2021 TOYOTA 4RUNNER warning light

4847-2. Steps to take in an emergency
4RUNNER (U)
Master warning light
The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the multi-
information display.
Multi-information display
Handling method
Follow the instructions of the mes-
sage on the multi-information dis-
play.
If any of the warning messages are shown again after the following
actions have been performed, contact your Toyota dealer.
If a warning message is displayed
The multi-information display shows warnings of system mal-
functions, incorrectly performed operations, and messages that
indicate a need for maintena nce. When a message is shown,
perform the correction procedur e appropriate to the message.
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4857-2. Steps to take in an emergency
7
When trouble arises
4RUNNER (U)
The warning lights and warning buzzers operate as follows depending
on the content of the message. If a message indicates the need for
inspection by a dealer, have the vehicle inspected by your Toyota
dealer immediately.
The operation of the warning lights and warning buzzers may dif fer
from those stated. in this case, perform the correction procedu re
according to the displayed message.
*: A buzzer sounds the first time a message is shown on the multi -informa-
tion display.
Messages and warnings
System
warning lightWarning
buzzer
*Warning
Comes on Comes on Sounds Indicates an important situation, such
as when a system related to driving is
malfunctioning or that danger may
result if the correction procedure is not
performed
Comes onSounds
Comes on
or flashesSounds
Indicates an important situation, such
as when the systems shown on the
multi-information display may be mal-
functioning
FlashesSounds
Indicates a situation, such as when
damage to the vehicle or danger may
result
Comes onDoes not sound
Indicates a condition, such as mal-
function of electrical components, their
condition, or indicates the need for
maintenance
FlashesDoes not sound
Indicates a situation, such as when an
operation has been performed incor-
rectly, or indicates how to perform an
operation correctly

4867-2. Steps to take in an emergency
4RUNNER (U)
■Warning messages
The warning messages explained below may differ from the actual messages
according to operation conditions and vehicle specifications.
■ System warning lights
The master warning light does not come on or flash in the following cases.
Instead, a separate system warning light will come on along wit h a message
or image shown on the multi-information display.
● Malfunction in the ABS
The ABS warning light comes on. ( P. 475)
● Indicates that the PCS (Pre-Collision System) is not currently functional
The PCS warning light comes on or flashes. ( P. 478)
● Malfunction in the tire pressure warning system
The tire pressure warning light comes on. ( P. 478)
■ If a message instructing to refer to the Owner’s Manual is disp layed
● If the following message is shown, there may be a malfunction.
Immediately stop the vehicle in a safe place and contact your T oyota dealer.
Continuing to drive the vehicle may be dangerous.
• “Braking Power Low Stop in a Safe Place See Owner’s Manual”
• “Oil Pressure Low Stop in a Safe Place See Owner’s Manual”
● If “Engine Coolant Temp High Stop in a Safe Place See Owner’s M anual” is
displayed, follow the instructions accordingly. ( P. 514)
● If “Front Camera Unavailable See Owner’s Manual” is displayed, follow the
instructions accordingly. ( P. 251, 484)
● If the following message is shown, there may be a malfunction.
Immediately have the vehicle inspected by your Toyota dealer.
• “Smart Key System Malfunction See Owner’s Manual”
■ If “High transmission fluid temperature” is shown, it indicates that the
automatic transmission fluid temperature is too high.
Immediately stop the vehicle in a safe place, shift the shift l ever to P and wait
until the warning message and light go off. If the warning message and light
go off, you may start the vehicle again. If the warning message and light do
not go off, contact your Toyota dealer.

5027-2. Steps to take in an emergency
4RUNNER (U)
Confirm that the tire is not loose
after tightening:Push and pull the tire
Try rotating
Vishually check to ensure the tire
is not hung on su rrounding parts.
If looseness or misassembly
exists, repeat step and step
.
Repeat step any time the tire is lowered or disturbed.
Stow the tools and jack securely.
■After completing the tire change
The tire pressure warni ng system must be reset. ( P. 425)
■When using the spare tire (veh icles without P245/60R20 tires)
As the spare tire is not equipped with a tire pressure warning valve and
transmitter, low inflation pre ssure of the spare tire will not be indicated by
the tire pressure warning system. Also, if you replace the spar e tire after
the tire pressure wa rning light comes on, the light remains on.
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5137-2. Steps to take in an emergency
7
When trouble arises
4RUNNER (U)
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 other end of the jumper cable connected to the “+” termi-
nal to come into contact with any other parts or metal surfaces in the area,
such as brackets or unpainted metal.
● Do not allow the + and - clamps of the jumper cables to come in to 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.
NOTICE
■When handling jumper cables
When connecting the jumper cables, ensure that they do not beco me entan-
gled in the cooling fans or engine drive belt.

