2023 TOYOTA TUNDRA HYBRID overheating

4095-1. Using the air conditioning system and defogger
Owners Manual_USA_M0C052_en
5
Interior features
WARNING
■To prevent overheating and
minor burn injuries
Observe the following precautions
when using the seat heaters.
●Do not cover the seat with a
blanket or cushion when using
the seat heater.
●Do not use seat heater more
than necessary.

5017-2. Steps to take in an emergency
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7
When trouble arises
■Brake system warning light (warning buzzer)
■Brake system warning light (warning buzzer)
■High coolant temperature warning light*
*: This light illuminates on the mu lti-information display with a message.
If a war ning light tur ns on or a war ning buzzer
sounds
Calmly perform the following actions if any of the warning
lights comes on or flashes. If a light comes on or flashes, but
then goes off, this does not necessarily indicate a malfunc-
tion in the system. However, if this continues to occur, have
the vehicle inspected by your Toyota dealer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
(U.S.A.)
or
(Red)
(Canada)
Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer. C ontinuing to drive the vehi-
cle may be dangerous.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in:
 The parking brake system;
 The regenerative braking system; or
 The electronically controlled brake system
 Have the vehicle inspecte d by your Toyota dealer
immediately.
Warning lightDetails/Actions
Indicates that the engine is overheating
 Immediately stop the v ehicle in a safe place.
Handling method ( P.535)

5357-2. Steps to take in an emergency
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7
When trouble arises
■If the engine coolant tem-
perature gauge enters the
red zone or “Engine Cool-
ant Temp High Stop in a
Safe Place See Owner’s
Manual” is shown on the
multi-information display
1 Stop the vehicle in a safe
place and turn off the air con-
ditioning system, and then
stop the hybrid system.
2 If you see steam:
Carefully lift the hood after
the steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the hybrid system has
cooled down sufficiently,
inspect the hoses, engine
radiator core (radiator) and
intercooler radiator core
(radiator) for any leaks.
If a large amount of coolant leaks,
immediately cont act your Toyota dealer.
Cooling fan
Radiator
Intercooler radiators
4 The coolant level is satisfac-
tory if it is between the “F” or
“FULL” and “L” or “LOW”
lines on the reservoir.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
The needle of the engine coolant temperature gauge ( P.91)
enters the red zone or a loss of engine (hybrid system) power i s
experienced. (For example, the vehicle speed does not
increase.)
 “Engine Coolant Temp High Stop in a Safe Place See Owner’s
Manual” is shown on the multi-information display.
Steam comes out from under the hood.
Correction procedures

Owners Manual_USA_M0C052_en
Alphabetical Index595
Seat belt extender precautions............................................. 30
Seat belt precautions ............. 52
Child-protectors .. ................... 116
Cleaning .......................... 442, 445 Aluminum wheel ornaments . 442
Aluminum wheels ................. 442
Exterior ................................. 442
Interior .................................. 445
Radar sensor........................ 226
Seat belts ............................. 445
Clock ......................................... 91
Coat hooks .............................. 426
Condenser .............................. 461
Console box ............................ 415
Console box light ................... 410
Consumption screen.............. 106
Coolant .................................... 460 Checking .............................. 460
Cooling system ...................... 460 Engine overheating .............. 535
Coussins gonflables Modification et é limination en fin
de vie des coussins gonflables ........................................... 583
Crawl Control .......................... 365
Cruise control Dynamic radar cruise control with full-speed range .......... 256
Cup holders ............................ 414
Current fuel consumption ....... 97
Curtain shield airbags ............. 36
Customizable features ........... 561D
DAC ..........................................372
Daytime running light system211
Daytime running lights Replacing light bulbs ............490
Deck divider ............................417
Defogger Outside rear view mirrors .....401
Rear window.........................401
Windshield ............................401
Differential ...............................546
Digital Rear-view Mirror .........146
Dimension ...............................540
Dinghy towing .........................194
Display Dynamic radar cruise control with full-speed range ..........256
Head-up display ...................102
Intuitive parking assist ..........274
LTA (Lane Tracing Assist) .....248
Multi-information display.........95
Warning messages ............... 511
Display change button .............93
Distance until next engine oil change .....................................93
Do-it-yourself maintenance ...449
Door courtesy lights...............410
Door lock Side doors ............................ 113
Smart key system .................128
Wireless remote control........ 111
Doors Automatic door locking and unlocking system ................ 116
Door glasses ........................160
Door lock .............................. 113
Open door warning buzzer . 114, 11 6
Outside rear view mirrors .....155
Rear door child-protectors .... 116
Side doors ............................ 113

