warning light TOYOTA YARIS HATCHBACK 2021 Service Manual

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4-5. Using the driving support systems
■Enabling/disabling the pre-col-
lision system
The pre-collision system can be
enabled/disabled on ( →P.422)
of the multi-information display.
The system is automatically enabled
each time the engine switch is turned to
ON.
If the system is disabled, the PCS
warning light will turn on and a
message will be displayed on the
multi-information display.
■Changing the pre-collision
warning timing
The pre-collision warning timing
can be changed on ( →P.422) of
the multi-information display.
The warning timing setting is retained
when the engine switch is turned off.
However, if the pre-collision system is
disabled and re-enabled, the operation
timing will return to the default setting
(middle).
WARNING
●When transporting the vehicle via truck, boat, train or similar means of
transportation
●When the vehicle is raised on a lift
with the engine running and the tires are allowed to rotate freely
●When inspecting the vehicle using a drum tester such as a chassis dynamometer or speedometer tes-
ter, or when using an on vehicle wheel balancer
●When a strong impact is applied to the front bumper or front grille, due to an accident or other reasons
●If the vehicle cannot be driven in a stable manner, such as when the
vehicle has been in an accident or is malfunctioning
●When the vehicle is driven in a sporty manner or off-road
●When the tires are not properly inflated
●When the tires are very worn
●When tires of a size other than
specified are installed
●When tire chains are installed
●When a compact spare tire or an emergency tire puncture repair kit is
used
●If equipment (snow plow, etc.) that
may obstruct the radar sensor or front camera is temporarily installed to the vehicle
Changing settings of the
pre-collision system

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4-5. Using the driving support systems
Driving
• If the braking functions cannot operate
to their full extent, such as when the
brake parts are extremely cold,
extremely hot, or wet
• If the vehicle is not properly main-
tained (brakes or tires are excessively
worn, improper tire inflation pressure,
etc.)
• When the vehicle is being driven on a
gravel road or other slippery surface
• When the road surface has deep
wheel tracks
• When driving on a hill road
• When driving on a road that has
inclines to the left or right
■If VSC is disabled
●If VSC is disabled (→P.270), the pre-
collision brake assist and pre-collision
braking functions are also disabled.
●The PCS warning light will turn on and
“VSC Turned OFF Pre-Collision Brake
System Unavailable” will be displayed
on the multi-information display.
*: If equipped
LTA (Lane Tracing
Assist)
*
When driving on highways and
freeways with white (yellow)
lane lines, this function alerts
the driver when the vehicle
might depart from its lane or
course
* and provides assis-
tance by operating the steering
wheel to keep the vehicle in its
lane or course
*. Furthermore,
the system provides steering
assistance when dynamic
radar cruise control is operat-
ing to keep the vehicle in its
lane.
The LTA system recognizes
white (yellow) lane lines or a
course
* using the front cam-
era. Additionally, it detects pre-
ceding vehicles using the front
camera and radar.
*: Boundary between asphalt and the
side of the road, such as grass,
soil, or a curb

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4-5. Using the driving support systems
WARNING
■Before using LTA system
●Do not rely solely upon the LTA sys-
tem. The LTA system does not automatically drive the vehicle or reduce the amount of attention that
must be paid to the area in front of the vehicle. The driver must always assume full responsibility for driving
safely by paying careful attention to the surrounding conditions and operating the steering wheel to cor-
rect the path of the vehicle. Also, the driver must take adequate breaks when fatigued, such as from
driving for a long period of time.
●Failure to perform appropriate driv-
ing operations and pay careful attention may lead to an accident, resulting in death or serious injury.
●When not using the LTA system, use the LTA switch to turn the sys-
tem off.
■Situations unsuitable for LTA
system
In the following situations, use the LTA switch to turn the system off. Fail-
ure to do so may lead to an accident, resulting in death or serious injury.
●Vehicle is driven on a road surface which is slippery due to rainy weather, fallen snow, freezing, etc.
●Vehicle is driven on a snow-cov-ered road.
●White (yellow) lines are difficult to see due to rain, snow, fog, dust,
etc.
●Vehicle is driven in a temporary
lane or restricted lane due to con- struction work.
●Vehicle is driven in a construction zone.
●A spare tire, tire chains, etc., are equipped.
●When the tires have been exces-sively worn, or when the tire infla-tion pressure is low.
●When tires of a size other than specified are installed.
●Vehicle is driven in traffic lanes other than that highways and free-
ways.
●When your vehicle is towing a
trailer or during emergency towing
■Preventing LTA system malfunc-
tions and operations performed by mistake
●Do not modify the headlights or
place stickers, etc., on the surface of the lights.
●Do not modify the suspension, etc. If the suspension, etc., needs to be replaced, contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer.
●Do not install or place anything on the hood or grille. Also, do not install a grille guard (bull bars, kan-
garoo bar, etc.).
●If your windshield needs repairs,
contact any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
■Conditions in which functions may not operate properly
In the following situations, the func- tions may not operate properly and the vehicle may depart from its lane.
Drive safely by always paying careful attention to your surroundings and operate the steering wheel to correct
the path of the vehicle without relying solely on the functions.

