Volvo V90 (2021 year). Manual in english - page 35

MAINTENANCE AND SERVICE

596

Support battery

Vehicles with the Start/Stop function are
equipped with two batteries – a more power-
ful 12 V start battery and a support battery
that provides stronger current during the
function's start sequence.

The 12 V support battery is located in a box next to

the spring strut in the engine compartment.

If the vehicle is instead equipped with a 48 V support

battery, it is located under the cargo compartment.

The box over the 48 V support battery may only be

removed by an authorized workshop.

WARNING

High voltage may be dangerous if handled

incorrectly. Do not touch anything on bat-

teries that is not clearly described in this

•

Never use a 48 V support battery to
jump start the vehicle.

•

External electrical equipment may not
under any circumstance be connected
to the 48 V battery.

•

Only a workshop may replace or per-
form service on the 48 V battery – an
authorized Volvo workshop is recom-
mended.

NOTE

•

The higher the current consumption in
the vehicle, the more the alternator has
to work and the batteries have to be
charged = increased fuel consumption.

•

When the starter battery capacity has
dropped below the lowest permissible
level, the Start/Stop function is disen-
gaged.

When the Start/Stop function is temporarily
reduced due to high current consumption:

•

The engine will auto-start, even if the
driver does not lift their foot from the
brake pedal.

The support battery does not normally require
more service than the start battery. If you have
any questions or concerns, consult a work-
shop 

‒ 

an authorized Volvo workshop is rec-

ommended.

MAINTENANCE AND SERVICE

597

CAUTION

If the following is not observed, the Start/
Stop function may temporarily stop work-
ing after connection of an external starter
battery or battery charger:

•

The negative battery terminal of the
vehicle's starter battery must 

never

 be

used to connect an external starter
battery or battery charger – only the

vehicle's negative charging point

should be used as a grounding point.

NOTE

If the starter battery has been discharged
to the extent that the vehicle does not have
normal electrical functions and the engine
must then be jump-started with an external
battery or a battery charger, the Start/Stop
function may remain activated. If the Start/
Stop function shortly thereafter auto-stops
the engine, there is a huge risk that auto-
start of the engine will fail due to insuffi-
cient battery capacity since the battery had
not had time to recharge.

If the vehicle has been jump-started or if
there has not been enough time for the
battery to be charged with a battery
charger, the Start/Stop function should be
temporarily deactivated until the battery
has been recharged by the vehicle. At an
ambient temperature of about +15°C
(about 60°F), the battery must be charged
by the vehicle for at least one hour. At
lower ambient temperatures, the charging
time can increase to 3-4 hours. It is advisa-
ble to charge the battery with an external
battery charger.

Specifications for support battery

Type

AGM

Voltage (V)

12

Cold start capacity

A

 -

CCA

B

 (A)

170

Dimensions, L×W×H

150×90×130 mm

(5.9×3.5×5.1

inches)

Capacity (Ah)

10

A

According to EN standard.

B

Cold Cranking Amperes.

CAUTION

If replacing the battery, make sure you
replace it with a battery of the same size,
cold start capacity and type as the original
battery (see the decal on the battery).

Related information

•

Starter battery (p. 594)

•

Start/Stop function (p. 422)

•

Battery symbols (p. 598)

•

Battery recycling (p. 598)

MAINTENANCE AND SERVICE

598

Battery symbols

There are warning symbols and information
on the batteries.

Wear protective goggles.

for additional information.

Keep batteries away from

children.

Batteries contain corro-

sive acid.

Avoid smoking, open

flames, and/or sparks.

Risk of explosion.

Recycle properly.

Related information

•

Starter battery (p. 594)

•

Support battery (p. 596)

•

Battery recycling (p. 598)

Battery recycling

Start batteries and support batteries must be
recycled in an environmentally sound manner
at the end of their service life.

Consult a workshop if you are uncertain of
how to dispose of this type of waste 

‒ 

an

authorized Volvo workshop is recommended.

Related information

•

Starter battery (p. 594)

•

Support battery (p. 596)

•

Battery symbols (p. 598)

MAINTENANCE AND SERVICE

}}

599

Fuses and fuseboxes

All electrical functions and components are
protected by a number of fuses in order to
protect the vehicle's electrical system from
damage by short circuiting or overloading.