Owners Manual_USA_M0C052_en
Alphabetical Index597
........................................... 499
If your vehicle becomes stuck ........................................... 538
If your vehicle has to be stopped in an emergency................. 494
If your vehicle needs to be towed ........................................... 497
If your vehicle overheats ...... 535
Engine ..................................... 542 ACC...................................... 198
Compartment ....................... 457
How to start the hybrid system........................................... 195
If the hybrid sy stem will not start
........................................... 524
If your vehicle has to be stopped in an emergency................. 494
Overheating.......................... 535
Power switch ........................ 195
Engine coolant ....................... 460 Capacity ............................... 544
Checking .............................. 460
Preparing and c hecking before
winter.................................. 395
Engine coolant temperature gauge....................................... 91
Engine oil Capacity ............................... 543
Checking .............................. 458
Warning light ........................ 502
Engine oil pressure gauge ...... 91
Engine switch (power switch)195 Auto power off function ........ 198
Changing the power switch modes ................................ 198
If your vehicle has to be stopped in an emergency................. 494
Starting the hybrid system.... 195
Enhanced Vehicle Stability Con- trol (Enhanced VSC) ............ 375
Enhanced VSC (Enhanced Vehi- cle Stability Control) ............ 375 EPS (Electric Po
wer Steering)
...............................................375 Warning light.........................503
Event data recorder (EDR) .........8
F
Flat tire.....................................515 Tire pressure w arning system
...........................................468
Floor mats .................................26
Fluid Automatic transm ission ........545
Brake ....................................546
Washer .................................462
Fog light Replacing light bulbs ............490
Switch ...................................214
Footwell lights ........................410
Four-wheel drive system .......361
Front fog light Replacing light bulbs ............490
Front passenger occupant clas- sification system ....................46
Front seats ..............................133 Adjustment ...........................133
Cleaning ...............................445
Correct driving posture ...........27
Driving position memory .......137
Head restraints .....................140
Memory recall function .........139
Power easy access system ..137
Seat heaters ....... ..................407
Seat position memory...........137
Seat ventilators.....................407
Front tray light ........................410
Front turn signal lights ..........204 Turn signal lever ...................204
Front turn signal/parking lights Replacing light bulbs ............490
Wattage ................................548
Fuel Capacity ...............................542

Owners Manual_USA_M0C052_en
Alphabetical Index601
Multi-terrain Select ................. 369
N
Navigation system-linked display......................................... 98, 102
O
Odometer .................................. 93
Odometer and trip meter display Display change button............ 93
Display items .......................... 93
Off-road precautions .............. 392
Oil Differential oil ....................... 546
Engine oil ............................. 543
Transfer oil ........................... 545
Opener Hood..................................... 456
Opening the fuel tank cap .... 222
Tailgate ................................. 121
Outside rear view mirrors Adjustment ........................... 155
BSM (Blind Spot Monitor)..... 267
Folding ................................. 156
Mirror position memory ........ 137
Outside rear view mirror defog-gers .................................... 401
RCTA (Rear Cross Traffic Alert) ........................................... 281
Outside temperature ........ 91, 105
Overheating ............................ 535
P
Panic mode ............................. 112
Panoramic moon roof ............ 164
Panoramic view monitor ........ 310 Camera switch ..................... 312
Checking around the vehicle 315
Checking the bed ................. 329
Checking the front and around the vehicle ..........................316
Checking the rear and around the vehicle ..........................320
Customizing the panoramic view monitor ...............................330
Display..................................313
Driving precautions ...............310
Magnifying function ..............329
Menu button .........................312
Panoramic view monitor precau- tions ....................................330
Things you should know .......341
Parking assist sens ors (intuitive
parking assist) ......................274
Parking brake ..........................205 Brake system warning light ..501
Parking brake engaged warning buzzer.................................207
Warning light.........................506
Warning message.................207
Parking lights Light switch........................... 211
Parking Support Brake (PKSB) ...............................................287Enabling/disabling the system ...........................................289
Parking Support Brake function (rear-crossing vehicles) ......295
Parking Support Brake function (static objects) ....................292
Warning lights .......................504
Warning message.................291
PCS (Pre-Collision System) ...230 Enabling/disabling the system...........................................234
Function................................230
Warning light.........................503
Personal lights ........................410
Pitch and roll gauges ...............94
PKSB (Parking Support Brake) ...............................................287Enabling/disabling the system