2017 VOLVO XC90 TWIN ENGINE HYBRID brakes

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.262
Driver support systems
The vehicle is equipped with a number of driversupport systems that help provide the driver withactive/passive support.
Some of these systems are standard while othersare optional and they are designed to e.g., helpthe driver maintain a set speed or a set distanceto a vehicle ahead, or warn the driver of a poten-tial collision situation and in certain cases applythe brakes if necessary. Certain optional systemscan also assist in various parking situations.

Related information
•Adjustable steering force (p. 262)
•Electronic Stability Control (ESC) (p. 263)
•Roll stability control (RSC) (p. 267)
•Speed limiter (SL)* (p. 267)
•Distance Alert* (p. 279)
•Cruise Control (CC) (p. 274)
•Adaptive Cruise Control (ACC)* (p. 281)
•Pilot Assist* (p. 295)
•Driver support system radar sensor (p. 318)
•Driver support system camera (p. 322)
•City Safety™ (p. 326)
•Blind Spot Information (BLIS)* (p. 339)
•Cross Traffic Alert (CTA)* (p. 341)
•Road Sign Information (RSI)* (p. 346)
•Driver Alert Control (DAC) (p. 348)
•Driving lane assistance (p. 350)
•Run-off Mitigation (p. 355)
•Park Assist* (p. 358)
•Park Assist Camera (PAC)* (p. 362)
•Park Assist Pilot (PAP)* (p. 368)
Adjustable steering force
Steering force increases with the speed of thevehicle to give the driver an enhanced sense ofcontrol and stability. At low speed the vehicle iseasier to steer in order to facilitate parking, etc.
Changing the steering force level
To change the level of steering force, see theinformation under the heading "individual" in arti-cle "Drive modes" for additional information.

NOTE
•This steering force level menu functioncannot be accessed when the vehicle isin motion.
•In certain situations, the power steeringfunction may become too hot and mustbe temporarily cooled. During cooling,power steering effect will be reduced andmore force may be necessary to turn thesteering wheel and a message will bedisplayed in the instrument panel.

Related information
•Driver support systems (p. 262)
•Drive modes (p. 420)

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DRIVER SUPPORT
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SymbolMessageDescription
ESC Temporarily offThe ESC system function has been temporarily reduced due to high brake disc temperature. The function reac-tivates automatically when the brakes have cooled.
ESC Service requiredThe ESC system is not functioning properly.
•Stop the vehicle in a safe place, turn off the engine and restart it.
•If the message is still displayed when the engine has restarted, drive to an authorized Volvo workshop tohave the system inspected.

WARNING
The stability system is intended to helpimprove driving safety. It supplements, but cannever replace, the driver's judgment andresponsibility when operating the vehicle.Speed and driving style should always beadapted to traffic and road conditions.

Related information
•Electronic Stability Control (ESC) (p. 263)

DRIVER SUPPORT
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* Option/accessory, for more information, see Introduction.267
Roll stability control (RSC)
Volvo's Roll Stability Control (RSC) is a stabilitysystem designed to help minimize the risk of arollover in emergency maneuvers or if a skidshould occur.
RSC uses a gyroscopic sensor that registers theamount of change in the lateral angle at whichthe vehicle is leaning. Using this information, RSCcalculates the likelihood of a rollover. If there isan imminent risk of a rollover, the stability systemis activated, power to the engine is cut and thebrakes are applied to one or more of the wheelsuntil the vehicle regains stability.

WARNING
The vehicle

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.275

NOTE
Before CC can be activated, the vehicle'sspeed must be at least 20 mph (30 km/h).This is also the lowest speed that can be set.

Activating CC (putting it in active mode
and setting a speed)
–With the symbol displayed (CC is in
standby mode), press the button (2) onthe left-side steering wheel keypad.
>This puts CC in active mode and willmaintain the vehicle's current speed.

