2019 VOLVO XC90 TWIN ENGINE stop start

STARTING AND DRIVING
446Auto-hold brakes
With the Auto-hold brake function, the driver can
release the brake pedal and the brakes will
remain applied, for example, when the vehicle
has stopped at a traffic light or intersection.
When the vehicle stops, the brakes are activated
automatically. The function can use either the
normal brakes or the parking brakes to keep the
vehicle stationary and works on flat surfaces or
hills. When driving off, the brakes will be automat-
ically released if the driver's seat belt is buckled.
NOTE When braking to a stop on an uphill or down-
hill gradient, depress the brake pedal with
slightly more force than usual before releas-
ing to ensure that the vehicle cannot move at
all.
The parking brake is activated if:

the vehicle is switched off
the driver's door is opened
the driver's seat belt is removed
the vehicle has been stationary for a pro-
longed period of time (5-10 minutes)
Symbols in the instrument panel Symbol
Meaning This symbol illuminates when the
function is using the normal brakes
to keep the vehicle stationary.
A
B
This symbol illuminates when the
function is using the parking brake
to keep the vehicle stationary. A
Canadian models.
B US models.
Related information
Activating and deactivating Auto-hold at a
standstill (p. 446)
Brakes (p. 439)
Parking brake (p. 442)
Hill Start Assist (p. 447) Activating and deactivating Auto-
hold at a standstill
The Auto-hold brake function at a standstill is
activated with the button in the tunnel console.
–
Press the button in the tunnel console to
activate or deactivate the function.
>

The indicator light in the button will illumi-
nate when the function is activated. The
function will remain active the next time
the vehicle is started.

STARTING AND DRIVING
}}
447
When shutting off
If the function is active and holding the
vehicle stationary using the normal
brakes (A symbol lit), the brake pedal
must be depressed while pressing the
button in order to deactivate Auto-hold.
The function will remain off until it is reactiva-
ted.
When Auto-hold is switched off, Hill Start
Assist (HSA) will remain active to help pre-
vent the vehicle from rolling backward when
starting up a hill.
Related information
Auto-hold brakes (p. 446) Hill Start Assist
The function for assisting when starting the vehi-
cle on inclines, Hill Start Assist (HSA), helps
prevent the vehicle from rolling backward when
starting on an uphill gradient. When backing up
a hill, HSA helps prevent the vehicle from rolling
forward.
The function retains pressure from the brake
pedal in the brake system for several seconds
after the brake pedal has been released.
This temporary braking effect is released after a
few seconds or when the driver begins driving.
Hill Start Assist is available even if the Auto-hold
brake function is switched off.
Related information
Auto-hold brakes (p. 446)
Brakes (p. 439) Braking assist after a collision
In a collision in which the activation level is
reached for the pyrotechnic seat belt tensioners
or airbags, or if a collision with a large animal is
detected, the vehicle's brakes will be automati-
cally activated. This function is intended to help
prevent or reduce the effects of any subsequent
collision.
After a serious collision, it may no longer be pos-
sible to control and steer the vehicle. In order to
avoid or mitigate a possible further collision with
a vehicle or an object in the vehicle's path, the
brake assist system is activated automatically to
help stop the vehicle safely.
The brake lights and hazard warning flashers are
activated during braking. When the vehicle has
stopped, the hazard warning flashers will con-
tinue to flash and the parking brake will be
applied.
If braking is not appropriate, e.g. if there is a risk
of being hit by passing traffic, the driver can over-
ride the system by depressing the accelerator
pedal.
This function assumes that the brake system is
intact after a collision.
Brake assist is part of the Rear Collision Warning
and Blind Spot Information safety systems.

STARTING AND DRIVING
* Option/accessory.451
Using the steering wheel paddles*
to shift
The steering wheel paddles are a supplement to
the gear selector and make it possible to shift
manually without removing your hands from the
steering wheel.
Activating the steering wheel paddlesIn order to shift gears using the paddles, they
must first be activated:
– Pull one of the paddles toward the steering
wheel.
>

A number in the instrument panel indi-
cates the current gear being used. Instrument panel when the paddles are activated for
shifting.
ChangeTo shift one gear: –
Pull one of the paddles toward the steering
wheel and then release. "-": Shift down one gear.
"+": Shift up one gear.
As long as the engine speed (rpm) is within the
permissible range for the selected gear, a gear
shift will take place each time a paddle is pulled.
After each gear shift, a number indicating the
current gear will be displayed in the instrument
panel.
Turning off Start/Stop
Manual deactivation in gear D and B
– Deactivate the paddles by pulling the right
paddle (+) toward the steering wheel and
holding it until the number of the current
gear is no longer displayed in the instrument
panel.
> The transmission will revert to gear D or B
depending on which gear was selected
before the paddles were activated.
Automatic deactivation
In gear position D, the steering wheel paddles
are deactivated after a short period of time if they
are not used. The number of the current gear will
no longer be displayed in the instrument panel.
In gear position B, the paddles will not activate
automatically.
Related information
Gear selector positions for automatic trans-
missions (p. 449)

