hybrid VOLVO S90 TWIN ENGINE 2020 Workshop Manual

MAINTENANCE AND SERVICE
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573
Engine compartment overview
This overview shows some service-related components.
Some of the components included in the vehi- cle's electric drive system are located in theengine compartment. Exercise caution whenaccessing the engine compartment and onlytouch what is required for normal mainte-nance.
WARNING
Orange wiring may only be handled by qualified personnel.
WARNING
A number of electrical components in Twin Engine Plug-in Hybrid vehicles use high-voltage current and can be extremely dan-gerous if handled incorrectly.
Do not touch anything that is not clearly described in this Owner's Man-ual.
Be careful when checking/filling fluidsin the engine compartment.
The layout of the engine compartment may vary depending on model and engine variant.
Coolant expansion tank
Brake fluid reservoir (located on the driv- er's side)
Washer fluid filler pipe 12
Fusebox
Air filter
Engine oil filler pipe
WARNING
Bear in mind that the cooling fan (located at the front of the engine compartmentbehind the radiator) may start or continuerunning automatically up to about6 minutes after the engine is turned off. Always entrust engine washing to a work- shop – an authorized Volvo workshop isrecommended. If the engine is hot, there isa risk of fire.
WARNING
The ignition system works with extremely high and dangerous voltages. The vehicleelectrical system should always be in igni-tion mode
0 when work in being per-
formed in the engine compartment. Do not touch any spark plugs or ignition coils when the vehicle electrical system isin ignition mode II or when the engine is
warm.
Related information
Opening and closing the hood (p. 571)
Filling washer fluid (p. 621)
Refilling coolant (p. 576)
Fuses in the engine compartment (p. 587)
12
Fill the washer fluid at regular intervals, e.g. when refueling.

MAINTENANCE AND SERVICE
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579
Start battery
The vehicle has a single-pole electrical sys- tem that uses the chassis and engine mountas conductors. 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 17
.
The start battery is a 12 V AGM (Absorbed Glass Mat) battery, dimensioned for regenera-tive charging and to support the function ofthe vehicle's various systems. The service life and performance of the start battery are affected by factors such as drivingstyle, driving conditions, climate, battery dis-charges, number of starts, etc. Never disconnect the start battery while the engine is running.
Make sure the cables to the start batteryare correctly connected and the clampsare securely tightened.
WARNING
Batteries generate hydrogen gas, which is flammable and explosive.
Do not connect the jumper cable toany part of the fuel system or to anymoving parts. Avoid touching hotmanifolds.
Battery fluid contains sulfuric acid. Donot allow battery fluid to contact eyes,skin, fabrics or painted surfaces.
If contact occurs, flush the affectedarea immediately with water. Obtainmedical help immediately if eyes areaffected.
Never expose the battery to open flameor electric spark. Do not smoke nearthe battery. Failure to follow theinstructions for jump starting can leadto injury.
Connection points
WARNING
California Proposition 65 Operating, servicing and maintaining a pas- senger vehicle can expose you to chemi-cals including engine exhaust, carbon mon-oxide, phthalates, and lead, which areknown to the State of California to causecancer and birth defects or other reproduc-tive harm. To minimize exposure, avoidbreathing exhaust, do not idle the engineexcept as necessary, service your vehicle ina well ventilated area and wear gloves orwash your hands frequently when servicingyour vehicle. For more information go towww.P65Warnings.ca.gov/passenger-vehicle.
Use the vehicle's connection points in the engine compartment to connect an externalstart battery or battery charger. The battery terminals on the car's start battery in the luggage/cargo area must not be used.
17
An authorized Volvo workshop is recommended.

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MAINTENANCE AND SERVICE
580
Positive connection point
Negative connection point
CAUTION
It is not possible to charge another vehi- cle's battery by supplying current throughthe charging points. Using the chargingpoints to charge another vehicle's batterycould cause a fuse to blow, which wouldcause the charging points to stop working.
CAUTION
Only a modern battery charger with con- trolled charge voltage should be used tocharge the starter battery. The rapid charg-ing function should not be used as thiscould damage the battery.
NOTE
If both the starter battery and the hybrid battery are discharged, both batteries
must be charged. In such cases, it is notpossible to charge only the hybrid batteryfirst. The starter battery must have a certain level of charge for it to be possible tocharge the hybrid battery.
CAUTION
Failure to observe the following could cause the infotainment energy save modeto temporarily stop working and/or a mes-sage in the driver's display regarding thestate of charge of the starter battery maybe temporarily incorrect after an externalstarter battery or battery charger has beenconnected:
The negative battery terminal of thevehicle's starter battery must
never be
used to connect an external starterbattery or battery charger – only thevehicle's negative charging pointshould be used as a grounding point.

