2021 TOYOTA TUNDRA warning light

4997-2. Steps to take in an emergency
7
When trouble arises
Indicates a malfunction in the Drive-start control.A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates that the shift position was changed and
Drive-Start Control was operated while depress-
ing the accelerator pedal.
Momentarily release the accelerator pedal.
(Flashes)
Indicates that the headlight switch is left on (with
the key removed and the driver’s door opened)
A buzzer also sounds.
 Turn the lights off.
Indicates a malfunction in:
• The automatic headlight leveling system; or
• The LED headlight system (if equipped).
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates a malfunction in the Automatic High
Beam system.
Have the vehicle inspected by your Toyota
dealer.
Indicates that the tire inflation pressure is low.
Check the tire inflation pressure, and
adjust to the appropriate level.
(If equipped)
Indicates that the Automatic High Beam switch is
pressed while the headlights are in low beam.
Turn the high beam on and press the Auto-
matic High Beam switch again.
Warning messageDetails/Actions
Drive-Start
Control
Malfunction
Visit Your Dealer
Release
Accelerator
Turn Lights Off
Headlight System Malfunction
Visit Your Dealer
Headlight System Malfunction
Visit Your Dealer
Tire Pressure Low Check Tire
Auto High Beam Ready Turn ON High Beam to
Activate

5027-2. Steps to take in an emergency
After taking the specified steps to correct the suspected problem,
check that the warning m essage and light go off.
Have the malfunction repaired immediately. (vehicles with a
smart key system)
Interior
buzzerExterior buzzerWarning messageDetails/Actions
Contin-
uous  The driver’s door was opened
when the shift lever was not in
P and the engine switch was
not turned off.

Shift the shift lever to P.
Contin-
uousContin-
uous
The driver’s door was opened
and closed while the elec-
tronic key was not in the vehi-
cle, the shift lever was not in P
and the engine switch was not
turned off.
Shift the shift lever to P.
 Bring the electronic key
back into the vehicle.
Once3 times
The driver’s door was opened
and closed while the elec-
tronic key was not in the vehi-
cle, the shift lever was in P
and the engine switch was not
turned off.
Turn the engine switch
off.
 Bring the electronic key
back into the vehicle.
The electronic key was carried
outside the vehicle and a door
other than the driver’s door
was opened and closed while
the engine switch was in a
mode other than off.
Bring the electronic key
back into the vehicle.
Shift into P Position
(Flashes)
Shift into P Position
Key Not Detected
(Flashes)
Key Not Detected
(Flashes)

5187-2. Steps to take in an emergency
Confirm it is not loose after
tightening:Push and pull the tire
Try rotating
Visually check to ensure tire is
not hung on surrounding parts.
If looseness or misassembly ex ists, repeat step and step .
Repeat step , any time the tire is lowered or disturbed.
Stow the tools and jack securely.
■The temporary spare tire
●The temporary spare tire is iden tified by the “TEMPORARY USE ON LY ”
marking on the disc wheel and/or tire sidewall.
Use the temporary spare tire temp orarily, and only in an emergency.
●Make sure to check the tire inflation pressure of the temporary spare
tire. ( P. 5 4 8 )
■When reinstalling the wheel ornament (on some models)
P. 4 4 6
■When using the temporary spare tire
As the temporary spare tire is no t equipped with the tire pressure warning
valve and transmitter, low inflation pressure of the spare tire will not be
indicated by the tire pressure warning system. Also, if you rep lace the
temporary spare tire after the tire pressure warning light come s on, the
light remains on.
■If you have a flat rear tire on a road covered with snow or ice
Install the temporary spare tire on one of the front wheels of the vehicle.
Perform the following steps and f it tire chains to the rear tires:
Replace a front tire with the temporary spare tire.
Replace the flat rear tire with the tire removed from the front of the
vehicle.
Fit tire chains to the rear tires.
3
1
2
23
43
5
1
2
3

5277-2. Steps to take in an emergency
7
When trouble arises
■When recharging or replacing the battery
●Vehicles with a smart key system: In some cases, it may not be possible to
unlock the doors using the smart key system when the battery is dis-
charged. Use the wireless remote control or the mechanical key to lock or
unlock the doors.
● The engine may not start on the first attempt after the battery has recharged
but will start normally after the second attempt. This is not a malfunction.
● Vehicles with a smart key system: The engine switch mode is mem orized by
the vehicle. When the battery is reconnected, the system will r eturn to the
mode it was in before the battery was discharged. Before discon necting the
battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery dis-
charged, be especially careful when reconnecting the battery.
WARNING
■ Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally ignit ing the flam-
mable gas that may be emitted from the battery:
● Make sure each jumper cable is connected to the correct terminal and that
it is not unintentionally in contact with any other than the in tended terminal.
● Do not allow the + and - clamps of the jumper cables to come into contact
with each other.
● Do not smoke, use matches, cigarette lighters or allow open fla me near
the battery.
■ Battery precautions
The battery contains poisonous and corrosive acidic electrolyte , while
related parts contain lead and lead compounds. Observe the foll owing pre-
cautions when handling the battery:
● When working with the battery, always wear safety glasses and t ake care
not to allow any battery fluids (acid) to come into contact wit h skin, clothing
or the vehicle body.
● Do not lean over the battery.
● In the event that battery fluid comes into contact with the skin or eyes,
immediately wash the affected area with water and seek medical attention.
Place a wet sponge or cloth over the affected area until medica l attention
can be received.
● Always wash your hands after handling the battery support, term inals, and
other battery-related parts.
● Do not allow children near the battery.