STARTING AND DRIVING
453
Drive systems
Volvo Twin Engine combines a combustion
engine for the front wheels and an electric motor
for the rear wheels.
Two drive systemsDepending on the selected drive mode and
power available in the electric motor, the drive
systems can either be used separately or in tan-
dem.
The electric motor gets its energy from a hybrid
battery located under the tunnel console. The
hybrid can be charged from a wall outlet or in a
special charging station. The combustion engine
can also charge the hybrid battery using a special
high-voltage generator.
Both the combustion engine and the electric
motor can generate power directly to the wheels.
An advanced control system coordinates both the
drive systems to help optimize driving economy. Hybrid battery - The hybrid battery's function
is to store electrical current. This energy is
provided by plugging the charging cable into
an electrical outlet, through regenerative
braking or from the high-voltage generator.
This provides current to power the electric
motor and to temporarily power the electrical
air conditioning to precondition the passen-
ger compartment.
Combustion engine - The combustion engine
starts when the charge level in the hybrid
battery is too low to provide the power output
requested by the driver.
High-voltage generator
2
- Charges the hybrid
battery. Starter for the combustion engine. Can provide the combustion engine with
extra electrical current. Electric motor - Powers the vehicle using
electricity. Can provide extra torque and
power during acceleration. Provides electrical
all-wheel drive functionality. Regenerates
braking energy into electrical current.
Related information

General information about Twin Engine
(p. 416)
Starting and stopping the combustion engine
in Twin Engine vehicles (p. 454)
Drive modes (p. 454)
Transmission (p. 448)
Factors affecting electric motor range
(p. 469) 2
CISG (Crank Integrated Starter Generator) - Combined high-voltage gene\
rator and starter.

STARTING AND DRIVING
* Option/accessory.
454 Starting and stopping the
combustion engine in Twin Engine
vehicles
An advanced control system determines the dis-
tance that the vehicle can be driven on the com-
bustion engine, electric motor, or both at the
same time. When driving on only the electric
motor, the vehicle may automatically start the
combustion engine due to outside circumstan-
ces, e.g. low ambient temperatures. This is com-
pletely normal. The combustion engine will also
always start when the hybrid battery is nearly
fully discharged.
Climate settings at low temperaturesAt low ambient temperatures, the combustion
engine will sometimes start automatically to help
achieve the desired passenger compartment
temperature and air quality. The amount of time
the combustion engine is running can be affec-
ted by:
lowering the temperature
reducing blower speed
activating Pure drive mode.
Using the electric motor in hot or cold
weather
At very low or high ambient temperatures, the
electric motor's driving range and power may be
reduced and affect how often the combustion
engine automatically starts.
Emission control systemTo help ensure that the emission control system
functions optimally, the combustion engine will
run for several minutes after it is started. The
amount of time the combustion engine needs to
be used varies depending on the temperature of
the three-way catalytic converter.
WARNING California Proposition 65
Operating, servicing and maintaining a pas-
senger vehicle can expose you to chemicals
including engine exhaust, carbon monoxide,
phthalates, and lead, which are known to the
State of California to cause cancer and birth
defects or other reproductive harm. To mini-
mize exposure, avoid breathing exhaust, do
not idle the engine except as necessary, serv-
ice your vehicle in a well ventilated area and
wear gloves or wash your hands frequently
when servicing your vehicle. For more infor-
mation go to www.P65Warnings.ca.gov/
passenger-vehicle.
Related information

Drive systems (p. 453)
Economical driving (p. 467)
Using the electric motor only (p. 469)
Drive modes (p. 454) Drive modes
Drive modes affect the vehicle's driving charac-
teristics in different ways to enhance and sim-
plify the driving experience in certain types of sit-
uations.
Drive modes enable easy access to the vehicle's
many functions and settings in different driving
situations. The following systems are adapted to
help optimize driving characteristics in each drive
mode:
Steering
Engine/transmission/all-wheel drive
Brakes
Pneumatic suspension* and shock absorbers
Instrument panel
Climate control settings
Select the drive mode that is best suited to the
current driving conditions. Keep in mind that not
all drive modes are available in all situations.

||STARTING AND DRIVING
462
Symbols and messages in driver display
Symbol
Message MeaningSuspension
Deactivated by user
Active chassis has been switched off manually by the user.Suspension
Temporarily reduced performance
Active chassis performance has been temporarily reduced due to extensive\
system use. If this
message appears frequently (e.g. several times in one week) contact a \
workshop
A
. Suspension
Service required
A fault has occurred. Visit a workshop
A
as soon as possible. Suspension failure
Stop safely
A critical fault has occurred. Stop safely, and have the car transported\
(raised with all wheels on
the flatbed) to a workshop
A
.

