect detection capacity, e.g. motorcycles. Thiscould mean that the warning lamp illuminatesat a shorter distance than the setting or thatthe warning is temporarily absent. Extremely high speeds can also cause the lamp to illuminate at a shorter distance thanthat set due to limitations in sensor range.
NOTE
The function uses the car's radar unit, which has some general limitations, see the "Limita-tions for radar unit" section.
Related information
• Distance Warning
* (p. 288)
• Activating and setting the time interval for Distance warning
* (p. 289)
• Limitations of the radar unit (p. 319)
Adaptive cruise control
*
The adaptive cruise control (Adaptive Cruise Control - ACC) helps the driver to maintain aneven speed combined with a pre-selected timeinterval to the vehicle ahead.
An adaptive cruise control provides a more relax- ing driving experience on long journeys on motor-ways and long straight main roads in smooth traf-fic flows.
The camera and radar unit measures the distance to the vehicle ahead 5
.
The driver selects the desired speed and a time interval to the vehicle ahead. If the camera andradar unit detects a slower vehicle in front of thecar, the speed is adapted automatically via thepreset time interval to the vehicle. When the road
5 NOTE: The illustration is schematic - details may vary depending on car model.

DRIVER SUPPORT
* Option/accessory.293
activated to alert the driver that immediate inter- vention is required.
WARNING
The adaptive cruise control only warns of vehicles which its radar unit has detected -hence a warning may not be given, or it maybe given with a certain delay. Do not wait for awarning without braking when so required.
Head-up display
*
Symbol for collision warning on the windscreen 5
.
In cars equipped with a head-up display, the warning is shown on the windscreen by a flashingsymbol.
NOTE
Information on the windscreen may be diffi- cult to see in strong sunlight and when wear-ing sunglasses.
Related information
• Activating and starting the adaptive cruise control
* (p. 294)
• Managing the speed of the adaptive cruisecontrol
* (p. 295)
• Setting the time interval for the adaptivecruise control
* (p. 296)
• Change of target and automatic braking with the Adaptive Cruise Control (p. 299)
• Change between Cruise control and adaptive cruise control
* (p. 301)
• Overtaking assistance with the adaptivecruise control
* or Pilot Assist * (p. 298)
• Deactivating/activating the adaptive cruisecontrol
* (p. 297)
• Limitations of the adaptive cruise control
*
(p. 300)
• Symbols and messages for the adaptivecruise control
* (p. 302)
• Pilot Assist
* (p. 304)
• Distance Warning
* (p. 288) •
Head-up display
* (p. 112)
• Limitations of the radar unit (p. 319)
5
NOTE: The illustration is schematic - details may vary depending on car model.

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.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.

DRIVER SUPPORT
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* Option/accessory.307
WARNING
Pilot Assist only gives warning about vehicles whose camera and radar unit has beendetected - therefore a warning may not occuror be delayed. Do not wait for a warning with-out braking when so required.
Head-up display *
Symbol for collision warning on the windscreen 9
.
In cars equipped with a head-up display, the warning is shown on the windscreen by a flashingsymbol.
NOTE
Information on the windscreen may be diffi- cult to see in strong sunlight and when wear-ing sunglasses.
Related information
• Activating and starting the Pilot Assist
*
(p. 307)
• Managing the speed for Pilot Assist
*
(p. 309)
• Setting the time interval for Pilot Assist
*
(p. 310)
• Change of target and automatic braking with Pilot Assist
* (p. 313)
• Deactivating/activating the Pilot Assist
*
(p. 311)
• Overtaking assistance with the adaptivecruise control
* or Pilot Assist * (p. 298)
• Limitations of Pilot Assist
* (p. 314)
• Symbols and messages for Pilot Assist
*
(p. 316)
• Adaptive cruise control
* (p. 290)
• Distance Warning
* (p. 288)
• Head-up display
* (p. 112)
• Limitations of the radar unit (p. 319)
• Limitations of the camera unit (p. 327)
Activating and starting the Pilot Assist
*
Pilot Assist must first be activated and then started to be able to control speed and distanceand to give steering assistance.
NOTE: The illustration is schematic - details may vary depending on car model.
In order to start the Pilot Assist it is required that:
• The driver's seatbelt must be buckled and the driver's door must be closed.
• There must be a vehicle (the "target vehicle")within reasonable distance in front of the car,or the current speed must be at least15 km/h (9 mph).
• For cars with manual gearbox. Speed mustbe at the lowest 30 km/h (20 mph).
9
NOTE: The illustration is schematic - details may vary depending on car model.

DRIVER SUPPORT
* Option/accessory.
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Setting the time interval for Pilot Assist *
Pilot Assist can be set with 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.
NOTE
When the symbol in the driver display shows a car and a steering wheel, Pilot Assist fol-lows a vehicle in front at a preset time gap. When only one steering wheel is shown, there is no vehicle within a reasonable distanceahead.
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.
In order to follow the vehicle ahead in a smooth and comfortable way, Pilot Assist allows the timeinterval to vary noticeably in certain conditions.For example, at low speed, when the distancesbecome short, Pilot Assist increases the timeinterval 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 Pilot Assist does not appear to react when activated, this may be because the time dis-tance to the vehicle in front is preventing anincrease in speed. The higher the speed the longer the calcula- ted distance in metres for a given time inter-val.
Related information
• Pilot Assist
* (p. 304)
• Activating and starting the Pilot Assist
*
(p. 307)
• Managing the speed for Pilot Assist
* (p. 309)
• Change of target and automatic braking with Pilot Assist
* (p. 313)
• Deactivating/activating the Pilot Assist
*
(p. 311)
• Overtaking assistance with the adaptivecruise control
* or Pilot Assist * (p. 298)
• Limitations of Pilot Assist
* (p. 314)
• Symbols and messages for Pilot Assist
*
(p. 316)
• Distance Warning
* (p. 288)

DRIVER SUPPORT
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* Option/accessory.313
Change of target and automatic braking with Pilot Assist *
In combination with automatic gearbox, Pilot Assist has functionality for change of target and braking at certain speeds.
Change of target
If the target vehicle in front suddenly turns then there may be stationary traffic in front.
When Pilot Assist is following another vehicle at speeds below 30 km/h (20 mph) and changes
target from a moving to a stationary vehicle, Pilot Assist will slow down for the stationary vehicle.
WARNING
When Pilot Assist 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 stationary vehicle, PilotAssist will ignore the stationary vehicle andinstead select the stored speed.
• The driver must then intervene him/ herself and brake.
Automatic standby mode with change of target
Pilot Assist is disengaged and set in standby mode: •when the speed is below 5 km/h (3 mph) and Pilot Assist is uncertain whether the tar-get object is a stationary vehicle or someother object, e.g. a speed bump.
• when the speed is below 5 km/h (3 mph)and the vehicle in front turns off so the PilotAssist no longer has a vehicle to follow.
Automatic brakingFor shorter stops in connection with inching for-ward in slow traffic or at traffic lights, driving isautomatically resumed if the stops do not exceedabout 3 seconds - if it takes longer before thecar in front starts moving again then the PilotAssist is set in standby mode with automaticbraking.
–Pilot Assist is reactivated in the following way:
• Press the steering wheel button
.
• Depress the accelerator pedal.
> Pilot Assist resumes following the vehicle ahead if it starts moving forward within 6 seconds.
NOTE
Pilot Assist can hold the car stationary for a maximum of 5 minutes - then the parkingbrake is applied and the function is disen-gaged. Before Pilot Assist can be reactivated, the parking brake must be released.