2019 TOYOTA PRIUS PRIME coolant temperature

6628-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47D13U_(U)
High coolant temperature warning light• When the light flashes:Indicates that the engine coolant temperature is too high
The light changes from a flashing to a solid light when
the temperature further increases
 Immediately stop the vehicle in a safe place. ( P. 707)
• When the light comes on without flashing: Indicates a malfunction in the exhaust heat recirculator
system
 Have the vehicle inspected by your Toyota dealer
immediately.
(Flashes)
(If equipped)
ICS OFF indicator
Indicates a malfunction in the Intelligent Clearance Sonar
function
 Have the vehicle inspected by your Toyota dealer.
The warning light will operate as follows, even when the
system is not malfunctioning:
• The light will come on when the Intelligent Clearance Sonar function is turned off ( P. 440)
• The light will come on when the Intelligent Clearance
Sonar function is operating ( P. 444)
• The light will flash when the system cannot be temporar- ily used ( P. 448)
Open door warning light (warning buzzer)*3
Indicates that a door is not fully closed
 Check that all the doors are closed.
Low fuel level warning light
Indicates that remaining fuel is approximately 1.7 gal.
(6.4 L, 1.4 Imp.gal.) or less
 Refuel the vehicle.
Driver’s and front passenger’ s seat belt reminder light
(warning buzzer)
*4, 5
Warns the driver and/or front passenger to fasten their
seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front
passenger’s seat belt also needs to be fastened to
make the warning light (warning buzzer) turn off.
Warning lightWarning light/Details/Actions

707
PRIUS PRIME_OM_OM47D13U_(U)
8
When trouble arises
8-2. Steps to take in an emergency
If your vehicle overheats
■If the high coolant temperature warning light comes on or
flashesStop the vehicle in a safe place and turn off the air conditioning
system, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has cooled down sufficiently, inspect t he
hoses and radiator core (ra diator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
your Toyota dealer.
The following may indicate that your vehicle is overheating.
● The high coolant temperature warning light ( P. 662) comes on
or flashes, or a loss of hybrid system power is experienced. (F or
example, the vehicle s peed does not increase.)
● “Hybrid System Overheated” is shown on the multi-information
display.
● Steam comes out from under the hood.
Correction procedures
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2
3
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2

7088-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47D13U_(U)
The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
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 t he radiator or hoses.
The fans operate when the temperature setting is adjusted to “LO” and
“A/C” switch (
*1 • *2) 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 “A/C” switch
(
*1 • *2) on and off repeatedly. (The fans may not
operate in freezing temperatures.)
*1: Vehicles with 7-inch display
*2: Vehicles with 11.6-inch display
If the fans are not operating:
Stop the hybrid system immediately and contact your Toyota
dealer.
If the fans are operating:
Have the vehicle inspected at the neare st Toyota dealer.
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2
3
5
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7108-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47D13U_(U)
After stopping the hybrid system and waiting for 5 minutes or
more, start the hybrid system again and check if “Hybrid System
Overheated” is shown on the multi-information display.
If the message d oes not disappear:
Stop the hybrid system and contact your Toyota dealer.
If the message is not displayed:
The hybrid system temperature has dropped and the vehicle may
be driven normally.
However, if the message appears again frequently, contact your To y o t a
dealer.
WARNING
■ To prevent an accident or injury when inspecting under the hood of
your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
● If steam is seen coming from under the hood, do not open the ho od until
the steam has subsided. The engine compartment may be very hot.
● After the hybrid system has been turned off, check that the “Accessory”,
“Ignition ON” or mileage display ( P. 205) on the main display and the
“READY” indicator are off.
When the hybrid system is operating, the gasoline engine may au tomati-
cally start, or the cooling fans may suddenly operate even if the gasoline
engine stops. Do not touch or approach rotating parts such as t he fan,
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 caps while the hybrid syste m and radi-
ator are hot.
High temperature steam or coolant could spray out.
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778Alphabetical index
PRIUS PRIME_OM_OM47D13U_(U)
Front seats ............................... 295Adjustment ............................ 295
Cleaning................................ 567
Correct driving posture ........... 28
Head restraints ..................... 299
Seat heaters ......................... 522
Front side marker lights.......... 346 Light switch ........................... 346
Replacing light bulbs............. 646
Front turn signal lights ........... 344 Replacing light bulbs............. 646
Turn signal lever ................... 344
Fuel ........................................... 364 Capacity ................................ 718
Fuel gauge ............................ 204
Information ............................ 725
Refueling............................... 364
Type ...................................... 718
Warning light ......................... 662
Fuel consumption.... 226, 258, 264
Average fuel consumption .... 226
Current fuel consumption...... 264
Fuel filler door.......................... 364
Opener .................................. 366
Refueling............................... 364
When the fuel filler door cannot be opened............... 367
Fuses ........................................ 636
Garage door opener ................ 553
Glove box ................................. 528 Hands-free system
(for cellular phone)
*
Head restraints ........................ 299
Head-up display....................... 246
Headlights ................................ 346
Automatic High Beam system .......... ...................... 351
Headlight aim................ 639, 764
Light switch ........................... 346
Replacing light bulbs ............ 646
Heated steering wheel ............ 523
Heaters
Automatic air conditioning system.... 496, 507
Heated steering wheel .......... 523
Outside rear view mirrors ........................ 500, 511
Seat heaters ......................... 522
High coolant temperature warning light.......................... 662
High mounted stoplight Replacing.............................. 646
High-voltage components ........ 96
Hill-start assist control ........... 486
Hood ......................................... 583
Hooks Coat hooks ........................... 552
Grocery bag hook ................. 533
Retaining hooks (floor mat) .... 26
Horn .......................................... 302
HV mode ..................................... 85
G
H

787Alphabetical index
PRIUS PRIME_OM_OM47D13U_(U)
Warning lights.......................... 197ABS....................................... 661
Brake Override System......... 664
Brake system ....... ................. 660
Charging system ................... 660
Drive-Start Control ................ 664
Driver’s seat belt reminder .... 662
Electronic engine control
system ......... ....................... 660
Electric power steering ......... 661
Front passenger’s seat belt reminder ...................... 662
High coolant temperature ..... 662
ICS OFF indicator ................. 662
Intelligent Clearance Sonar .................................. 664
Low engine oil pressure ........ 660
Low fuel level ........................ 662
Malfunction indicator lamp .... 660
Master warning light.............. 663
Open door ............................. 662
PCS ...................................... 661
Rear passengers’ seat belt
reminder ............................. 663
Seat belt reminder light ......... 662
Slip indicator ......................... 661
SRS ...................................... 661
Tire pressure......................... 663 Warning messages.................. 670
Warning reflector storage
space ...................................... 533
Washer ..................................... 358 Checking............................... 598
Preparing and checking
before winter ...................... 491
Switch ................................... 358
Washing and waxing ............... 562
Water-repellent coating .......... 563
Weights .................................... 716 Cargo capacity...................... 329
Load limits ............................ 716
Wheels ...................................... 612
Replacing wheels ................. 615
Size....................................... 723
Window glasses ...................... 308
Window lock switch ................ 308
Windows................................... 308 Power windows..................... 308
Rear window
defogger ..................... 500, 511
Washer ................................. 358
Windshield wipers ................... 358 Handling the wiper arms ....... 566
Rain-sensing windshield wipers ................................. 360
Replacing the wiper rubber... 630
Winter driving tips ................... 491
Wiper rubber replacement ...... 630
Wireless charger ..................... 541
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.