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4-5. Using the driving support systems
■Lane departure alert function
When the system determines that
the vehicle might depart from its
lane or course*, a warning is dis-
played on the multi-information dis-
play, and either a warning buzzer
will sound or the steering wheel will
vibrate to alert the driver.
When the warning buzzer sounds or
the steering wheel vibrates, check the
area around your vehicle and carefully
WARNING
●The vehicle is driven in an area without white (yellow) lines, such as
in front of a tollgate or checkpoint, or at an intersection, etc.
●The white (yellow) lines are cracked, “Raised pavement marker” or stones are present.
●The white (yellow) lines cannot be seen or are difficult to see due to
sand, etc.
●The vehicle is driven on a road sur-
face that is wet due to rain, pud- dles, etc.
●The traffic lines are yellow (which may be more difficult to recognize than lines that are white).
●The white (yellow) lines cross over a curb, etc.
●The vehicle is driven on a bright surface, such as concrete.
●If the edge of the road is not clear or straight.
●The vehicle is driven on a surface that is bright due to reflected light,
etc.
●The vehicle is driven in an area
where the brightness changes sud- denly, such as at the entrances and exits of tunnels, etc.
●Light from the headlights of an oncoming vehicle, the sun, etc.,
enters the camera.
●The vehicle is driven on a slope.
●The vehicle is driven on a road which tilts left or right, or a winding
road.
●The vehicle is driven on an
unpaved or rough road.
●The traffic lane is excessively nar-
row or wide.
●The vehicle is extremely tilted due to carrying heavy luggage or having improper tire pressure.
●The distance to the preceding vehi-cle is extremely short.
●The vehicle is moving up and down a large amount due to road condi-
tions during driving (poor roads or road seams).
●When driving in a tunnel or at night with the headlights off or when a headlight is dim due to its lens
being dirty or it being misaligned.
●The vehicle is struck by a cross-
wind.
●The vehicle is affected by wind from
a vehicle driven in a nearby lane.
●The vehicle has just changed lanes
or crossed an intersection.
●Tires which differ by structure, man-
ufacturer, brand or tread pattern are used.
●Snow tires, etc., are equipped.
●The vehicle is being driven at
extremely high speeds.
Functions included in LTA
system

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4-5. Using the driving support systems
This mode employs a radar to detect the presence of vehicles up to approx-
imately 100 m (328 ft.) ahead, determines the current vehicle-to-vehicle fol-
lowing distance, and operates to maintain a suitable following distance from
the vehicle ahead. The desired vehicle-to-vehicle distance can also be set
by operating the vehicle-to-vehicle distance switch.
When driving on downhill slopes, the vehicle-to-vehicle distance may become
shorter.
Example of constant speed cruising
When there are no vehicles ahead
The vehicle travels at the speed set by the driver.
Example of deceleration cruising and follow-up cruising
When a preceding vehicle driving slower than the set speed appears
When a vehicle is detected running ahead of you, the system automatically deceler-
ates your vehicle. When a greater reduction in vehicle speed is necessary, the sys-
tem applies the brakes (the stop lights will come on at this time). The system will
respond to changes in the speed of the vehicle ahead in order to maintain the vehi-
cle-to-vehicle distance set by the driver. Approach warning warns you when the sys-
tem cannot decelerate sufficiently to prevent your vehicle from closing in on the
vehicle ahead.
When the turn signal lever is operated and your vehicle moves to an overtaking lane
while driving at 80 km/h (50 mph) or more, the vehicle will accelerate to help to over-
take a passing vehicle.
The system’s identification of what is an overtaking lane may be determined solely
based on the location of the steering wheel in the vehicle (left side driver position
Driving in vehicle-to-vehicle distance control mode