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 possi-

bly lead to a fire.

If any electrical component or function is not
responding, the component may have blown a
fuse due to temporary overload. If the same
fuse blows repeatedly, there may be a prob-
lem with the component. Volvo recommends
contacting an authorized Volvo workshop to
have the component checked.

Location of fuseboxes

The illustration is generic - appearance may vary

according to vehicle model.

Engine compartment

Under the glove compartment

Trunk/cargo compartment

Related information

•

Replacing fuses (p. 599)

•

Fuses in the cargo compartment
(p. 612)

•

Fuses in the engine compartment
(p. 601)

•

Fuses under the glove compartment
(p. 606)

Replacing fuses

All electrical functions and components are
protected 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 amper-
age.

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 possi-

bly lead to a fire.

WARNING

Contact an authorized Volvo workshop for

assistance replacing fuses not listed in the

performed incorrectly, significant damage

can be caused to the electrical system.

||

MAINTENANCE AND SERVICE

600

Related information

•

Fuses and fuseboxes (p. 599)

•

Fuses in the cargo compartment (p. 612)

•

Fuses in the engine compartment
(p. 601)

•

Fuses under the glove compartment
(p. 606)

MAINTENANCE AND SERVICE

}}

601

Fuses in the engine compartment

The fuses in the engine compartment help
protect electrical components such as engine
and brake functions.

||

MAINTENANCE AND SERVICE

602

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 fusebox.

Positions

There is a decal with a diagram of the loca-
tions of the fuses on the inside of the cover.

Function

Ampere

Type

–

–

Micro

–

–

Micro

Lambda sensors; Electric charge pressure module

15

Micro

Ignition coils (gasoline); spark plugs (gasoline)

Exhaust sensor; Diesel particulate sensor

15

Micro

Oil pump solenoid; A/C magnetic coupling; heated oxygen sensor, center (gasoline); heated oxygen sensor, rear (diesel);
heated oxygen sensor, front (gasoline/diesel)

15

Micro

Vacuum regulator; Valve; Output pulse valve (diesel); Oil level/temperature sensor (gasoline/diesel); Glow plug (GCU)
(diesel)

7.5

Micro

Engine control module; actuator; throttle unit; EGR valve (diesel); turbo position sensor (diesel); turbocharger valve
(gasoline)

20

Micro

Engine control module

5

Micro

–

–

Micro

Solenoids (gasoline); Fuel leakage control valve; Engine cooling system thermostat (gasoline); EGR vacuum valve (die-
sel); Glow control module (diesel); Supercharger clutch (gasoline); Crankshaft ventilation heater (diesel); Transmission
oil cooler valve (diesel)

10

Micro

Spoiler damper control module; Cooler damper control module; Relay coils for output pulse (diesel); Coolant valve

Fuel leakage detection (gasoline)

5

Micro

MAINTENANCE AND SERVICE

}}

* Option/accessory.

603

Function

Ampere

Type

Coolant pump

15

Micro

Engine control module

20

Micro

Starter motor

40

MCase

A

Starter motor

Shunt

MCase

A

Fuel filter heater (diesel)

30

MCase

A

–

–

MCase

A

Calculation module

5

Micro

–

–

Micro

–

–

Micro

ECM camera

15

Micro

–

–

Micro

Front USB port in tunnel console, rear

*

7.5

Micro

12 V outlet in tunnel console, front

15

Micro

–

–

Micro

12 V outlet in trunk/cargo compartment

*

15

Micro

–

–

Micro

Driver-side headlight, LED

B

15

Micro

||

MAINTENANCE AND SERVICE

* Option/accessory.

