warning light TOYOTA YARIS HATCHBACK 2021 Repair Manual

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6-3. Do-it-yourself maintenance
determined and the inflation pres-
sures are not being displayed on the multi-information display, if the infla-tion pressure of a tire drops, the tire
pressure warning light will come on.
■If the tire pressure warning system is not initialized properly
●In the following situations, initialization may take longer than usual to be com-pleted or may not be possible. (Usu-
ally, the vehicle will need to be driven for approximately 10 to 30 minutes to complete initialization.) If initialization
is not complete after driving approxi- mately 30 minutes, continue driving for a while.
• If the vehicle is driven on an unpaved road, it may take longer to complete initialization.
• If the vehicle is backed up while per- forming initialization, data collected during initialization will be cleared and
it will take longer than normal to com- plete.• If the vehicle is driven in heavy traffic
or another situation where other vehi- cles are driven close by, it may take time for the system to recognize the
tire pressure warning valve and trans- mitters of your vehicle over those of other vehicles.
If initialization is not complete after driv-
ing for approximately 1 hour, park the
vehicle in a safe place for approximately
20 minutes and then drive the vehicle
again.
●In the following situations, initialization will not be started or was not com-
pleted properly and the system will not operate properly. Perform the initial-ization procedure again.
• If, when attempting to start initializa- tion, the tire pressure warning light does not blink 3 times.
• If, when the vehicle has been driven for about 20 minutes after performing initialization, the tire pressure warning
light blinks for approximately 1 minute and then illuminates.
●If initialization cannot be completed
after performing the above procedure,
contact any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
The tire pressure warning valve
and transmitter is equipped with a
unique ID code. When replacing a
tire pressure warning valve and
transmitter, it is necessary to regis-
ter the ID code.
The ID codes can be registered on
of the multi-information display.
1 Press / (vertical display)
or / (horizontal display)
of the meter control switch to
select .
2 Press / (vertical display)
or / (horizontal display)
to select “Vehicle Settings” and
then press .
WARNING
■When initializing the tire pres- sure warning system
Do not initialize the tire pressure
warning system without first adjusting the tire inflation pressure to the speci-fied level. Otherwise, the tire pressure
warning light may not come on even if the tire inflation pressure is low, or it may come on when the tire inflation
pressure is actually normal.
Registering ID codes

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6-3. Do-it-yourself maintenance
Maintenance and care
3Press / to select “TPWS
setting” and then press .
4Press / to select “Identi-
fying Each Wheel & Position”.
Then press and hold until
the tire pressure warning light
blinks slowly 3 times.
Then a message will be displayed on
the multi-information display.
When registration is being performed,
the tire pressure warning light will blink
for approximately 1 minute then illumi-
nate and “--” will be displayed for the
inflation pressure of each tire on the
multi-information display.
5Drive straight (with occasional
left and right turns) at approxi-
mately 40 km/h (25 mph) or
more for approximately 10 to 30
minutes.
Registration is complete when the tire
pressure warning light turns off and the
inflation pressure of each tire is dis-
played on the multi-information display.
Registration may take longer than
approximately 1 hour in certain situa-
tions, such as when the vehicle is
stopped for a long time at traffic lights,
etc. (→P.337)
After registering the ID codes, make
sure to initialize the tire pressure warn-ing system. (→P.335)
■When registering ID codes
●Before performing ID code registra-
tion, make sure that no wheels with
tire pressure warning valve and trans-
mitters installed are near the vehicle.
●Make sure to initialize the tire pres-
sure warning system after registering
the ID codes. If the system is initial-
ized before registering the ID codes,
the initialized values will be invalid.
●As the tires will be warm when regis-
tration is completed, make sure to
allow the tires to cool before perform-
ing initialization.
■Canceling ID code registration
●To cancel ID code registration after it
has been started, turn the engine
switch off before driving the vehicle.
If the vehicle is driven after ID code
registration is started, to cancel regis-
tration, perform the ID code registra-
tion start procedure again and turn the
engine switch off before driving.
●If ID code registration has been can-
celed, the tire pressure warning light
will blink for approximately 1 minute
when the engine switch is turned to
ON mode and then illuminate. The tire
pressure warning system will be oper-
ational when the tire pressure warning
light turns off.
●If the warning light does not turn off
even after several minutes have
elapsed, ID code registration may not
have been canceled correctly. To can-
cel registration, perform the ID code
registration start procedure again and
then turn the engine switch off before
driving.
■If ID codes are not registered prop-
erly
●In the following situations, ID code
registration may take longer than
usual to be completed or may not be
possible. (Usually, the vehicle will
need to be driven for approximately