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4-5. Using the driving support systems
WARNING
■When the Stop & Start system is operating
Make sure to disable the Stop & Start system while the vehicle is in a poorly ventilated area.
If not disabled, the engine may be automatically restarted unexpectedly, causing exhaust gases to collect and
enter the vehicle, possibly resulting in death or a serious health hazard.
●Do not leave the vehicle while the
engine is stopped by the Stop & Start system (while the Stop & Start indicator is on). An accident may
occur due to the automatic engine start function.
●Depress the brake pedal and apply the parking brake when necessary while the engine is stopped by the
Stop & Start system (while the Stop & Start indicator is on).
NOTICE
■To ensure the system operates correctly
If any of the following situations occur, the Stop & Start system may not oper-ate correctly. Have your vehicle
inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
●While the driver’s seat belt is fas-tened, the driver’s and front pas-senger’s seat belt reminder light
flashes.
●Even though the driver’s seat belt is
not fastened, the driver’s and front passenger’s seat belt reminder light does not illuminate.
●Even though the driver’s door is closed, the open door warning light
is illuminated or the interior light is illuminated when the interior light switch is in the door position.
●Even though the driver’s door is open, the open door warning light does not illuminate or the interior
light does not illuminate when the interior light switch is in the door position.
■If the engine stalls (vehicles with a manual transmission)
If the Stop & Start system is enabled and the clutch pedal is depressed quickly, the engine may restart.

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4-5. Using the driving support systems
Driving
*: If equipped
Meter control switches
Turning the Blind Spot Monitor on/off.
Outside rear view mirror indica-
tors
When a vehicle is detected in a blind
spot of the outside rear view mirrors or
approaching rapidly from behind into a
blind spot, the outside rear view mirror
indicator on the detected side will illumi-
nate. If the turn signal lever is operated
toward the detected side, the outside
rear view mirror indicator flashes.
BSM OFF indicator
Illuminates when the Blind Spot Monitor
is disabled.
■Outside rear view mirror indicator visibility
In strong sunlight, the outside rear view mirror indicator may be difficult to see.
■When “Blind Spot Monitor Unavail-able See Owner’s Manual” is
shown on the multi-information display
Ice, snow, mud, etc., may be attached to
the rear bumper around the sensors. ( →P.238) The system should return to normal operation after removing the ice,
snow, mud, etc., from the rear bumper. Additionally, the sensors may not oper-ate normally when driving in extremely
BSM (Blind Spot Moni-
tor)*
The Blind Spot Monitor is a
system that uses rear side
radar sensors installed on the
inner side of the rear bumper
on the left and right side to
assist the driver in confirming
safety when changing lanes.
WARNING
■Cautions regarding the use of
the system
The driver is solely responsible for safe driving. Always drive safely, tak-
ing care to observe your surround- ings.
The Blind Spot Monitor is a supple-
mentary function which alerts the driver that a vehicle is in a blind spot of the outside rear view mirrors or is
approaching rapidly from behind into a blind spot. Do not overly rely on the
Blind Spot Monitor. As the function cannot judge if it is safe to change lanes, over reliance could lead to an
accident resulting in death or serious injury.
As the system may not function cor-
rectly under certain conditions, the driver’s own visual confirmation of safety is necessary.
System components

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4-5. Using the driving support systems
Driving
Use the meter control switches to
turn on/off the function.
1 Press / (vertical display)
or / (horizontal display)
of the meter control switch to
select .
2 Press / (vertical display)
or / (horizontal display)
of the meter control switch to
select and then press .
■Vehicles that can be detected by the Blind Spot Monitor
The Blind Spot Monitor uses rear side radar sensors to detect the following
vehicles traveling in adjacent lanes and advises the driver of the presence
of such vehicles via the indicators on the outside rear view mirrors.
WARNING
●Do not subject a sensor or its sur- rounding area on the rear bumper
to a strong impact. If a sensor is moved even slightly off position, the system may mal-
function and vehicles may not be detected correctly.In the following situations, have
your vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
• A sensor or its surrounding area is subject to a strong impact.
• If the surrounding area of a sensor is scratched or dented, or part of them has become disconnected.
●Do not disassemble the sensor.
●Do not modify the sensor or sur-rounding area on the rear bumper.
●If a sensor or the rear bumper needs to be removed/installed or replaced, contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer.
●Do not paint the rear bumper any color other than an official Toyota color.
Turning the Blind Spot Moni-
tor on/off
Blind Spot Monitor operation