604

Function

Ampere

Type

Passenger-side headlight, LED

B

15

Micro

–

–

Micro

–

–

MCase

A

–

–

MCase

A

Headlight washers

*

25

MCase

A

Washer fluid pump

25

MCase

A

Transmission control module; Electric gear selector

15

Micro

Horn

20

Micro

Alarm siren

*

5

Micro

Brake system control module (valves, parking brake)

40

MCase

A

Brake control with 48 V battery

30

MCase

A

Wipers

30

MCase

A

Rear window washer

25

MCase

A

–

–

MCase

A

Parking heater

*

20

MCase

A

Brake system control module (ABS pump)

40

MCase

A

–

–

MCase

A

MAINTENANCE AND SERVICE

605

Function

Ampere

Type

–

–

MCase

A

Fed when ignition is on: engine control module, transmission components, electrical power steering, central electrical
module, brake system control module

5

Micro

–

–

Micro

Passenger-side headlight, LED

B

15

Micro

–

–

Micro

Transmission control module

10

Micro

Battery connection control module

5

Micro

Airbags; Passenger weight sensor

5

Micro

Driver-side headlight, LED

B

15

Micro

Accelerator pedal sensor

5

Micro

A

This type of fuse should be replaced by a workshop. An authorized Volvo workshop is recommended.

B

LED (Light Emitting Diode)

Related information

•

Fuses and fuseboxes (p. 599)

•

Replacing fuses (p. 599)

MAINTENANCE AND SERVICE

606

Fuses under the glove

compartment

Fuses under the glove compartment provide
protection for e.g. electrical outlets, displays
and door modules.

MAINTENANCE AND SERVICE

}}

607

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

There is a decal with a diagram of the loca-
tions of the fuses on the inside of the cover.

||

MAINTENANCE AND SERVICE

* Option/accessory.

608

Function

Ampere

Type

Medium voltage module

A

10

Micro

–

–

MCase

B

–

–

Micro

Movement sensor

*

5

Micro

–

–

Micro

Instrument panel

5

Micro

Center console buttons

5

Micro

Sun sensor

5

Micro

–

–

Micro

–

–

Micro

Steering wheel module

5

Micro

Module for start knob and parking brake controls

5

Micro

Heated steering wheel

*

 module

15

Micro

–

–

Micro

–

–

Micro

–

–

Micro

Rear lamp housing control modules

15

Micro

MAINTENANCE AND SERVICE

}}

* Option/accessory.

609

Function

Ampere

Type

Climate system control module

10

Micro

–

–

Micro

Data link connector OBD-II

10

Micro

Center display

5

Micro

Climate system blower module (front)

40

MCase

B

USB HUB

5

Micro

Instrument lighting; Interior lighting; Rearview mirror auto-dim function

*

; Rain and light sensors

*

; Rear tunnel console

keypad, rear seat

*

; Power front seats

*

; Rear door control panels; Climate system blower module left/right

7.5

Micro

Control module for driver support functions

5

Micro

Panoramic roof with sun curtain

*

20

Micro

Head-up display

*

5

Micro

Passenger compartment lighting

5

Micro

Wireless charging pad

5

Micro

Ceiling console display (seat belt reminder/front passenger side airbag indicator)

5

Micro

–

–

Micro

–

–

Micro

–

–

Micro

||

MAINTENANCE AND SERVICE

* Option/accessory.

610

Function

Ampere

Type

Fuses in the trunk/cargo compartment

10

Micro

Control module for Internet-connected vehicle; Control module for Volvo On Call

5

Micro

Door module in left-side rear door

20

Micro

Infotainment control module (amplifier)

40

MCase

B

–

–

MCase

B

Multi-band antenna module

5

Micro

Front seat massage function

*

5

Micro

–

–

Micro

Rear window wiper

15

Micro

Fuel pump control module

15

Micro

Relay coil for transmission oil pump

Converter medium voltage; Integrated starter motor

5

Micro

Opening trunk/tailgate with foot movement

*

5

Micro

Driver's seat heating

15

Micro

Front passenger's seat heating

15

Micro

Coolant pump

7.5

Micro

–

–

Micro

MAINTENANCE AND SERVICE

* Option/accessory.

611

Function

Ampere

Type

Door module in left-side front door

20

Micro

Active chassis control module

*

20

Micro

–

–

Micro

Sensus control module

10

Micro

–

–

MCase

B

–

–

Micro

Door module in right-side front door

20

Micro

–

–

Micro

TV

*

 (certain markets only)

5

Micro

Primary fuse for fuses 52, 53, 57 and 58

15

Micro

A

Vehicles with 48 V support battery only.

B

This type of fuse should be replaced by a workshop. An authorized Volvo workshop is recommended.

Related information

•

Fuses and fuseboxes (p. 599)

•

Replacing fuses (p. 599)