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MAINTENANCE AND SERVICE
582
Battery typeH8 AGM
Dimensions, L×W×H 353×175×190 mm (13.9×6.9×7.5 inches)
Capacity (Ah) 95
A
According to EN standard.
B Cold Cranking Amperes.
Volvo recommends that batteries are replaced by an authorized Volvo workshop.
CAUTION
If replacing the battery, make sure you replace it with a battery of the same size,cold start capacity and type as the originalbattery (see the decal on the battery).
Related information
Battery symbols (p. 584)
Hybrid battery (p. 583)
Jump starting using another battery (p. 441)
Reset procedure for pinch protection(p. 165)
Battery recycling (p. 584)

MAINTENANCE AND SERVICE
583
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 battery are discharged, both batteries
must be charged. In such cases, it is notpossible to charge only the hybrid batteryfirst. The starter battery must have a certain level of charge for it to be possible tocharge the hybrid battery.
WARNING
Hybrid battery replacement may only be performed by a workshop – an authorizedVolvo 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 – anauthorized Volvo workshop is recom-mended.
Specifications for hybrid batteryType: Lithium-ion
Power reserve: 11.6 kWh.
NOTE
The capacity of the hybrid battery decrea- ses 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. 584)
Start battery (p. 579)
Charging the hybrid battery (p. 381)
Battery recycling (p. 584)

MAINTENANCE AND SERVICE
584
Battery symbolsThere are warning symbols and information on the batteries.
Wear protective goggles.
See the Owner's Manual
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
Start battery (p. 579)
Hybrid battery (p. 583)
Battery recycling (p. 584)
Battery recycling Start batteries contain lead and must be recy- cled in an environmentally sound manner atthe 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
Start battery (p. 579)
Hybrid battery (p. 583)
Battery symbols (p. 584)

MAINTENANCE AND SERVICE
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585
Fuses and fuseboxes All electrical functions and components are protected by a number of fuses in order toprotect the vehicle's electrical system fromdamage by short circuiting or overloading.
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 possi-bly lead to a fire.
WARNING
Orange wiring may only be handled by qualified personnel.
WARNING
A number of electrical components in Twin Engine Plug-in Hybrid vehicles use high-voltage current and can be extremely dan-gerous if handled incorrectly. Do not touch anything that is not clearly described in the vehicle's Owner's Manual.
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 recommendscontacting an authorized Volvo workshop tohave 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. 585)
Fuses in the trunk (p. 600)
Fuses in the engine compartment (p. 587)
Fuses under the glove compartment(p. 594)
Replacing fuses
All electrical functions and components are protected by a number of fuses in order toprotect the vehicle's electrical system fromdamage 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 toreplace a fuse. This could cause significantdamage to the electrical system and possi-bly lead to a fire.
WARNING
Contact an authorized Volvo workshop for assistance replacing fuses not listed in theOwner's Manual. If fuse replacement isperformed incorrectly, significant damagecan be caused to the electrical system.

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MAINTENANCE AND SERVICE
588Fuse pliers are provided on the inside of the fuse box cover to assist in removing andinserting fuses.
There are also spaces for several extra fuses inthe fusebox.
PositionsThere is a decal with a diagram of the loca-tions of the fuses on the inside of the cover.
Function
Ampere Type
– – Micro
–– Micro
–– Micro
Control module for actuator for engaging/changing gears, automatic transmission 5 Micro
High-voltage coolant heater control module5 Micro
Control module for A/C; heat exchanger cut-off valve; cut-off valve for coolant through the climate system 5 Micro
Hybrid battery control module; high-voltage converter for combined high-voltage generator/starter motor with 500 V– 12 V voltage converter5 Micro
–
– Micro
Converter for controlling feed to rear axle electric motor10 Micro
Hybrid battery control module; high-voltage converter for combined high-voltage generator/starter motor with 500 V– 12 V voltage converter10 Micro
Charge module
5 Micro
Cut-off valve for hybrid battery coolant; coolant pump 1 for hybrid battery15 Micro
Coolant pump for electric drive system15 Micro

MAINTENANCE AND SERVICE
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* Option/accessory.589
Function Ampere Type
Hybrid component cooling fan 25
MCaseA
–
– MCase
–– MCase
–– MCase
Calculation module 5 Micro
–– Micro
–– Micro
–– Micro
–– Micro
Front USB port in tunnel console, front* 5 Micro
12 V outlet in tunnel console, front
15 Micro
12 V outlet in tunnel console between second-row seatsB
12 V outlet in tunnel console, between rear seats C
; USB ports in tunnel console between rear seats C15 Micro
12 V outlet in trunk/cargo compartment
*
USB ports in head restraint right/left C 15 Micro
–
– Micro
Driver-side headlight, LEDD
15 Micro

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MAINTENANCE AND SERVICE
* Option/accessory.
604
Function Ampere Type
Heated rear seat (left side)* 15 Micro
–
– Micro
Blind Spot Information (BLIS)*; Exterior reverse signal control module 5 Micro
–
– Micro
Modules for seat belt tensioners 5 Micro
Emissions system actuator (gasoline, certain engine variants)5 Micro
–– Micro
–– Micro
Heated rear seat (right side)* 15 Micro
–
–
MCaseA
A
This type of fuse should be replaced by a workshop. An authorized Volvo workshop is recommended.
B Excellence
C Only applies to vehicles with hybrid motors or 48 V support batteries.
Related information
Fuses and fuseboxes (p. 585)
Replacing fuses (p. 585)