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4-5. Using the driving support systems
Driving
tance to the object.
Front corner sensor detection
Front center sensor detection
Rear corner sensor detection
Rear center sensor detection
Use the meter control switches to
enable/disable the Toyota parking
assist-sensor. ( →P.94, 100)
1 Press / (vertical display)
or / (horizontal display)
of the meter control switch to
select .
2 Press / (vertical display)
or / (horizontal display)
of the meter control switch to
select and then press .
When the Toyota parking assist-
sensor function is disabled, the
Toyota parking assist-sensor OFF
indicator ( →P.84) illuminates.
To re-enable the system when it
was disabled, select on the
multi-information display, select
and then on. If disabled using this
method, the system will not be re-
enabled by turning the engine
switch off and then to ON.
Turning Toyota parking
assist-sensor on/off
WARNING
■When using the Toyota parking
assist-sensor
Observe the following precautions. Failing to do so may result in the vehi-
cle being unable to be driven safely and possibly cause an accident.
●Do not use the sensor at speeds in excess of 10 km/h (6 mph).
●The sensors’ detection areas and reaction times are limited. When moving forward or reversing, check
the areas surrounding the vehicle (especially the sides of the vehicle) for safety, and drive slowly, using
the brake to control the vehicle’s speed.
●Do not install accessories within the sensors’ detection areas.
●The area directly under the bum-pers is not detected.Thin posts or objects lower than the
sensor may not be detected when approached, even if they have been detected before.
■When to disable the function
In the following situations, disable the
function as it may operate even though there is no possibility of a colli-sion.
●The vehicle is equipped with a fender pole, wireless antenna or fog
lights.

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4-5. Using the driving support systems
■Turning off both TRC, VSC and
Trailer Sway Control systems
To turn the TRC, VSC and Trailer Sway
Control systems off, press and hold
for more than 3 seconds while the vehi-
cle is stopped.
The VSC OFF indicator light will come
on and the “Traction Control Turned
OFF” will be shown on the multi-infor-
mation display.
*
Press again to turn the system
back on.
*: On vehicles with PCS (Pre-Collision
System), PCS will also be disabled
(only Pre-Collision warning is avail-
able). The PCS warning light will
come on and a message will be dis-
played on the multi-information dis-
play. (→P.203)
■When the message is displayed on
the multi-information display show-
ing that TRC has been disabled
even if has not been pressed
TRC is temporary deactivated. If the
information continues to show, contact
any authorized Toyota retailer or Toyota
authorized repairer, or any reliable
repairer.
■Operating conditions of hill-start
assist control
When the following conditions are met,
the hill-start assist control will operate:
●Vehicles with a Multidrive: The shift
lever is in a position other than P or N
(when starting off forward/backward
on an upward incline).
●Vehicles with a manual transmission:
The shift lever is in a position other
than R when starting off forward on an
upward incline, or the shift lever is in
R when starting off backward on an
upward incline.
●The vehicle is stopped
●The accelerator pedal is not
depressed
●The parking brake is not engaged
■Automatic system cancelation of
hill-start assist control
The hill-start assist control will turn off in
any of the following situations:
●Vehicles with a Multidrive: The shift
lever is shifted to P or N.
●Vehicles with a manual transmission:
The shift lever is shifted to R when
starting off forward on an upward
incline, or the shift lever is shifted to
other than R when starting off back-
ward on an upward incline.
●The accelerator pedal is depressed
●The parking brake is engaged
●2 seconds at maximum elapsed after
the brake pedal is released
■Sounds and vibrations caused by
the ABS, brake assist, VSC, Trailer
Sway Control, TRC and hill-start
assist control systems
●A sound may be heard from the
engine compartment when the brake
pedal is depressed repeatedly, when
the engine is started or just after the
vehicle begins to move. This sound
does not indicate that a malfunction
has occurred in any of these systems.
●Any of the following conditions may
occur when the above systems are
operating. None of these indicates
that a malfunction has occurred.
• Vibrations may be felt through the
vehicle body and steering.
• A motor sound may be heard also
after the vehicle comes to a stop.
• The brake pedal may pulsate slightly
after the ABS is activated.
• The brake pedal may move down
slightly after the ABS is activated.
■Active Cornering Assist operation
sounds and vibrations
When the Active Cornering Assist is
operated, operation sounds and vibra-