2017 VOLVO XC90 TWIN ENGINE HYBRID Owners Manual

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.263
Electronic Stability Control (ESC)
Electronic Stability Control (ESC) helps reducewheel spin, counteract skidding and to generallyhelp improve directional stability.
A pulsating sound will be audi-ble when the system is activelyoperating and is normal. Accel-eration may also be slightlyslower than normal.

WARNING
ESC is a supplementary aid and cannot dealwith all situations or road conditions.
The driver is always responsible for operatingthe vehicle in a safe manner in accordancewith current traffic regulations.
ESC consists of the following functions:
•Traction control
•Spin control
•Active Yaw Control
•Engine Drag Control
•Trailer Stability Assist

Traction control
This function is designed to help reduce wheelspin by transferring power from a drive wheel that
begins to lose traction to the wheel on the oppo-site side of the vehicle (on the same axle).
Spin control
This function is designed to help prevent thedrive wheels from spinning while the vehicle isaccelerating.

Active Yaw Control
At low speeds, this function helps maintain direc-tional stability by braking one or more of thewheels if the vehicle shows a tendency to skid orslide laterally.

Engine Drag Control EDC
EDC helps keep the engine running if the wheelsshow a tendency to lock, e.g., when shifting downin the manual shifting mode or while using theengine's braking function on a slippery surface. Ifthe wheels were to lock, the vehicle wouldbecome more difficult to steer.

Trailer Stability Assist * 1
TSA helps stabilize a vehicle that is towing atrailer when the vehicle and trailer have begun tosway.
This system is automatically deactivated if thedriver selects Sport mode.
Related information
•Detachable trailer hitch (p. 398)
•Driving with a trailer (p. 397)
•Trailer Stability Assist (TSA) (p. 399)
•Electronic Stability Control (ESC) sport mode(p. 264)
•Electronic Stability Control (ESC) symbolsand messages (p. 265)

1
This function is included if the vehicle is equipped with a Volvo original trailer hitch.

DRIVER SUPPORT
264
Electronic Stability Control (ESC)sport mode
ESC is always activated and cannot be switchedoff.
However, the driver can select Sport mode,which offers more active driving characteristics.
In Sport mode, the engine management systemmonitors movement of the accelerator pedal andsteering wheel for sportier driving and allowsmore lateral movement of the rear wheels beforeESC is triggered.
Under certain circumstances, such as when driv-ing with snow chains, or driving in deep snow orloose sand, it may be advisable to temporarily useSport mode for maximum tractive force.
If the driver releases pressure on the acceleratorpedal, ETC will also activate to help stabilize thevehicle.

Activating/deactivating Sport mode
In the center display's Functionview, tap ESC Sport Mode.The green indicator light in thebutton will illuminate to showthat the function has been acti-vated or gray when the functionis deactivated.
When Sport mode is activated, thissymbol will illuminate in the instrumentpanel. It will remain on until the driverdeactivates the function. ETC will alsoreturn to normal mode when the engine is restar-ted.
Related information
•Electronic Stability Control (ESC) (p. 263)

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265
Electronic Stability Control (ESC)symbols and messages
SymbolMessageDescription
Steady glow for 2 secondswhen the engine is started.The system is performing a self-diagnostic test.
Flashing symbol.ESC is actively functioning to help counteract wheel spin and/or a skid.
Steady glow.Sport mode has been activated.
Please note that ESC is not deactivated at this time but its functionality is reduced.
ESC
Temporarily off
See the message in the instrument panel.

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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

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DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.268

Related information
•Starting and activating the Speed Limiter(SL)* (p. 268)
•Deactivating/reactivating the Speed Limiter*(p. 272)
•Changing a Speed Limiter (SL)* maximumspeed (p. 269)
•Automatic Speed Limiter (ASL)* (p. 269)
•Activating/deactivating the Automatic SpeedLimiter (ASL)* (p. 271)
•Changing tolerance for the Automatic SpeedLimiter (p. 271)
•Turning the Speed Limiter* off (p. 273)
Starting and activating the Speed
Limiter (SL)*
The Speed Limiter (SL) is a feature that has tobe selected and activated in order to set a maxi-mum speed.

