2012 TOYOTA HIGHLANDER HYBRID cooling

507
4-3. Do-it-yourself maintenance
4
Maintenance and care
11 P/SEAT (PS) 30 A Power seat
12 A/C NO.1 10 A Air conditioning system
13 FUEL OPN 7.5 A Fuel filler door opener
14 S/ROOF 20 A Electric moon roof
15 TAIL 15 A Side marker lights, tail lights,
license plate lights, fog lights, trailer
lights
16 PANEL 7.5 A Glove box light, instrument panel
lights, switch illumination
17 ECU IG NO.1 10 A Multiplex communication system,
electric moon roof, electronically
controlled transmission system,
power back door, seat heaters, tire
pressure warning system, electric
power steering, auto anti-glare
inside rear view mirror, shift lock
system
18 ECU IG NO.2 7.5 A Brake system
19 A/C NO.2 10 A Air conditioning system, electric
cooling fan
20 WASH 20 A Windshield and rear window
washer
21 S-HTR 20 A Seat heaters
22 GAUGE NO.1 10 A Audio system, back-up lights,
emergency flashers, traction con-
trol system, windshield wiper
deicer, rear view monitor system,
power outlet, air conditioning sys-
tem
23 FR WIP 30 A Windshield wipers and washer
24 RR WIP 15 A Rear window wiper and washer
FuseAmpereCircuit

5
When trouble arises
561
5-2. Steps to take in an emergency
CAUTION
■
12-volt battery precautions
The 12-volt battery contains poisonous and corrosive acidic electrolyte,
while related parts contain lead and lead compounds. Observe the following
precautions when handling the 12-volt battery.
●When working with the 12-volt battery, always wear safety glasses and
take care not to allow any battery fluids (acid) to come into contact with
skin, clothing or the vehicle body.
● Do not lean over the 12-volt battery.
● In the event that 12-volt battery fluid comes into contact with the skin or
eyes, immediately wash the affected area with water and seek medical
attention.
Place a wet sponge or cloth over the affected area until medical attention
can be received.
● Always wash your hands after handling the 12-volt battery support, termi-
nals, and other battery-related parts.
● Do not allow children near the 12-volt battery.
■ After recharging the 12-volt battery
Have the 12-volt battery inspected at your Toyota dealer as soon as possi-
ble.
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. 476
NOTICE
■When handling jumper cables
Be careful that the jumper cables do not become tangled in the cooling fans
or belt when connecting or disconnecting the cables.

562
5-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures■ If the needle of the engine coolant temperature gauge enters
the red zone
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Check to see if steam is coming out from the engine area.
If you see steam:
Stop the hybrid system. Carefully lift the hood after the
steam subsides and then restart the hybrid system.
If you do not see steam: Leave the hybrid system operating and carefully lift the
hood.
Check if the cooling fans are operating.
If the fans are operating: Wait until the engine coolant temperature gauge begins to
fall and then stop the hybrid system.
If the fans are not operating: Stop the hybrid system immediately and call your Toyota
dealer.
The following may indicate that your vehicle is overheating:
●The needle of the engine coolant temperature gauge enters the
red zone:
The engine may be overheating.
● “Hybrid System Overheat” is shown on the multi-information dis-
play:
The power control unit may be overheating.
Follow the correction procedure as described below.
STEP1
STEP2
STEP3

5
When trouble arises
563
5-2. Steps to take in an emergency
After the hybrid system has
cooled down, check the engine
coolant level and inspect the
cooling system for leaks.
If the engine compartment cover
needs to be removed. (
P. 463)
Engine coolant reservoir
Radiator
If necessary, add engine coolant
up to the “FULL” line.
Water can be used in an emer-
gency if engine coolant is unavail-
able. ( P. 577)
STEP4
STEP5

564 5-2. Steps to take in an emergency
■If “Hybrid System Overheat” is shown on the multi-informa-
tion display
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Leave the hybrid system operating and carefully lift the hood.
Check if the cooling fans are operating.
If the fans are operating: Wait until “Hybrid System Overheat” disappears and then
stop the hybrid system.
If the message does not disapp ear, call your Toyota dealer.
If the fans are not operating: Stop the hybrid system immediately and call your Toyota
dealer.
After the hybrid system has
cooled down, check the power
control unit coolant level and
inspect the cooling system for
leaks.
If the engine compartment cover
needs to be removed. (P. 463)
Power control unit coolant res-
ervoir
Power control unit coolant
radiator
If necessary, add power control
unit coolant up to the “FULL”
line.
Water can be used in an emer-
gency if power control unit cool-
ant is unavailable. ( P. 577)
STEP1
STEP2
STEP3
STEP4
STEP5

5
When trouble arises
565
5-2. Steps to take in an emergency
Have the vehicle inspected at your
nearest Toyota dealer as soon as
possible.
■ Overheating
The following symptoms may occur when your vehicle is overheating:
●Hybrid system output decreases.
● Steam comes from the engine area.
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 injury such as burns.
● With a hybrid vehicle, there are times when the gasoline engine automati-
cally starts to run or the cooling fans suddenly start to operate. Do not
touch or approach the rotating parts of the belt or fans. Doing so may lead
to fingers, clothes or tools getting caught, resulting in an accidental 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.

577
6-1. Specifications
6
Vehicle specifications
Cooling system
Capacity (Reference)
Gasoline engine
Power control unit 14.2 qt. (13.5 L, 11.8 Imp. qt.)
2.4 qt. (2.3 L, 2.0 Imp. qt.)
Coolant type Use 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 technology
Do not use plain water alone.

623
Alphabetical index
Brakes
Fluid...................................... 471
Parking brake ....................... 194
Brake assist ............................. 234
Break-in tips ............................ 169
Brightness control Instrument panel light control ................................ 197
Care Exterior ................................. 442
Interior .................................. 445
Seat belts ............................. 446
Cargo capacity ........................ 250
Cargo hooks ............................ 428
CD changer .............................. 315
CD player ................................. 315
Chains ...................................... 251
Child restraint system Booster seats, definition ....... 152
Booster seats, installation .... 155
Convertible seats, definition............................. 152
Convertible seats, installation .......................... 155
Front passenger occupant classification system .......... 145
Infant seats, definition .......... 152
Infant seats, installation ........ 155
Installing CRS with a top tether straps ....................... 162
Installing CRS with LATCH anchors .............................. 157
Installing CRS with seat
belts ................................... 159 Child safety
Airbag precautions ................140
Child-protectors .......................66
Child restraint system............151
How your child should wear
the seat belt ........................100
Installing child restraints ........155
Moon roof precautions ..........117
Power window lock switch.....110
Power window precautions ...112
Removed key battery precautions .........................496
Seat belt extender precautions .........................103
Seat belt precautions ............102
Seat heater precautions ........425
12-volt battery precautions .................475, 561
Child-protectors .........................66
Cleaning Exterior ..................................442
Interior ...................................445
Seat belts ..............................446
Clock .........................................203
Compass ...................................436
Condenser ................................470
Console box .............................406
Conversation mirror ................419
Cooling system Hybrid system overheating....562
Cruise control...........................226
Cup holders ..............................408
Curtain shield airbags .............133
Customizable features.............599
C