2022 TOYOTA TUNDRA HYBRID overheating

3854-5. Using the driving support systems
Owners Manual_USA_M0C031_en
4
Driving
Straight Path Assist. Straight
Pass Assist controls steering to
back up the trailer in a straight-
line. The system can be overrid-
den by using steering wheel to
adjust trailer direction.
The driver is always responsible
for paying attention to the vehi-
cle’s surroundings and driving
safely. This system does not
control braking. Driver needs to
control vehicle speed, control
braking, and stop the vehicle to
avoid any collision.
For best results, reverse slowly
when using Straight Path Assist.
 Trailer Backup Guide system
is canceled when the trailer
cannot be detected (e.g. dirty
camera lens, insufficient light-
ing condition, obstruction of
the trailer in the rear camera
view, incorrectly selected
trailer, etc.)
 Guidance mode is canceled
when any of the following
occurs:
• Press the Trailer Backup Guide
switch
*
• Press the Camera switch*
• Vehicle speed is greater than approximately 4.7 mph (7.6 km/h)
• VSC or ABS is operated
*
• Tailgate is opened*
• Trailer tracking is lost • Shift the shift lever out of R
• There is a system malfunction
*
*
: Includes Trailer Backup Guide system cancel
 Straight Path Assist is can-
celed when any of the follow-
ing occurs:
• Any of the events, above, that
cancel Guidance mode occur
• Press the Straight Path Assist switch on the multimedia screen
• The system temperature preser- vation function operates (to pre-
vent power steering equipment
from overheating)
This light’s usage for Trailer
Backup Guide is controlled by
the Trailer Backup Guide sys-
tem and the driver does not
need to activate the light sepa-
rately.
For other usage: P. 4 1 1
Canceling the system
Trailer hitch light

4095-1. Using the air conditioning system and defogger
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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
Owners Manual_USA_M0C031_en
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_M0C031_en
Alphabetical Index597
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 .......... 255
Cup holders ............................ 414
Current fuel consumption ....... 97
Curtain shield airbags ............. 36
Customizable features ........... 561
D
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 ..........255
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 .....156
Rear door child-protectors .... 116
Side doors ............................ 113
Downhill assist control system ...............................................372
Drive distance ...........................98
Drive information ......................98
Drive-start control ..................177

598Alphabetical Index
Owners Manual_USA_M0C031_en
Driving ..................................... 171 Break-in tips ......................... 172
Correct driving posture ........... 27
Hybrid Electric Vehicle driving tips...................................... 390
Procedures ........................... 171
Winter drive tips ................... 395
Driving information display ..... 97
Driving mode sel ect switch ... 358
Driving position memory ....... 137 Memory recall function ......... 139
Power easy access system .. 137
Driving range ............................ 97
Dynamic radar cruise control with full-speed range ........... 255Approach warning ................ 263
Warning message ................ 265
E
ECB (Electronically Controlled Brake System) ...................... 374Warning light ........................ 501
EDR (Event data recorder)......... 8
Elapsed time ............................. 98
Electric motor (traction motor)73
Electric Power Steering (EPS) ............................................... 375Warning light ........................ 503
Electronic key ......................... 110 Battery-saving function......... 129
If the electronic key does not operate properly ................. 527
Replacing the battery ........... 485
Electronic sunshade .............. 164
Electronically Controlled Brake System (ECB) ....................... 374Warning light ........................ 501
Electronically modulated air sus- pension ................................. 355
Emergency flashers ............... 494
Emergency tire puncture ....... 515 Emergency, in case of
If a warning buzzer sounds ..501
If a warning light turns on .....501
If a warning message is dis-played ................................. 511
If the 12-volt battery is dis- charged ..............................529
If the electronic key does not operate properly .................527
If the fuel door cannot be opened ...........................................526
If the hybrid sys tem will not start
...........................................524
If the vehicle is submerged or water on the road is rising ..495
If you have a flat tire .............515
If you lose your keys.............526
If you think something is wrong ...........................................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 ove rheats ......535
Engine......................................542 ACC ......................................198
Compartment........................457
How to start the hybrid system...........................................195
If the hybrid sys tem 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 checking before winter ..................................395

Owners Manual_USA_M0C031_en
Alphabetical Index603
OpenerHood..................................... 456
Opening the fuel tank cap .... 222
Tailgate ................................. 121
Outside rear view mirrors Adjustment ........................... 156
BSM (Blind Spot Monitor)..... 267
Folding ................................. 157
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 sensors (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 ...........................................289
Parking Support Brake function (rear-crossing vehicles) ......295
Parking Support Brake function (static objects) ....................292
Warning lights .......................504
Warning message.................291
Power back window ...............163
Power bed step .......................126
Power control unit ....................76
Power control unit coolant ....460 Capacity ...............................544
Checking ..............................460
Power easy access system ...137
Power outlet ............................426