2022 TOYOTA PRIUS PRIME coolant temperature

6738-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47E74U_(U)
8
When trouble arises
Slip indicator lightIndicates a malfunction in:
• The VSC system;
• The TRAC system; or
• The hill-start assist control system
 Have the vehicle inspected by your Toyota dealer
immediately.
The light will flash when the ABS, VSC or TRAC system is
operating.
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. 718)
• 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)
PKSB OFF indicator
Indicates a malfunction in the Parking Support Brake func-
tion
 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 Parking Support Brake function is turned off ( P. 453)
• The light will come on when the Parking Support Brake function is operating ( P. 457)
• The light will flash when the system cannot be temporar- ily used ( P. 459)
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.
Warning lightWarning light/Details/Actions

718
PRIUS PRIME_OM_OM47E74U_(U)
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. 673) 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
1
2
3
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2

7198-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47E74U_(U)
8
When trouble arises
The coolant level is satisfactory if it is between the “MAX” and
“MIN” lines on the reservoir.
Reservoir
“MAX” line
“MIN” 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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1
2
3
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6
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7218-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47E74U_(U)
8
When trouble arises
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 Toyota
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 “Ac cessory”,
“Ignition ON” or mileage display ( P. 210) 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 the 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.
6

790Alphabetical index
PRIUS PRIME_OM_OM47E74U_(U)
Front seats ............................... 296Adjustment ............................ 296
Cleaning................................ 579
Correct driving posture ........... 28
Head restraints ..................... 300
Seat heaters ......................... 535
Front side marker lights.......... 347 Light switch ........................... 347
Replacing light bulbs............. 657
Front turn signal lights ........... 345 Replacing light bulbs............. 657
Turn signal lever ................... 345
Fuel ........................................... 365 Capacity ................................ 728
Fuel gauge ............................ 209
Information ............................ 735
Refueling............................... 365
Type ...................................... 728
Warning light ......................... 673
Fuel consumption.... 233, 264, 269
Average fuel consumption .... 233
Current fuel consumption...... 269
Fuel filler door.......................... 365
Opener .................................. 367
Refueling............................... 365
When the fuel filler door cannot be opened............... 368
Fuses ........................................ 647
Garage door opener ................ 564
Glove box ................................. 541 Hands-free system (for
cellular phone)
*
Head restraints ........................ 300
Head-up display....................... 253
Headlights ................................ 347
AHB (Automatic High Beam)................................. 352
Headlight aim................ 650, 777
Light switch ........................... 347
Replacing light bulbs ............ 657
Heated steering wheel ............ 535
Heaters
Automatic air conditioning system.... 508, 520
Heated steering wheel .......... 535
Hybrid battery (traction battery) ............................... 136
Outside rear view mirrors ........................ 512, 523
Seat heaters ......................... 535
High coolant temperature warning light.......................... 673
High mounted stoplight
Replacing.............................. 657
High-voltage components ........ 99
Hill-start assist control ........... 497
Hood ......................................... 595
Hooks Coat hooks ........................... 562
Grocery bag hook ................. 546
Retaining hooks (floor mat) .... 26
Horn .......................................... 303
HV mode ..................................... 87
G
H

799Alphabetical index
PRIUS PRIME_OM_OM47E74U_(U)
Vanity lights ............................. 549Wattage ................................ 734
Vanity mirrors .......................... 549
Vehicle data recording .............. 10
Vehicle identification number ................................... 727
Vehicle proximity notification system ...................................... 93
Vehicle Stability Control (VSC) ...................................... 496
Voice command system
*
VSC (Vehicle Stability
Control) .................................. 496
Warning buzzers Approach warning ................. 419
Brake system ....... ................. 671
Intuitive parking assist .......... 444
LTA (Lane Tracing Assist) .... 395
Open door ..................... 283, 673
Parking Support Brake function ............................... 457
Pre-collision warning............. 379
Radar cruise control.............. 419
RCTA (Rear Cross Traffic Alert) ................................... 427
RSA (Road Sign Assist)........ 405
Seat belt reminder ................ 674
Shift position ......................... 341 Warning lights ......................... 202
ABS ...................................... 672
Brake Override System ........ 675
Brake system ....... ................. 671
Charging system................... 671
Drive-Start Control ................ 675
Driver’s seat belt reminder light..................................... 674
Electronic engine control system .......... ...................... 671
Electric power steering
system .......... ...................... 672
Front passenger’s seat belt reminder light ..................... 674
High coolant temperature ..... 673
Low engine oil pressure........ 671
Low fuel level ........................ 673
Malfunction indicator lamp .... 671
Master warning light ............. 674
Open door............................. 673
Parking Support Brake function............................... 675
PCS ...................................... 672
PKSB OFF indicator ............. 673
Rear passengers’ seat belt
reminder light ..................... 674
Seat belt reminder light......... 674
Slip indicator ......................... 673
SRS ...................................... 672
Tire pressure ........................ 674
V
W
*: Refer to “NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.