2018 VOLVO XC90 T8 engine

MAINTENANCE AND SERVICE
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615
Start battery
The vehicle has a single-pole electrical system that uses the chassis and engine mount as con-ductors. The start battery is used to start the electrical system and power electrical equipment in thevehicle. The hybrid battery is used to start thecombustion engine. The start battery should only be replaced by a workshop 15
.
The start battery is a 12 V AGM (Absorbed Glass Mat) battery, dimensioned for regenerative charg-ing and to support the function of the vehicle'svarious systems. The service life and performance of the start bat- tery are affected by factors such as driving style,driving conditions, climate, battery discharges,number of starts, etc.
• Never disconnect the start battery while theengine is running.
• Make sure the cables to the start battery arecorrectly connected and the clamps aresecurely tightened.
WARNING
•Batteries generate hydrogen gas, which is flammable and explosive.
• Do not connect the jumper cable to anypart of the fuel system or to any movingparts. Avoid touching hot manifolds.
• Battery fluid contains sulfuric acid. Do notallow battery fluid to contact eyes, skin,fabrics or painted surfaces.
• If contact occurs, flush the affected areaimmediately with water. Obtain medicalhelp immediately if eyes are affected.
• Never expose the battery to open flameor electric spark. Do not smoke near thebattery. Failure to follow the instructionsfor jump starting can lead to injury.
Connection points
WARNING
PROPOSITION 65 WARNING Battery posts, terminals, and related accesso- ries contain lead and lead compounds, chemi-cals known to the state of California to causecancer and reproductive harm. Wash handsafter handling. Use the vehicle's connection points in the engine compartment to connect an external start batteryor battery charger. The battery terminals on the car's starter battery in the luggage/cargo area must
not be used.
Positive connection point
Negative connection point
CAUTION
It is not possible to charge another vehicle's battery by means of current through thecharging points. Using the charging points tocharge another vehicle's battery could causea fuse to blow, which would cause the charg-ing points to stop working.
15
An authorized Volvo workshop is recommended.

MAINTENANCE AND SERVICE
619
Hybrid battery
The vehicle's electric motor is powered by a rechargeable, maintenance-free, lithium-ionhybrid battery.
NOTE
The vehicle cannot be started if the hybrid battery is discharged.
NOTE
If both the starter battery and the hybrid bat- tery are discharged, both batteries must be
charged. In such cases, it is not possible to charge only the hybrid battery first. The starter battery must have a certain level of charge for it to be possible to charge thehybrid battery.
WARNING
Hybrid battery replacement may only be per- formed by a workshop – an authorized Volvoworkshop is recommended.
CoolantThe hybrid battery's cooling system has its own expansion tank.
CAUTION
Filling the hybrid battery coolant should only be performed by a workshop – an authorizedVolvo workshop is recommended.
SpecificationsType: Lithium-ion
Power reserve: 10.4 kWh.
NOTE
The capacity of the hybrid battery decreases with age and use, which could result inincreased use of the combustion engine,leading to higher fuel consumption andreduced electric motor range.
Related information
•Battery symbols (p. 620)
• Start battery (p. 615)
• Charging the hybrid battery (p. 407)

MAINTENANCE AND SERVICE
621
Location of fuseboxes
The illustration is generic - appearance may vary accord- ing to vehicle model.
Engine compartment
Under the glove compartment
Trunk/cargo compartment
Related information
•Replacing fuses (p. 621)
• Fuses in the cargo compartment (p. 629)
• Fuses in the engine compartment (p. 622)
• Fuses under the glove compartment (p. 626)
Replacing fuses All electrical functions and components are pro- tected by a number of fuses in order to protectthe vehicle's electrical system from damage byshort circuiting or overloading.
1. Refer to the fuse diagram to locate the fuse.
2. Pull out the fuse and examine it from the
side to determine if the curved metal wire in the fuse is intact.
3. If the wire is broken, replace the fuse with a new fuse of the same color and amperage.
WARNING
Never use a foreign object or a fuse with a higher amperage than that specified toreplace a fuse. This could cause significantdamage to the electrical system and possiblylead to a fire.
WARNING
Contact an authorized Volvo workshop for assistance replacing fuses not listed in theOwner's Manual. If performed incorrectly, sig-nificant damage can be caused to the electri-cal system.
Related information
• Fuses and fuseboxes (p. 620)
• Fuses in the cargo compartment (p. 629) •
Fuses in the engine compartment (p. 622)
• Fuses under the glove compartment (p. 626)

MAINTENANCE AND SERVICE
622
Fuses in the engine compartment
The fuses in the engine compartment help pro- tect electrical components such as engine andbrake functions.