STARTING AND DRIVING
* Option/accessory.
464 Leveling control settings*
Turn off leveling control before lifting the vehicle
with a jack to help avoid problems with the
pneumatic suspension.
The vehicle can be lowered or raised to make it
easier to load or for passengers to get in and
out.
Adjusting loading mode Use the buttons in the cargo compartment to
raise or lower the rear section of the vehicle to
facilitate loading or unloading the vehicle or con-
necting or disconnecting a trailer.
Center display settings
Easy Entry and Exit Suspension Control
The vehicle can be lowered to make it easier to
get in and out.
Activating easy entry in the center display: 1.
Tap Settings in the Top view.
2.

Tap My Car Mirrors and Convenience
.
3. Select Easy Entry and Exit Suspension
Control.
>

When the vehicle is parked and the
engine is turned off, the level is lowered.
(Level adjustment will stop if a side door
is opened and will resume after a slight
delay when the door has been closed.)
When the engine is started and the vehi-
cle begins to move, the level will be raised
to the height set by the selected drive
mode.
Disable Leveling Control
In certain situations, this function must be turned
off, e.g. before the vehicle is raised using a jack*.
The level difference caused by raising the vehicle
with a jack could cause problems with the pneu-
matic suspension.
Turning off the function in the center display:
1. Tap Settings in the Top view.
2.

Tap My Car Parking Brake and
Suspension .
3. Select Disable Leveling Control.
Related information
Leveling control* and suspension (p. 461)
Loading recommendations (p. 598) Low Speed Control
The low-speed function, Low Speed Control
(LSC), facilitates and improves control and trac-
tion on rough roads and slippery surfaces, e.g.
when towing a trailer on grass or up boat ramps.
The function is included in the Off Road drive
mode.
Low Speed Control is designed for driving on
rough roads and when towing trailers at low
speeds, up to approximately 40 km/h (25 mph).
When driving at low speeds, LSC prioritizes low
gears and all-wheel drive to help avoid wheel spin
and improve traction on all wheels. The accelera-
tor pedal will be less responsive to improve trac-
tion and speed control at low speeds.
The function is activated together with Hill
Descent Control (HDC), which makes it possible
to control speed going down steep hills using the
accelerator pedal and reduces the need to use
the brake pedal. The system makes it possible to
maintain a low and uniform speed when driving
down steep hills.

STARTING AND DRIVING
466Hill Descent Control
The function for assisting when driving downhill,
Hill Descent Control (HDC), is a low-speed
function with increased engine braking. The
function makes it possible to increase or
decrease the vehicle's speed on steep downhill
gradients by only using the accelerator pedal,
without applying the brakes.
The function is included in the Off Road drive
mode.
HDC is designed for driving on rough roads at
low speeds and downhill gradients with slippery
or otherwise difficult road surfaces. The driver
does not need to use the brake pedal but can
instead focus on steering.
WARNING
HDC is only intended to be a supplementary
braking aid and it does not function in all sit-
uations.
The driver is always ultimately responsible for
operating the vehicle in a safe manner.
FunctionHill Descent Control allows the vehicle to move
forward or backward at very low speeds assisted
by the brake system. The driver can increase the
speed by pressing the accelerator pedal. When
the accelerator pedal is released, the vehicle will
return to very low speed regardless of how steep the hill is and without the brakes needing to be
applied. The brake lights will illuminate when the
function is activated.
The driver can brake to stop or slow the vehicle
at any time by depressing the brake pedal.
HDC is activated along with Low Speed Control
(LSC), which facilitates and improves traction and
control on rough and slippery surfaces. The sys-
tem is intended to be used at low speeds, up to
approximately 40 km/h (25 mph).
To keep in mind when using HDC

If the function is switched off while driving on
a steep downhill gradient, braking effect will
be gradually reduced.
HDC can be used in gear positions D and R,
and in manual gears 1 or 2.
It is not possible to manually shift to third
gear or higher when HDC is active.
NOTE When LSC with HDC is activated in the OFF
ROAD drive mode, the feel of the accelerator
pedal and engine response will change.
NOTE
This drive mode is not designed to be used
for normal street driving.
NOTE The function is deactivated when driving at
high speeds and must be reactivated at lower
speeds if so desired.
Related information

Activating and deactivating Hill Descent Con-
trol using the function button (p. 467)
Changing drive mode (p. 459)
Low Speed Control (p. 464)
All Wheel Drive (AWD) (p. 452)