2019 VOLVO S90 TWIN ENGINE wheel

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Parking brake
The parking brake helps keep the vehicle sta-tionary by mechanically locking two wheels.
The parking brake controls are located in the tunnelconsole between the seats.
When the electric parking brake is being applied,a faint sound can be heard from the brake's elec-tric motor. This sound can also be heard duringthe automatic function check of the parkingbrake.
If the vehicle is stationary when the parking brakeis applied, it will only be applied to the rearwheels. If it is applied while the vehicle is moving,the normal brakes will be used on all four wheels.Braking will be transferred to only the rearwheels when the vehicle is almost stopped.

Related information
Activating and deactivating the parking brake(p. 434)
Parking on a hill (p. 436)
Parking brake malfunction (p. 436)
Auto-hold brakes (p. 437)
Activating and deactivating theparking brake
Use the parking brake to help keep the vehiclestationary when it is parked.

Activating the parking brake
1. Pull up the control.
> The symbol in the instrument panel willilluminate when the parking brake is acti-vated.
2.Make sure the vehicle is stationary.

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Settings for automatically activatingthe parking brake
Choose whether the parking brake should beactivated automatically when the vehicle isswitched off.
This selection is made in the Settings menu inthe center display.
1.Tap Settings in the Top view.
2. Tap My CarParking Brake andSuspension and select or deselect theAuto Activate Parking Brake function.

Related information
Activating and deactivating the parking brake(p. 434)
Parking brake (p. 434)
Parking on a hill
Always use the parking brake when parking on ahill.
WARNING
Always apply the parking brake when parkingon an incline. Selecting a gear or putting theautomatic transmission in P may not be suffi-cient to keep the vehicle stationary in all sit-uations.
If the vehicle is pointing uphill:
Turn the front wheels so they are pointingaway from the curb.
If the vehicle is pointing downhill:
Turn the front wheels so they are pointingtoward the curb.

Heavy load uphill
Heavy loads, such as a trailer, could cause thevehicle to roll backward when the parking brakeis released automatically on steep uphill gradi-ents. To help avoid this, pull the control upwardwhile you are driving away. Release the controlwhen the vehicle gains traction.

Related information
Activating and deactivating the parking brake(p. 434)
Parking brake malfunction
If you are unable to deactivate or activate theparking brake after several attempts, contact anauthorized Volvo workshop.
A audible warning signal will sound if the parkingbrake is applied while the vehicle is being driven.
If the vehicle must be parked before the problemis rectified, turn the wheels as when parking onan incline and put the gear selector in P.
Low battery charge level
If the battery charge level is too low, it will not bepossible to apply or release the parking brake.Connect an auxiliary battery to the vehicle if thebattery is discharged.

Replacing brake pads
Due to the design of the electric parking brake,the rear brake pads must be replaced by a work-shop. An authorized Volvo workshop is recom-mended.

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Transmission
The transmission is part of the vehicle's driveline(power transmission) between the engine andthe drive wheels. The function of the transmis-sion is to change gears depending on speedand power needs.
The vehicle has an 8-speed automatic transmis-sion and an electric motor for rear-wheel drive.The number of gears allows the engine's torqueand power band to be effectively utilized. Two ofthe gears are overdrive gears that save fuel whendriving at a constant engine speed. The steeringwheel paddles* can be used to shift up or downmanually. The instrument panel shows the gearcurrently in use.

CAUTION
Check the operating temperature of thetransmission to help avoid damage to any ofthe drive system components. If there is a riskof overheating, a warning symbol will appearin the instrument panel and a text messagewill be displayed. Follow the recommenda-tions given.

Symbols in the instrument panel
If a problem should occur with the transmission, asymbol and a message will appear in the instru-ment panel.
Symbol Meaning
Information and messages relatedto the transmission. Follow the rec-ommendations provided.
Hot or overheated transmission.Follow the recommendations provi-ded.
Reduced performance/Acceler-ation performance reduced
In the event of a temporary fault inthe driveline, the vehicle may gointo a "limp home" mode withreduced power output to help avoiddamage to the driveline.
Related information
Gear selector positions for automatic trans-missions (p. 440)
Gear selector positions forautomatic transmissions
In vehicles with an automatic transmission, thesystem selects the optimal gear for the currentdriving conditions. The transmission also has amanual mode.
The instrument panel shows which gear is cur-rently in use:
P, R, N, D or B.
For manual shifting, the gear indicator in theinstrument panel displays the gear currentlybeing used (1-8).