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6-3. Do-it-yourself maintenance
10 to 30 minutes to complete ID code
registration.)
If ID code registration is not complete
after driving for approximately 30 min-
utes, continue driving for a while.
• If the vehicle is driven on an unpaved
road, it may take longer than normal
to complete registration.
• If the vehicle is backed up while per-
forming registration, data collected
during registration will be cleared, and
it will take longer than normal to com-
plete.
• If the vehicle is driven in heavy traffic
or another situation where other vehi-
cles are driven close by, it may take
time for the system to recognize the
tire pressure warning valve and trans-
mitters of your vehicle over those of
other vehicles.
• If a wheel with a tire pressure warning
valve and transmitter installed is
inside or near the vehicle, registration
of the ID codes for the installed
wheels may not be possible.
If ID registration is not complete after
driving for approximately 1 hour, park
the vehicle in a safe place for approxi-
mately 20 minutes and then perform the
ID code registration procedure again.
●In the following situations, ID code
registration will not be started or was
not completed properly and the sys-
tem will not operate properly. Perform
the ID code registration procedure
again.
• If, when attempting to start ID code
registration, the tire pressure warning
light does not blink slowly 3 times.
• If, when the vehicle has been driven
for about 10 minutes after performing
ID code registration, the tire pressure
warning light blinks for approximately
1 minute and then illuminates.
●If ID code registration cannot be com-
pleted after performing the above pro-
cedure, contact any authorized Toyota
retailer or Toyota authorized repairer,
or any reliable repairer.
Your vehicle is equipped with tire
pressure warning system with the
function to have ID codes regis-
tered for a second wheel set, for
example a winter set, by any autho-
rized Toyota retailer or Toyota
authorized repairer, or any reliable
repairer.
After registration of a second wheel
set, either of these two wheel sets
can be selected for usage with the
tire pressure warning system.
■Operating conditions for the
function
zThis function will perform the
change of wheel set only if a sec-
ond wheel set has been regis-
tered. If no second wheel set has
been registered, no change will
be made when selecting this
function in the menu.
zOnly a change between both
registered wheel set is possible,
mixing between these wheel sets
is not supported.
■How to change between wheel
sets
1Have the vehicle fitted with the
preferred wheel set.
2Press / (vertical display)
or / (horizontal display)
of the meter control switch to
select .
Selecting wheel set

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6-3. Do-it-yourself maintenance
Maintenance and care
3Press / (vertical display)
or / (horizontal display)
to select “Vehicle Settings” and
then press .
4Press / to select “TPWS
setting” and then press .
5Press / to select “Identi-
fying Each Wheel & Position”.
Then press and hold until
the tire pressure warning light
blinks slowly 3 times. Afterward,
turns on after flashing for 1 min-
ute.
After 2 minutes, registration of a second
wheel set is being performed. The tire
pressure warning light will turn off and
“--” will be displayed for the inflation
pressure of each tire on the multi-infor-
mation display.
6Initialize the tire pressure warn-
ing system. (→P.334)
If the tire inflation pressure settings for
the installed tire changes, initialization
operations are required, but if the same
tire inflation pressure, initialization is
not required.
7Drive straight (with occasional
left and right turns) at approxi-
mately 40 km/h (25 mph) or
more for approximately 10 to 30
minutes.
Registration of a second wheel set is
complete when the tire pressure warn-
ing light turns off and the inflation pres-
sure of each tire is displayed on the
multi-information display.

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6-3. Do-it-yourself maintenance
Type B
Normal fuse
Blown fuse
Type C
Normal fuse
Blown fuse
Type D
Normal fuse
Blown fuse
Typ e E
Normal fuse
Blown fuse
■After a fuse is replaced
●When installing the lid, make sure that the tab is installed securely.
●If the lights do not turn on even after the fuse has been replaced, a bulb
may need replacement. ( →P.351)
●If the replaced fuse blows again, have
the vehicle inspected by any autho- rized Toyota retailer or Toyota autho-rized repairer, or any reliable repairer.
■If there is an overload in a circuit
The fuses are designed to blow, protect- ing the wiring harness from damage.
■When replacing light bulbs
Toyota recommends that you use genu-
ine Toyota products designed for this vehicle.Because certain bulbs are connected to
circuits designed to prevent overload, non-genuine parts of parts not designed for this vehicle may be unusable.
WARNING
■To prevent system breakdowns and vehicle fire
Observe the following precautions.
Failure to do so may cause damage to the vehicle, and possibly a fire or
injury.

