cooling TOYOTA PRIUS PLUS 2012 User Guide

410 4-3. Do-it-yourself maintenance
PRIUS +_OM_OM47821E_(EE)
Radiator and condenser
Check the radiator and condenser and clear away any foreign
objects.
If either of the above parts is extremely dirty or you are not sure of
their condition, have your vehicle inspected by any authorized Toyota
dealer or repairer, or another duly qualified and equipped profes-
sional.
NOTICE
When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.
CAUTION
When the hybrid system is hot
Do not touch the radiator or condenser as they may be hot and cause seri-
ous injuries, such as burns.

437 4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS +_OM_OM47821E_(EE)
Fuse layout and amperage ratings
Engine compartment
FUSEAmpereCircuit
1 HTR 50A Air conditioning system
2 RDI 30A Electric cooling fans
3 CDS 30A Electric cooling fans
4 S-HORN 10A S-HORN
5 ENG W/P 30A Cooling system
6ABS MAIN
NO.27.5A Anti-lock brake system
7 H-LP CLN 30A Headlight cleaner
8 P-CON MTR 30AP position control system, trans-
mission
9 AMP 30A Audio system
10 IGCT 30A PCU, IGCT NO.2, IGCT NO.3
11 DC/DC-S 5A Inverter and converter

439 4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS +_OM_OM47821E_(EE)
FUSEAmpereCircuit
30 MIR HTR 10A Outside rear view mirror defoggers
31 RAD NO.1 15A Audio system, navigation system
32 DOME 10ADoor courtesy lights, personal
lights, interior lights, front foot
lights, vanity lights, inside rear
view mirror, overhead console
33 ECU-B 7.5ASmart entry & start system, multi-
plex communication system, per-
sonal lights, gauges and meters
34 H-LP LH HI 10A Left-hand headlight (high beam)
35 H-LP RH HI 10A Right-hand headlight (high beam)
36 EFI NO.2 10AMultiport fuel injection system/
sequential multiport fuel injection
system
37 IGCT NO.3 10A Cooling system
38 SPARE 30A Spare fuse
39 SPARE 10A Spare fuse
40 SPARE 7.5A Spare fuse
41 EFI MAIN 20AMultiport fuel injection system/
sequential multiport fuel injection
system, EFI NO.2
42 BATT FAN 10A Battery cooling fan
43 IG2 20AMultiport fuel injection system/
sequential multiport fuel injection
system, MET-IGN, IGN, hybrid
system

441 4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS +_OM_OM47821E_(EE)
FUSEAmpereCircuit
14 STOP 10AStop lights, high mounted stop-
light, brake system, driver support
system
15 P FR DOOR 25A Power windows
16 D FR DOOR 25A Power windows
17 DOOR RR 25A Power windows
18 DOOR RL 25A Power windows
19 S/ROOF 30A Panoramic roof shades
20 ECU-IG NO.1 10AElectric cooling fans, multiplex
communication system
21 ECU-IG NO.2 10ADriver support system, Pre-crash
safety System, inside rear view
mirror, yaw rate & G sensor, brake
system, electric power steering,
navigation system, panoramic roof
shades, seat belt pretensioners,
audio system, emergency flash-
ers, turn signal lights, windshield
wipers, headlight cleaner
22 GAUGE 10AHeadlight leveling system, seat
belt reminder light, gauges and
meters
23 A/C 10A Air conditioning system
24 WASHER 15A Windshield washer
25 RR WIP 20A Rear window wiper and washer

5
527 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)
CAUTION
After recharging the 12-volt battery
Have the 12-volt battery inspected at any authorized Toyota dealer or
repairer, or another duly qualified and equipped professional as soon as
possible.
If the 12-volt battery is deteriorating, continued use may cause the 12-volt
battery to emit a malodorous gas, which may be detrimental to the health of
passengers.
When replacing the 12-volt battery
P. 417
NOTICE
When handling jumper cables
When connecting the jumper cables, ensure that they do not become entan-
gled in the cooling fans, etc.
Exclusive jump starting terminal
The exclusive jump starting terminal is to be used when charging the 12-volt
battery from another vehicle in an emergency. It cannot be used to jump start
another vehicle.

5
529 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)After the hybrid system has
cooled down sufficiently, inspect
the hoses and radiator core
(radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact any autho-
rized Toyota dealer or repairer, or
another duly qualified and
equipped professional.
The coolant level is satisfactory if
it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL”
“LOW”
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
STEP 3
STEP 4
STEP 5

530 5-2. Steps to take in an emergency
PRIUS +_OM_OM47821E_(EE)Start the hybrid system and turn the air conditioning system
on to check that the radiator cooling fans operate and to
check for coolant leaks from the radiator or hoses.
The fans operate when the air conditioning system is turned on
immediately after a cold start. Confirm that the fans are operating by
checking the fan sound and air flow. If it is difficult to check these,
turn the air conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the hybrid system immediately and contact any autho-
rized Toyota dealer or repairer, or another duly qualified and
equipped professional.
If the fans are operating:
Have the vehicle inspected at the nearest any authorized
Toyota dealer or repairer, or another duly qualified and
equipped professional.
STEP 6
STEP7

5
531 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)If the hybrid system overheat warning light comes on
Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has
cooled down, inspect the hoses
and radiator core (radiator) for
any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact any autho-
rized Toyota dealer or repairer, or
another duly qualified and
equipped professional.
STEP 1
STEP 2
STEP 3

5
533 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)
CAUTION
To prevent an accident or injury when inspecting under the hood of
your vehicle
If steam is seen coming from under the hood, do not open the hood until
the steam has subsided. The engine compartment may be very hot, caus-
ing serious injuries such as burns.
Check that the indicator on the “POWER” switch and the “READY” indica-
tor are off.
On hybrid vehicles, the gasoline engine may automatically start, or the
cooling fans may suddenly operate even if the gasoline engine stops. Do
not touch or approach rotating parts such as the fans, which may lead to
fingers or clothing (especially a tie, a scarf or a muffler) getting caught,
resulting in serious injury.
Do not loosen the coolant reservoir cap while the hybrid system and radia-
tor are hot.
Serious injury, such as burns, may result from hot coolant and steam
released under pressure.
NOTICE
When adding engine/power control unit coolant
Wait until the hybrid system has cooled down before adding engine/power
control unit coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid sys-
tem too quickly can cause damage to the hybrid system.
To prevent damage to the cooling system
Observe the following precautions:
Avoid contaminating the coolant with foreign matter (such as sand or dust
etc.)
Do not use any coolant additives other than the Toyota genuine or similar
coolant additives

547 6-1. Specifications
6
Vehicle specifications
PRIUS +_OM_OM47821E_(EE)
Cooling system
Ignition system
Capacity
Gasoline
engine
Without an exhaust heat recovery system
6.5 L (6.9 qt., 5.7 Imp.qt.)
With an exhaust heat recovery system
6.9 L (7.3 qt., 6.1 Imp.qt.)
Power
control
unit2.7 L (2.9 qt., 2.4 Imp.qt.)
Coolant typeUse either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-
silicate, non-amine, non-nitrite, and non-borate
coolant with long-life hybrid organic acid technol-
ogy
Do not use plain water alone.
Spark plug
Make DENSO SC20HR11
Gap 1.1 mm (0.043 in.)
NOTICE
Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.