Selecting gears
The gear selector is a shift-by-wire selector,where shifting is done electronically instead ofmechanically. This makes shifting easier and thegear positions more distinct.

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Select gears by moving the spring-loaded, non-locking gear selector forward or backward.

Gear selector positions
Park - P
Park is activated using the P button located nextto the gear selector.
Select P when the vehicle is parked or when star-ting the engine. The vehicle must be stationarywhen Park is selected.
To move to another gear from Park, the brakepedal must be depressed and the ignition inmode II.
When parking – apply the parking brake beforeshifting to Park.
WARNING
Always apply the parking brake when parkingon an incline. Selecting a gear or putting theautomatic transmission in P may not be suffi-cient to keep the vehicle stationary in all sit-uations.

NOTE
The gear selector must be in the P positionbefore the vehicle can be locked and thealarm set.
Help functions
The system will automatically shift to P:
if the ignition is switched off while D or R isselected.
if the driver unbuckles the seat belt andopens the driver's door while the vehicle isrunning with the gear selector in a gear otherthan P.
To park a vehicle with an unbuckled seat belt andopen door – end P mode by shifting to R or Dagain.
The system will not automatically shift to P if theignition is switched off while the gear selector isin the neutral position (N). This is to make it pos-sible to wash the vehicle in an automatic carwash in which the vehicle is pulled forward onrolling wheels.
Reverse - R
Select R when backing up. The vehicle must bestationary when Reverse is selected.

Neutral - N
No gear is selected and the engine can bestarted. Apply the parking brake if the vehicle isstationary with the gear selector in N.
To move the gear selector from Neutral toanother gear, the brake pedal must be depressedand the ignition in mode II.

D drive mode
D is the normal driving gear position. The trans-mission shifts up or down automatically depend-ing on acceleration and speed. The vehicle mustbe stationary when the gear selector is movedfrom R to D.

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Brake - B
B can be selected at any time during a drive. In Bmode, the engine braking function is activatedwhen the accelerator pedal is released, whichhelps charge the hybrid battery. This offers addi-tional opportunities to recharge the hybrid bat-tery, since the battery is charged even when thebrake pedal is not depressed.
B mode in the instrument panel.
From B mode, it is possible to manually shift tolower gears. The currently selected gear (1-8) willbe displayed in the instrument panel.
Pull the gear selector backward once to shiftdown one gear.
Pull the gear selector backward again to shiftdown to lower gears.
To shift manually to a higher gear, the vehiclemust be equipped with steering wheel paddles*.
Push the gear selector forward to return to Dmode.
For smooth shifting and engine performance, thetransmission will shift down automatically if thevehicle's speed becomes too low for the selectedgear.

Related information
Shiftlock (p. 443)
Using the steering wheel paddles* to shift(p. 442)
The kickdown function (p. 444)
Using the steering wheel paddles*to shift
The steering wheel paddles are a supplement tothe gear selector and make it possible to shiftmanually without removing your hands from thesteering wheel.

Activating the steering wheel paddles
In order to shift gears using the paddles, theymust first be activated:
–Pull one of the paddles toward the steeringwheel.
> A number in the instrument panel indi-cates the current gear being used.
Instrument panel when the paddles are activated forshifting.

Change
To shift one gear:

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–Pull one of the paddles toward the steeringwheel and then release.
"-": Shift down one gear.
"+": Shift up one gear.
As long as the engine speed (rpm) is within thepermissible range for the selected gear, a gearshift will take place each time a paddle is pulled.
After each gear shift, a number indicating thecurrent gear will be displayed in the instrumentpanel.

Turning off Start/Stop
Manual deactivation in gear D and B
–Deactivate the paddles by pulling the rightpaddle (+) toward the steering wheel andholding it until the number of the currentgear is no longer displayed in the instrumentpanel.
>The transmission will revert to gear D or Bdepending on which gear was selectedbefore the paddles were activated.

Automatic deactivation
In gear position D, the steering wheel paddlesare deactivated after a short period of time if theyare not used. The number of the current gear willno longer be displayed in the instrument panel.
In gear position B, the paddles will not activateautomatically.

Related information
Gear selector positions for automatic trans-missions (p. 440)
Shiftlock
The automatic transmission's shiftlock functionhelps prevent inadvertently moving the gearselector between different positions.
Automatic shiftlock
The automatic shiftlock has a separate safetysystem.

