2012 TOYOTA HIGHLANDER HYBRID cooling

34 1-1. Hybrid system
●If the shift lever is in N, the hybrid battery (traction battery) will not be
charged. When driving in heavy traffic, operate the vehicle with the shift
lever in D to avoid discharging the battery.
● To help prevent the 12-volt battery from becoming discharged, drive the
vehicle at least once a month, and operate the accessories only when
the “READY” indicator is on. When parking the vehicle, make sure the
doors is closed and all lights are turned off.
■ Charging the 12-volt battery
P. 560
■ After the 12-volt battery has di scharged or has been changed or
removed
The gasoline engine may not stop even if the vehicle is running on the hybrid
battery (traction battery). If this continues for a few days, contact your Toyota
dealer.
■ Sounds and vibrations specific to a hybrid vehicle
There may be no engine sounds or vibration even though the vehicle is able
to move. Always shift the shift lever to P when parked.
The following sounds or vibrations may occur when the hybrid system is
operating, and are not a malfunction:
●Motor sounds may be heard from the engine compartment.
● Sounds may be heard from the hybrid battery (traction battery) under the
rear seat when the hybrid system starts or stops.
● Sounds from the hybrid system may be heard when the back door is
open.
● Sounds may be heard from the hybrid transmission when the engine is
started or stopped, or while the engine is idling.
● Engine sounds may be heard when accelerating sharply.
● Sounds may be heard due to regenerative braking when the brake pedal
is depressed or accelerator is loosened.
● Vibration may be felt when the gasoline engine starts or stops.
● Cooling fan sounds may be heard from the air intake vents under the rear
seat.

278
3-1. Using the air conditioning system and defogger
Front manual air conditioning system
Adjusting the settings■ Adjusting the temperature setting
Turn the temperature control dial clockwise (warm) or counter-
clockwise (cool).
If is not pressed, the system will blow ambient temperature air or
heated air.
For quick cooling, turn the temperature selector knob to the “MAX A/C”
position. The air conditioning will automatically turn on in (recir-
culated air) mode.
Fan speed control dial
Air outlet selection dial
Air conditioning on/off switch
Temperature control dial
Outside air or recirculated air mode
Rear air conditioning
on/off switch
: If equipped

457
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
●
Do not touch the engine compartment when the electric cooling fans are
operating.
Vehicles without smart key system: The electric cooling fan may keep
rotating for about 3 minutes even after the engine switch is turned to the
“LOCK” position.
With the engine switch in the “ON” position, the electric cooling fan may
automatically start to run if the air conditioning is on and/or the coolant
temperature is high. Be sure the engine switch is in the “LOCK” position
when working near the electric cooling fan or radiator grille.
Vehicles with smart key system: The electric cooling fan may keep rotating
for about 3 minutes even after the “POWER” switch is OFF.
With the “POWER” switch in ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temper-
ature is high. Be sure the “POWER” switch is OFF when working near the
electric cooling fans or radiator grille.
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from
getting in the eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air. Also a backfire could cause a fire in the engine compart-
ment.
■ If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads
wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, it may indicate a serious pro\
blem.

462
4-3. Do-it-yourself maintenance
Engine compar tment
Washer fluid tank (P. 472)
Brake fluid reservoir ( P. 471)
Engine oil filler cap ( P. 465)
Engine oil level dipstick ( P. 464)
Engine coolant reservoir ( P. 467)Power control unit coolant
reservoir ( P. 468)
Fuse boxes ( P. 497)
Power control unit coolant
radiator ( P. 470)
Electric cooling fans
Condenser ( P. 470)
Engine coolant radiator ( P. 470)

468 4-3. Do-it-yourself maintenance
Power control unit coolant reservoirReservoir cap
“FULL”
“LOW”
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, coolant reservoir cap, drain cock and
water pump.
If you cannot find a leak, have your Toyota dealer test the cap opening pres-
sure and check for leaks in the cooling system.
■ Coolant selection
Only use “Toyota Super Long Life Coolant” or similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant
with long-life hybrid organic acid technology.
U.S.A.: Toyota Super Long Life Coolant is a mixture of 50% coolant and 50% deionized water. (Enabled: -31 F [-35 C])
Canada: Toyota Super Long Life Coolant is a mixture of 55% coolant and 45% deionized water. (Enabled: -44 F [-42 C])
For more details about coolant, contact your Toyota dealer.

469
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
■
When the hybrid system is hot
Do not remove the coolant reservoir cap.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing burns or other injuries.
NOTICE
■When adding coolant
Coolant is neither plain water nor stra ight 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 damage to parts or paint.

470 4-3. Do-it-yourself maintenance
Radiator and condenserCheck the radiators and condens er, and clear away any foreign
objects.
If either of the above parts are ex tremely dirty or you are not sure of
their condition, have your vehicl e checked by your Toyota dealer.
CAUTION
■When the hybrid system is hot
Do not touch the radiators or condenser as they may be hot and may cause
burns.
■ When the electric cooling fan is operating
Do not touch the engine compartment.
Vehicles without smart key system: The electric cooling fans may keep rotat-
ing for about 3 minutes after the engine switch is turned to the “LOCK” posi-
tion.
With the engine switch in the “ON” position, the electric cooling fans may
automatically start to run if the air conditioning is on and/or the coolant tem-
perature is high. Be sure the engine switch is in the “LOCK” position when
working near the electric cooling fan or radiator grille.
Vehicles with smart key system: The electric cooling fan may keep rotating
for about 3 minutes after the “POWER” switch is OFF.
With the “POWER” switch in ON mode, the electric cooling fan may automat-
ically start to run if the air conditioning is on and/or the coolant temperature
is high. Be sure the “POWER” switch is OFF when working near the electric
cooling fan or radiator grille.

502 4-3. Do-it-yourself maintenance
4 HTR50 A Air conditioning system
5 FAN NO.1 50 A Electric cooling fan
6 FAN NO.2 50 A Electric cooling fan
7 ABS NO.1 50 A Brake system
8 RR CLR 40 A Air conditioning system
9 SPARE 40 A Spare fuse
10 RR DEF 30 A Rear window defogger
11 PBD 30 A Power back door
12 HV R/B NO.2 50 A ABS MAIN NO.1, ABS MAIN NO.2,
BATT FAN, OIL PMP
13 HV R/B NO.1 30 A Hybrid system, PCU, IGCT NO.2
IGCT NO.3, INV W/P
14 PD 50 AA/F, HORN, H-LP RH HI, H-LP LH
HI, H-LP RH LO, H-LP LH LO,
S-HORN
15 ABS NO.2 50 A Brake system
16 EPS 80 A Electric power steering
17 DC/DC 150 ARR DOOR RH, RR DOOR LH, FR
FOG, OBD, A/C W/PMP, STOP,
DOOR NO.2, AM1, P/SEAT(PS),
A/C NO.1, FUEL OPN, S/ROOF,
TAIL, PANEL, ECU IG NO.1, ECU
IG NO.2, A/C NO.2, WASH,
S-HTR, GAUGE NO.1, FR WIP,
RR WIP, ECU-ACC, ACC SOCK
NO.1, ACC SOCK NO.2, RADIO
NO.2, P/SEAT, POWER
18 EFI MAIN 30 AMultiport fuel injection system/
sequential multiport fuel injection
system, EFI NO.1, EFI NO.2, EFI
NO.3, F/PMP
19 TOWING 30 A Trailer lights
FuseAmpereCircuit