596What to do if... (Troubleshooting)
●Vehicles without a smart key system:
It is locked to prevent theft of the vehicle if the key is removed from the
engine switch. ( P. 218)
●Vehicles with a smart key system:
It is locked automatically to prevent theft of the vehicle. ( P. 222)
●Is the window lock switch pressed?
The power window except for the one at the driver’s seat cannot be oper-
ated if the window lock switch is pressed. ( P. 172)
●The auto power off function will be operated if the vehicle is left in ACC or
ON (the engine is not running) for a period of time. ( P. 221)
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? (P. 486)
●The parking brake indicator is on
Is the parking brake released? ( P. 233)
Depending on the situation, other types of warning buzzer may also sound.
( P. 485, 493)
The steering wheel cannot be turned after the engine is
stopped
The windows do not open or close by operating the power
window switches
The engine switch is tur ned off automatically
(vehicles with a smart key system)
A warning buzzer sounds during driving

597What to do if... (Troubleshooting)
●Is the electronic key left inside the vehicle?
Check the message on the multi-information display. (P. 493)
●Did anyone inside the vehicle open a door during setting the al arm?
The sensor detects it and the alarm sounds. ( P. 95)
To stop the alarm, turn the engine switch to ACC or ON, or start the engine.
●When a warning light turns on or a warning message is displayed , refer to
P. 485, 493.
●Stop the vehicle in a safe place and replace the flat tire with the spare tire.
( P. 506)
●Try the procedure for when the vehicle becomes stuck in mud, di rt, or
snow. ( P. 532)
A warning buzzer sounds w hen leaving the vehicle
(vehicles with a smart key system)
An alarm is activated and the horn sounds
A warning light turns on or a warning message or indicator
is displayed
When a problem has occurred
If you have a flat tire
The vehicle becomes stuck

598Alphabetical index
Alphabetical index
A/C .................................... 340, 347Air conditioning filter ............. 448
Automatic air conditioning system ......... ....................... 347
Manual air conditioning system ......... ....................... 340
ABS (Anti-lock Brake
System) .................................. 320 Function ................................ 320
Warning light ......................... 486
Air conditioning filter .............. 448
Air conditioning system ............................ 340, 347
Air conditioning filter ............. 448
Automatic air conditioning system ......... ....................... 347
Manual air conditioning system ......... ....................... 340
Airbags ....................................... 40
Airbag operating conditions .... 49
Airbag precautions for your child ......................... 44
Airbag warning light .............. 485
Correct driving posture ........... 32
Curtain shield airbag operating conditions ............. 49
Curtain shield airbag precautions ........................... 45
Front passenger occupant classification syst em............. 53
General airbag precautions .... 44
Locations of airbags................ 40 Modification and disposal
of airbags ............................. 47
Side airbag operating
conditions ............................. 49
Side airbag precautions .......... 45
Side and curtain shield airbags operating
conditions ............................. 49
Side and curtain shield airbags precautions .............. 45
SRS airbags ........................... 40
Alarm Alarm ...................................... 95
Warning buzzer ............ 485, 493
Anchor brackets ........................ 63
Antennas (smart key system) ............... 138
Anti-lock Brake System (ABS) ...................................... 320
Function ................................ 320
Warning light......................... 486
Armrest..................................... 383
Assist grips .............................. 384
Audio input
*
Audio remote control switches*
AUX port*
AUTO LSD system................... 318
Automatic High Beam ............. 239
Automatic light control
system.................................... 234
Automatic transmission
Automatic transmission ........ 225
If the shift lever cannot be shifted from P ..................... 229
TOW/HAUL switch................ 228
AUX port
*
Auxiliary boxes ........................ 373
A

599Alphabetical index
Back windowBack window ......................... 175
Power back window .............. 176
Back-up lights
Replacing light bulbs............. 468
Wattage ................................ 550
Battery ...................................... 422
If the vehicle battery is discharged .......................... 525
Preparing and checking
before winter....................... 331
Warning light ......................... 485
Blind Spot Monitor (BSM) ....... 305
Bluetooth
®*
Bottle holders .......................... 372
Brake
Fluid ...................................... 420
Parking brake........................ 233
Warning buzzer..................... 485
Warning light ......................... 485
Brake assist ............................. 320
Brake Override System ........... 185
Break-in tips ............................. 186
Brightness control Instrument panel light
control................................. 107
BSM (Blind Spot Monitor) ....... 305 Blind Spot Monitor
function ............................... 309
Rear Cross Traffic Alert function ............................... 312 Camper information ................ 588
Card holder .............................. 364
Care .................................. 400, 403
Aluminum wheels ................. 400
Exterior ................................. 400
Interior .................................. 403
Seat belts.............................. 404
Cargo capacity......................... 195
Cargo lamp Light switch ........................... 359
Replacing light bulbs ............ 470
Wattage ................................ 550
CD player
*
Certification label ............ 200, 541
Chains ...................................... 332
Child restraint system............... 59
Booster seats, definition ......... 60
Booster seats, installation....... 69
Convertible seats, definition ... 60
Convertible seats, installation ............................ 68
Front passenger occupant
classification syst em ............ 53
Infant seats, definition............. 60
Infant seats, installation .......... 67
Installing CRS with LATCH anchors ............ 65
Installing CRS with seat
belts...................................... 67
Installing CRS with top tether strap........ 70, 73
BC
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.