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MAINTENANCE AND SERVICE
* Option/accessory.
624
FunctionAA
12 V outlet in trunk/cargo com- partment *
USB ports for iPad holders C15
– –
– –
– –
– –
Heated windshield
*, left side Shunt
Heated windshield
*, left side 40
Headlight washers
*25
Windshield washer 25
– –
Horn 20
Alarm siren
* 5
Brake system control module (valves, parking brake) 40
Wipers 30
Rear window washer 25
FunctionAA
Heated windshield
*, right side 40
Parking heater
* 20
Brake system control module (ABS pump) 40
– –
Heated windshield
*, right side Shunt
Fed when ignition is on: Engine control module; transmissioncomponents, electrical powersteering, central electrical mod-ule 5
Exterior vehicle sound (certain markets)
5
Right-side headlight 7.5 Right-side headlight, some mod- els with LED
D 15
– –
– –
– –
Airbags 5
FunctionAA
Left-side headlight 7.5 Left-side headlight, some mod- els with LED
D 15
Accelerator pedal sensor 5
Transmission control module; gear selector control module 15
Engine control module 5
– –
– –
– –
– –
Engine control module; actuator; throttle unit; turbo-charger valve20
Solenoids; valve; engine cooling system thermostat10
Vacuum regulators; valve 7.5
Spoiler shutter control module; radiator shutter control module 5
– –

MAINTENANCE AND SERVICE
625
FunctionAA
Heated oxygen sensor, front; heated oxygen sensor, rear15
Oil pump solenoid; A/C mag- netic coupling; heated oxygensensor (center)15
– –
Engine control module 20
Ignition coils; spark plugs 15
– –
– –
Transmission oil pump control module
30
Vacuum pump control module 40
Transmission actuator 25
– –
– –
– –
A
Ampere
B Not Excellence
C Excellence
D LED (Light Emitting Diode)
Related information
• Fuses and fuseboxes (p. 620)
• Replacing fuses (p. 621)

MAINTENANCE AND SERVICE
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* Option/accessory.627
Fuse pliers are provided on the inside of the fuse box cover to assist in removing and insertingfuses. There are also spaces for several extra fuses in the
distribution box in the engine compart-
ment .
Positions
•Fuses 1, 3-21, 23-36, 39-53 and 55-59 are "Micro" fuses.
• Fuses 2-22, 37-38 and 54 are "MCase"fuses and should only be replaced by a work- shop 18
.
FunctionAA
– –
– –
– –
Movement sensor * 5
Media player 5
Instrument panel 5
Center console buttons 5
Sun sensor 5
FunctionAA
– –
– –
Steering wheel module 5
Module for start knob and parking brake controls 5
Heated steering wheel
* module 15
– –
– –
– –
– –
Climate system control module 10
– –
Data link connector OBD-II 10
Center display 5
Climate system blower module (front) 40
USB HUB 5
FunctionAA
Instrument lighting; Interior lighting; Rearview mirror auto-dim function
*;
Rain and light sensors *; Rear tun-
nel console keypad, second row of seats *B
; Power front seats *; Rear
door control panels; Climate sys- tem blower module left/right Power rear seats C
; Display for rear
seat convenience functions C
; Rear
seat massage function C7.5
Control module for driver support functions
5
Panoramic roof with sun curtain
*20
Head-up display
* 5
Passenger compartment lighting 5
– –
Ceiling console display (seat belt reminder/front passenger side air-bag indicator) 5
– –
Humidity sensor 5
18
An authorized Volvo workshop is recommended.

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MAINTENANCE AND SERVICE
* Option/accessory.
628
FunctionAA
Door module in right-side rear door 20
Fuses in the trunk/cargo compart- ment 10
Control module for Internet-con- nected vehicle; Control module forVolvo On Call 5
Door module in left-side rear door 20
Audio control module (amplifier) (certain models only)
40
Climate system blower module (rear)
* 40
Multi-band antenna module 5
Front seat massage function
*5
– –
Rear window wiper 15
Fuel pump control module 15
Relay windings for distribution box in engine compartment; Relaywindings for transmission oil pump 5
– –
FunctionAA
Driver's seat heating 15
Front passenger's seat heating 15
Coolant pump 10
– –
Door module in left-side front door 20
Active chassis control module
*20
– –
Sensus control module 10
– –
– –
Door module in right-side front door 20
Display for rear seat convenience functions
C
; On-board diagnostics
(OBD II) in tunnel console betweenrear seats C
; Extra movement sen-
sor C 5
C
FunctionAA
TV
* (certain markets only) 5
Primary fuse for fuses 53 and 58 15
A
Ampere
B Not Excellence
C Excellence
Related information
• Fuses and fuseboxes (p. 620)
• Replacing fuses (p. 621)