Selecting SL (putting it in standby
mode)
Function buttons and symbols
–Press ◀ (1) or ▶ (3) to scroll to the Speed
Limiter () function.
>The symbol (4) will be displayed in theinstrument panel. This indicates that SLhas been selected and is in standbymode (no maximum speed has been set).
Activating SL (putting it in active mode
and setting a maximum speed)
The engine must be running before SL can beput in active mode. The lowest maximum speedthat can be set is 20 mph (30 km/h).
–With SL in standby mode (the will
be displayed), press the button (2).
>This puts SL in active mode and sets thevehicle's current speed as the maximumspeed.

Related information
•Speed limiter (SL)* (p. 267)
•Deactivating/reactivating the Speed Limiter*(p. 272)
•Changing a Speed Limiter (SL)* maximumspeed (p. 269)
•Automatic Speed Limiter (ASL)* (p. 269)
•Activating/deactivating the Automatic SpeedLimiter (ASL)* (p. 271)
•Changing tolerance for the Automatic SpeedLimiter (p. 271)
•Turning the Speed Limiter* off (p. 273)

DRIVER SUPPORT
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* Option/accessory, for more information, see Introduction.269
Changing a Speed Limiter (SL)*maximum speed
Function buttons and symbols
–Change a set maximum speed by pressing
the (1) or — (3) buttons briefly or bypressing and holding them:
•Press briefly: changes the maximumspeed in +/– 5 mph (+/– 5 km/h) incre-ments. Each press changes the maximumspeed by +/– 5 mph (+/– 5 km/h).
•Press and hold: changes the maximumspeed +/– 1 mph (+/– 1 km/h) at a time.Release the button when the indicator (4)has moved to the desired maximumspeed.

Limitations
When driving down steep hills, the SpeedLimiter's braking effect may not be adequate andthe set maximum speed may be exceeded. Themessage Speed limit exceeded will appear inthe instrument panel to alert the driver.

NOTE
This message will appear if the maximumspeed is exceeded by more than approx.2 mph (3 km/h).

Related information
•Speed limiter (SL)* (p. 267)
Automatic Speed Limiter (ASL)*
The Automatic Speed Limiter (ASL) helps thedriver adapt the vehicle's maximum speed to theposted speed limits.
The Speed Limiter (SL) function can be switchedto Automatic Speed Limiter.
Where applicable, ASL uses speed informationfrom the Road Sign Information* system to auto-matically adapt the vehicle's maximum speed.
WARNING
•ASL is a supplemental aid to the driverand does not function in all driving situa-tions or in all traffic, weather or road con-ditions. It can never replace the driver

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DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.270

Is SL or ASL active?
Symbols in the instrument panel indicate whichfunction is active:
SymbolSLASL
A✓✓
Sign symbolB after "70": ASL is acti-vated.
✓
AWHITE symbol: the function is active, GRAY symbol: the func-tion is in standby mode.BSee the section "ASL symbol" below for an explanation of thesymbol's different colors.

ASL symbol
A road sign symbol (next to the storedspeed in the center of the speedome-ter) can be displayed in three differentcolors as explained in the followingtable:
Road signsymbol's colorExplanation
Green/yellowASL is active
GrayASL is in standby mode
Amber/orangeASL is temporarily in standbymode (e.g., because a speedlimit sign could not be read)
Limitations
•ASL utilizes the speed limit information provi-ded by the Road Sign Information* system(RSI), not from the speed limit signs that thevehicle passes.
•If RSI cannot provide ASL with speed-relatedinformation, ASL will go into standby modeand switch to SL. The driver will have to reactand adapt the vehicle's speed.
•ASL will reactivate when RSI is once againable to read a speed limit sign.
See also the article "Road Sign Information limi-tations".

Related information
•Speed limiter (SL)* (p. 267)
•Activating/deactivating the Automatic SpeedLimiter (ASL)* (p. 271)
•Changing tolerance for the Automatic SpeedLimiter (p. 271)
•Starting and activating the Speed Limiter(SL)* (p. 268)
•Deactivating/reactivating the Speed Limiter*(p. 272)
•Road Sign Information (RSI)* (p. 346)
•Road Sign Information (RSI)* limitations(p. 348)