Related information
•Cruise Control (CC) (p. 274)
•Switching between Cruise Control andAdaptive Cruise Control* (p. 278)
•Deactivating/resuming Cruise Control (CC)(p. 276)
•Turning Cruise Control off (p. 277)
Changing Cruise Control speed
Changing a set speed
Function buttons and symbols (generic illustration)
–Change a set speed by pressing the (1)or — (3) buttons briefly or by pressing andholding them:
•Press briefly: changes speed in+/– 5 mph (+/– 5 km/h) increments.Each press changes the vehicle's speedby +/– 5 mph (+/– 5 km/h).
•Press and hold: changes the speed+/– 1 mph (+/– 1 km/h) at a time.Release the button when the set speedindicator (4)/(6) has moved to the desiredspeed.
If speed is increased by pressing the accelerator
pedal before the button is pressed, the vehi-cle's speed when the button is pressed will
become the set speed assuming that the accel-erator pedal is still depressed when the button ispressed.
A temporary increase in speed, such as whenpassing another vehicle, does not affect the CCset speed. The vehicle will return to the set speedwhen the accelerator pedal is released. Alwaysobserve posted speed limits.

Engine braking instead of applying the
brakes
CC regulates speed by applying the brakeslightly. To avoid a loss of speed when drivingdown hills, use the engine braking functioninstead of letting the CC apply the brakes. In thissituation, the driver can temporarily deactivate theCC braking function.
To do so:
–Press the accelerator pedal approx. halfwaydown and release it.
>CC will automatically deactivate the auto-matic brake function and will then onlyuse the engine braking function.

Related information
•Cruise Control (CC) (p. 274)

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276
Deactivating/resuming CruiseControl (CC)
Cruise Control (CC) can be temporarily deacti-vated and put in standby mode.

Deactivating and putting CC in standby
mode
To temporarily deactivate and put Cruise Controlin standby mode:
Function buttons and symbols (generic illustration)
–Press the button (2).
>The set speed marker (4) and symbols willchange colors from WHITE to GRAY.
This indicates that CC is temporarily instandby mode and will not maintain a setspeed.
Standby mode due to action by the driver
CC is temporarily deactivated and put in standbymode if:
•the brakes are applied
•The gear selector is moved to N
•the vehicle is driven faster than the setspeed for more than 1 minute.
In these cases, the driver will have to regulate thevehicle's speed.
A temporary increase in speed, such as whenpassing another vehicle, does not affect the CCset speed. The vehicle will return to the set speedwhen the accelerator pedal is released.

Automatic standby mode
CC switches automatically to standby mode if:
•the wheels lose traction
•engine speed (rpm) is too high/low
•brake temperature is too high
•the vehicle's speed goes below approx.20 mph (30 km/h)
In these cases, the driver will have to regulate thevehicle's speed.
Reactivating CC from standby mode
To reactivate CC after it has temporarily been putin standby mode:
–Press the button (1).
>The set speed marker (4) will changecolor from GRAY to WHITE. The vehiclewill then return to the most recently setspeed.

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

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.278
Switching between Cruise Control
and Adaptive Cruise Control*
In models equipped with the optional ACC, thedriver can toggle between CC and ACC.
A symbol in the instrument panel will indicatewhich system is currently being used:
CC
Cruise Control
ACC
Adaptive Cruise Control
AA
AIf the symbol is WHITE, the function is active. If the symbol isGRAY, the function is in standby mode.

Switching from ACC to CC
To switch from ACC to CC:
1.Put ACC in standby mode with the but-ton on the left-side steering wheel keypad.
2.From the center display's Function view, tapthe Cruise control button.
>The symbol in the instrument panel will
change from (ACC) to (CC) and CC is in standby mode (readyfor use but not currently maintaining a setspeed).
3.Press the button on the left-side steer-ing wheel keypad.
>CC goes into active mode and sets thevehicle's current speed.
WARNING
Switching from ACC to CC means that:
•Your vehicle will no longer automaticallymaintain a set distance to a vehicleahead.
•Only the set speed will be maintained andthe driver will have to apply the brakeswhen needed.
If CC was activated when the engine was turnedoff, ACC will be selected and go into standbymode when the engine is restarted.