351
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6-3. Do-it-yourself maintenance
Maintenance and care
Check the wattage of the light bulb
to be replaced. ( →P.419)
Front
Front position lights (bulb type)
Front turn signal lights (bulb
type)
Front fog lights (bulb type)
Headlights (bulb type)
WARNING
●Never use a fuse of a higher amperage rating than that indi-
cated, or use any other object in place of a fuse.
●Always use a genuine Toyota fuse or equivalent.Never replace a fuse with a wire,
even as a temporary fix.
●Do not modify the fuses or fuse
boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical overload
determined and repaired by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer as soon as possible.
■When installing the fuse box
cover (Engine compartment: type A and type B fuse boxes)
Press the fuse box cover, when
installing, after aligning all of the claw positions. Otherwise, the claws may
be damaged.
Light bulbs
You may replace the following
bulbs by yourself. The diffi-
culty level of replacement var-
ies depending on the bulb. As
there is a danger that compo-
nents may be damaged, we
recommend that replacement
is carried out by any autho-
rized Toyota retailer or Toyota
authorized repairer, or any reli-
able repairer.
Preparing for light bulb
replacement
Bulb locations

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6-3. Do-it-yourself maintenance
2Push the lens into place.
After installation, confirm that the lens is
properly installed by gently pulling it.
Fitting portion
WARNING
■Replacing light bulbs
●Turn off the lights. Do not attempt to
replace the bulb immediately after turning off the lights. The bulbs become very hot and may cause
burns.
●Do not touch the glass portion of
the light bulb with bare hands. When it is unavoidable to hold the glass portion, use and hold with a
clean dry cloth to avoid getting moisture and oils on the bulb. Also, if the bulb is scratched or dropped,
it may blow out or crack.
●Fully install light bulbs and any
parts used to secure them. Failure to do so may result in heat damage, fire, or water entering the light unit.
This may damage the lights or cause condensation to build up on the lens.
■To prevent damage or fire
Make sure bulbs are fully seated and
locked.

7
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7
When trouble arises
When trouble arises
7-1. Essential information
Emergency flashers .......... 360
If your vehicle has to be
stopped in an emergency 360
If the vehicle is trapped in rising
water............................... 361
7-2. Steps to take in an emer-
gency
If your vehicle needs to be
towed .............................. 363
If you think something is wrong
....................................... 366
Fuel pump shut off system 367
If a warning light turns on or a
warning buzzer sounds... 368
If a warning message is dis-
played ............................. 377
If you have a flat tire (vehicles
with an emergency tire punc-
ture repair kit) ................. 379
If you have a flat tire (vehicles
with a spare tire) ............. 389
If the engine will not start .. 397
If you lose your keys ......... 399
If the electronic key does not
operate properly (vehicles
with a smart entry & start sys-
tem) ................................ 399
If the vehicle battery is dis-
charged .......................... 401
If your vehicle overheats... 405
If the vehicle becomes stuck
....................................... 408

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7-2. Steps to take in an emergency
■Brake system warning light (warning buzzer)
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
■Charging system warning light*
*: This light illuminates on the multi-information display.
If a warning light turns on or a warning 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 malfunction in the system.
However, if this continues to occur, have the vehicle inspected by
any authorized Toyota retailer or Toyota authorized repairer, or any
reliable repairer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
Indicates that:
z The brake fluid level is low; or
z The brake system is malfunctioning
→ Immediately stop the vehicle in a safe place and contact
any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer. Continuing to drive the
vehicle may be dangerous.
Warning lightDetails/Actions
Indicates that the engine coolant temperature is excessively high
→ Immediately stop the vehicle in a safe place.
Handling method ( →P.405)
Warning lightDetails/Actions
Indicates a malfunction in the vehicle’s charging system
→ Immediately stop the vehicle in a safe place and contact
any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.

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7-2. Steps to take in an emergency
When trouble arises
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
■Malfunction indicator lamp (warning buzzer)
■SRS warning light (warning buzzer)
■ABS warning light
Warning lightDetails/Actions
Indicates that the engine oil pressure is excessively low
→ Immediately stop the vehicle in a safe place and contact
any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
Warning lightDetails/Actions
Indicates a malfunction in:
z The electronic engine control system;
z The electronic throttle control system; or
z The electronic Multidrive (if equipped) control system
→ Immediately stop the vehicle in a safe place and contact
any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
Warning lightDetails/Actions
Indicates a malfunction in:
z The SRS airbag system; or
z The seat belt pretensioner system
→ Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
Warning lightDetails/Actions
Indicates a malfunction in:
z The ABS; or
z The brake assist system
→ Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.