577What to do if... (Troubleshooting)
4RUNNER (U)
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts?
(P. 477)
●The brake system warning light is on
Is the parking brake released? ( P. 224)
●The open door warning indicator is on
Are all the doors closed? (P. 110, 131)
Depending on the situation, other types of warning buzzer may a lso sound.
( P. 474, 484)

●Did anyone inside the vehicle open a door during setting the al arm?
The sensor detects it and the alarm sounds. ( P. 79)
To stop the alarm, turn the engine switch to IGNITION ON mode ( vehicles
with a smart key system) or start the engine.
●Is the electronic key left inside the vehicle?
Check the message on the multi-information display.
●When a warning light turns on, refer to P. 474.
●When a warning light turns on or a warning message or indicator is dis-
played, refer to P. 474, 484.
A warning buzzer sounds during driving
An alarm is activated and the horn sounds
A warning buzzer sounds w hen leaving the vehicle
(vehicles with a smart key system)
A warning light turns on or a warning message is displayed

579
4RUNNER (U)
Alphabetical index
Alphabetical index
A/C .................................... 340, 347Air conditioning filter ............. 441
ABS (Anti-lock Brake System)...... 320
Function ................................ 320
Warning light ......................... 475
Active head restraints ............. 137
Active traction control ............ 300
Air conditioning filter .............. 441
Air conditioning
system ............................ 340, 347 Air conditioning filter ............. 441
Airbags ....................................... 35
Airbag operating conditions .... 42
Airbag precautions for your child ......................... 37
Airbag warning light .............. 475
Correct driving posture ........... 28
Curtain shield airbag operating conditions ............. 42
Curtain shield airbag precautions ........................... 39
Front passenger occupant classification syst em............. 46
General airbag precautions .... 37
Locations of airbags................ 35
Modification and disposal of airbags.............................. 41
Side airbag operating
conditions ............................. 42
Side airbag precautions .......... 37
Side and curtain shield airbags operating conditions ............. 42
Side and curtain shield airbags precautions .............. 37
SRS airbags............................ 35 Alarm .......................................... 79
Alarm ...................................... 79
Warning buzzer .................... 474
Anchor brackets ........................ 57
Antennas (smart key system) ............... 118
Anti-lock Brake System (ABS) ...................................... 320
Function ................................ 320
Warning light......................... 475
Armrest..................................... 383
Assist grip ................................ 383
Audio system
*
AUTO LSD system................... 302
Automatic air conditioning
system.................................... 347
Automatic High Beam ............. 230
Automatic light control
system.................................... 225
Automatic running boards ..... 128
Automatic transmission ......... 218
If the shift lever cannot be shifted from P .... 221
S mode ................................. 219
AUX port
*
Auxiliary boxes ........................ 364
A
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.

580Alphabetical index
4RUNNER (U)
Back doorBack door.............................. 131
Back window ......................... 166
Smart key system ................. 118
Wireless remote control ........ 110
Back window ............................ 166
Back-up lights Replacing light bulbs............. 457
Wattage ................................ 529
Battery ...................................... 417
Battery checking ................... 417
If the vehicle battery is discharged ...................... 510
Preparing and checking before winter....................... 329
Warning light ......................... 474
Bottle holders .......................... 366
Brake Fluid ...................................... 414
Parking brake........................ 224
Warning light ......................... 474
Brake assist ............................. 320
Brake override system ............ 177
Break-in tips ............................. 178
Brightness control Instrument panel light
control................................... 89 Care .................................. 392, 395
Exterior ................................. 392
Interior .................................. 395
Seat belts.............................. 396
Wheels and wheel ornaments .......................... 393
Cargo capacity......................... 191
Cargo hooks ............................ 367
Cargo net hooks ...................... 368
Center differential lock ........... 296
Chains ...................................... 331
Child restraint system............... 53 Booster seats, definition ......... 54
Booster seats, installation....... 65
Convertible seats, definition ... 54
Convertible seats,
installation ............................ 62
Front passenger occupant classification syst em ............ 46
Infant seats, definition............. 54
Infant seats, installation .......... 62
Installing CRS with LATCH anchors ............ 59
Installing CRS with seat belts...................................... 62
Installing CRS
with top tether strap.............. 66
BC