Switching from CC to ACC
To switch from CC to ACC:
1.Put CC in standby mode with the buttonon the left-side steering wheel keypad.
2.In the center display's Function view, tap theAdaptive Cruise Control button.
>The symbol in the instrument panel will
change from (CC) to (ACC) and ACC is in standby mode (readyfor use but not currently maintaining a setspeed/time interval).
3.Press the button on the left-side steer-ing wheel keypad.
>ACC goes into active mode and sets thevehicle's current speed and the selectedtime interval to the vehicle ahead.
Related information
•Cruise Control (CC) (p. 274)
•Adaptive Cruise Control (ACC)* (p. 281)
•Center display overview (p. 33)

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vehicle set by the driver. If the radar sensor doesnot detect a vehicle ahead, ACC will insteadmaintain the speed set by the driver.
ACC is designed to smoothly regulate speed.However, the driver must apply the brakes in sit-uations that require immediate braking such aswhen there are great differences in speedbetween vehicles, or if the vehicle ahead brakessuddenly. Due to limitations in the radar sensor,braking may occur unexpectedly or not at all.
Adaptive Cruise Control can follow another vehi-cle from a standstill up to 125 mph (200 km/h).Always observe posted speed limits.
The driver can also toggle between ACC andCruise Control (CC) – see the article "Switchingbetween Cruise Control and Adaptive CruiseControl".

WARNING
•It is advisable to read through all of therelated articles pertaining to ACC (seethe list at the end of this article).
•Adaptive Cruise Control cannot cover alldriving situations and traffic, weather androad conditions.
•This system is designed to be a supple-mentary driving aid. It is not, however,intended to replace the driver's attentionand judgement. The driver is responsiblefor maintaining a safe distance and speedand must intervene if Adaptive CruiseControl does not maintain a suitablespeed or suitable distance to the vehicleahead.
•Maintenance of ACC components mayonly be performed by a trained and quali-fied Volvo technician.

Overview
The distance to the vehicle ahead (in the samelane) is monitored by a radar sensor. Your vehi-cle's speed is regulated by accelerating andbraking. The brakes may emit a sound when theyare being modulated by the adaptive cruise con-trol system. This is normal.
WARNING
•Adaptive Cruise Control is not a collisionavoidance system. The driver is alwaysresponsible for applying the brakes if thesystem does not detect another vehicle.
•Adaptive Cruise Control does not react topeople or animals, or small vehicles suchas bicycles and motorcycles. It also doesnot react to slow moving, parked orapproaching vehicles, or stationaryobjects.
•Do not use Adaptive Cruise Control indemanding driving conditions such as citydriving or other heavy traffic situations, inslippery conditions, when there is a greatdeal of water or slush on the road, duringheavy rain or snow, in poor visibility, onwinding roads or on highway on- or off-ramps.

DRIVER SUPPORT
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Controls
Function buttons and symbols (generic illustration)
Increases the set speed or puts ACC backinto active mode (previous settings will beresumed)
Puts ACC in active mode and stores the cur-rent speed or puts ACC in standby mode
Reduces the set speed
Increases the time interval/distance to thevehicle ahead
Reduces the time interval/distance to thevehicle ahead
Target vehicle indicator: ACC has detectedand is following a target vehicle using the settime interval
Distance/time indicator
Instrument panel
Speed indicators
Set speed
Speed of the vehicle ahead
The current speed of your vehicle
See the article "Adaptive cruise control symbolsand messages" for examples of different combi-nations of symbols, depending on the traffic sit-uation.

Collision warning
Warning light in the windshield
Adaptive Cruise Control can exert brake forcethat is equivalent to approximately 40% of thevehicle's total braking capacity.
In situations requiring more brake force thanACC can provide and if the driver does not applythe brakes, an audible signal from the City Safetysystem will sound and warning light will illuminatein the windshield to alert the driver 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.