2019 VOLVO XC90 TWIN ENGINE engine

MAINTENANCE AND SERVICE
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627
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 the
vehicle. The hybrid battery is used to start the
combustion 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's
various 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 the
engine is running.
Make sure the cables to the start battery are
correctly connected and the clamps are
securely tightened.
WARNING
Batteries generate hydrogen gas, which
is flammable and explosive.
Do not connect the jumper cable to any
part of the fuel system or to any moving
parts. Avoid touching hot manifolds.
Battery fluid contains sulfuric acid. Do not
allow battery fluid to contact eyes, skin,
fabrics or painted surfaces.
If contact occurs, flush the affected area
immediately with water. Obtain medical
help immediately if eyes are affected.
Never expose the battery to open flame
or electric spark. Do not smoke near the
battery. Failure to follow the instructions
for 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 cause
cancer and reproductive harm. Wash hands
after handling.Use the vehicle's connection points in the engine
compartment to connect an external start battery
or battery charger.
The battery terminals on the car's start 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 the
charging points. Using the charging points to
charge another vehicle's battery could cause
a fuse to blow, which would cause the charg-
ing points to stop working.
15
An authorized Volvo workshop is recommended.

MAINTENANCE AND SERVICE
631
Hybrid battery
The vehicle's electric motor is powered by a
rechargeable, maintenance-free, lithium-ion
hybrid 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 the
hybrid battery.
WARNING
Hybrid battery replacement may only be per-
formed by a workshop – an authorized Volvo
workshop 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 authorized
Volvo workshop is recommended.
Specifications for hybrid batteryType: Lithium-ion
Power reserve: 10.4 kWh.
NOTE
The capacity of the hybrid battery decreases
with age and use, which could result in
increased use of the combustion engine,
leading to higher fuel consumption and
reduced electric motor range.
Related information

Battery symbols (p. 632)
Start battery (p. 627)
Charging the hybrid battery (p. 417)

MAINTENANCE AND SERVICE
633
Location of fuseboxesThe 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. 633)
Fuses in the cargo compartment (p. 641)
Fuses in the engine compartment (p. 634)
Fuses under the glove compartment
(p. 638) Replacing fuses
All electrical functions and components are pro-
tected by a number of fuses in order to protect
the vehicle's electrical system from damage by
short 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 to
replace a fuse. This could cause significant
damage to the electrical system and possibly
lead to a fire.
WARNING
Contact an authorized Volvo workshop for
assistance replacing fuses not listed in the
Owner's Manual. If performed incorrectly, sig-
nificant damage can be caused to the electri-
cal system.
Related information

Fuses and fuseboxes (p. 632)
Fuses in the cargo compartment (p. 641)
Fuses in the engine compartment (p. 634)
Fuses under the glove compartment
(p. 638)

MAINTENANCE AND SERVICE
634Fuses in the engine compartment
The fuses in the engine compartment help pro-
tect electrical components such as engine and
brake functions.

||MAINTENANCE AND SERVICE
* Option/accessory.
636 Function
Ampere12 V outlet in trunk/cargo
compartment*
USB ports for iPad holders
B15 –
––
––
––
–Heated windshield*, left side
ShuntHeated windshield*, left side
40Headlight washers*
25Windshield washer
25–
–Horn
20Alarm siren*
5Brake system control module
(valves, parking brake)
40Wipers
30Rear window washer
25 Function
Ampere 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; trans-
mission components, electrical
power steering, central electri-
cal module
5 Exterior vehicle sound (certain
markets)
5 Right-side headlight
7.5
Right-side headlight, some
models with LED C 15 –
– –
– –
– Airbags
5 Function
Ampere Left-side headlight
7.5
Left-side headlight, some
models with LED C 15 Accelerator pedal sensor 5
Transmission control module;
gear selector control module
15 Engine control module
5 –
– –
– –
– –
– Engine control module; actua-
tor; throttle unit; turbo-charger
valve
20 Solenoids; valve; engine cool-
ing system thermostat
10 Vacuum regulators; valve 7.5
Spoiler shutter control module;
radiator shutter control mod-
ule
5 –
–

MAINTENANCE AND SERVICE
637Function
AmpereHeated oxygen sensor, front;
heated oxygen sensor, rear
15Oil pump solenoid; A/C mag-
netic coupling; heated oxygen
sensor (center)
15–
–Engine control module
20Ignition coils; spark plugs 15
–
––
–Transmission oil pump control
module
30Vacuum pump control module 40
Transmission actuator
25–
––
––
–A
Not Excellence
B Excellence
C LED (Light Emitting Diode)
Related information
Fuses and fuseboxes (p. 632)
Replacing fuses (p. 633)

MAINTENANCE AND SERVICE
}}
* Option/accessory. 639
Fuse pliers are provided on the inside of the fuse
box cover to assist in removing and inserting
fuses.
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 17
. Function
Ampere–
––
––
–Movement sensor*
5Media player
5Instrument panel
5Center console buttons
5Sun sensor
5 Function
Ampere Sensus control module
20 –
– Steering wheel module
5 Module for start knob and
parking brake controls
5 Heated steering wheel* mod-
ule 15 –
– –
– –
– –
– Climate system control mod-
ule
10 –
– Data link connector OBD-II 10
Center display
5 Climate system blower module
(front)
40 Function
Ampere USB HUB
5 Instrument lighting; Interior
lighting; Rearview mirror auto-
dim function*; Rain and light
sensors*; Rear tunnel console
keypad, second row of seats* A
;
Power front seats *; Rear door
control panels; Climate system
blower module left/right
Power rear seats B
; Display for
rear seat convenience func-
tions B
; Rear seat massage
function B 7.5 Control module for driver sup-
port functions
5 Panoramic roof with sun cur-
tain*
20 Head-up display*
5 Passenger compartment light-
ing
5 –
–17
An authorized Volvo workshop is recommended.

||MAINTENANCE AND SERVICE
* Option/accessory.
640 Function
AmpereCeiling console display (seat
belt reminder/front passenger
side airbag indicator)
5–
–Humidity sensor
5Door module in right-side rear
door
Power right rear seat
C20 Fuses in the trunk/cargo com-
partment
10Control module for Internet-
connected vehicle; Control
module for Volvo On Call
5Door module in left-side rear
door
Power left rear seat
D20 Audio control module (ampli-
fier) (certain models only)
40Climate system blower module
(rear)*
40Multi-band antenna module 5
Front seat massage function*
5 Function
Ampere –
– Rear window wiper
15 Fuel pump control module 15
Relay windings for distribution
box in engine compartment;
Relay windings for transmis-
sion oil pump
5 –
– Driver's seat heating
15 Front passenger's seat heat-
ing
15 Coolant pump
10 –
– Power driver's seat*
20 Active chassis control module*
20 –
– Sensus control module
10 –
– –
– Function
Ampere Power front passenger seat*
20 Display for rear seat conven-
ience functions
C
; On-board
diagnostics (OBD II) in tunnel
console between rear seats C
;
Extra movement sensor C5
C TV* (certain markets only)
5 Primary fuse for fuses 9, 53
and 58
15 A
Not Excellence
B Excellence
C Excellence
D Excellence
Related information
Fuses and fuseboxes (p. 632)
Replacing fuses (p. 633)