From Park - P
To move to another gear from P (Park), the brakepedal must be depressed and the ignition inmode II.

From Neutral - N
If the gear selector is in N and the vehicle hasbeen stationary for at least 3 seconds (with orwithout the engine running), the gear selector willbe locked in that position.
To move the gear selector from N to anothergear, the brake pedal must be depressed and theignition in mode II.

Messages in the instrument panel
If the gear selector is locked in position, a mes-sage will appear in the instrument panel, e.g.Gear lever Press brake pedal to activategear lever.
There is no mechanical shiftlock function.

Related information
Gear selector positions for automatic trans-missions (p. 440)

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The kickdown function
Kickdown is used when maximum acceleration isneeded, e.g. when passing.
When the accelerator pedal is depressed all theway to the floor (past the normal full acceleratorposition), the transmission will automaticallyengage kickdown, i.e. immediately shift down to alower gear.
If the accelerator pedal is released from the kick-down position, the transmission will automaticallyshift up again.

Safety function
The transmission control module is equipped witha downshift protection feature to help prevent theengine from overheating.
In some conditions, the transmission will preventdownshifting/kickdown if this would lead to suchhigh engine speed (rpm) that the engine couldbe damaged. If the driver still attempts downshift-ing or kickdown at a high rpm, nothing will hap-pen and the original gear will remain selected.
With kickdown, the vehicle can downshift one ormore steps at a time depending on the enginespeed. The vehicle upshifts when the engine rea-ches its maximum rpm to prevent engine dam-age.

Related information
Gear selector positions for automatic trans-missions (p. 440)
All Wheel Drive (AWD)
All-wheel drive, All Wheel Drive (AWD), alsocalled four-wheel drive, means that power is dis-tributed to all four wheels, which improves trac-tion.
The electric motor that powers the rear wheelsenables electronic all-wheel drive functionality.All-wheel drive reacts differently depending onwhich drive mode is selected.
Related information
Drive modes (p. 446)
Transmission (p. 440)
Drive systems
Volvo Twin Engine combines a combustionengine for the front wheels and an electric motorfor the rear wheels.
Two drive systems
Depending on the selected drive mode andpower available in the electric motor, the drivesystems can either be used separately or in tan-dem.
The electric motor gets its energy from a hybridbattery located under the tunnel console. Thehybrid can be charged from a wall outlet or in aspecial charging station. The combustion enginecan also charge the hybrid battery using a specialhigh-voltage generator.
Both the combustion engine and the electricmotor can generate power directly to the wheels.An advanced control system coordinates both thedrive systems to help optimize driving economy.

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Hybrid battery - The hybrid battery's functionis to store electrical current. This energy isprovided by plugging the charging cable intoan electrical outlet, through regenerativebraking or from the high-voltage generator.This provides current to power the electricmotor and to temporarily power the electricalair conditioning to precondition the passen-ger compartment.
Combustion engine - The combustion enginestarts when the charge level in the hybridbattery is too low to provide the power outputrequested by the driver.
High-voltage generator2 - Charges the hybridbattery. Starter for the combustion engine.
Can provide the combustion engine withextra electrical current.
Electric motor - Powers the vehicle usingelectricity. Can provide extra torque andpower during acceleration. Provides electricalall-wheel drive functionality. Regeneratesbraking energy into electrical current.

Related information
General information about Twin Engine(p. 408)
Starting and stopping the combustion enginein Twin Engine vehicles (p. 445)
Drive modes (p. 446)
Transmission (p. 440)
Factors affecting electric motor range(p. 455)
Starting and stopping thecombustion engine in Twin Enginevehicles
An advanced control system determines the dis-tance that the vehicle can be driven on the com-bustion engine, electric motor, or both at thesame time. When driving on only the electricmotor, the vehicle may automatically start thecombustion engine due to outside circumstan-ces, e.g. low ambient temperatures. This is com-pletely normal. The combustion engine will alsoalways start when the hybrid battery is nearlyfully discharged.

Climate settings at low temperatures
At low ambient temperatures, the combustionengine will sometimes start automatically to helpachieve the desired passenger compartmenttemperature and air quality. The amount of timethe 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, theelectric motor's driving range and power may be
2CISG (Crank Integrated Starter Generator) - Combined high-voltage generator and starter.