Toyota Corolla (2020 year). Owner's manual - part 12

182

4-5. Using the driving support systems

WARNING

■

To avoid malfunction of the 

front camera

Observe the following precau-

tions.

Otherwise, the front camera may 

not operate properly, possibly 

leading to an accident resulting in 

death or serious injury.

●

Keep the windshield clean at all 

times.

• If the windshield is dirty or cov-

ered with an oily film, water 

droplets, snow, etc., clean the 

windshield.

• If a glass coating agent is 

applied to the windshield, it will 

still be necessary to use the 

windshield wipers to remove 

water droplets, etc. from the 

area of the windshield in front of 

the front camera.

• If the inner side of the wind-

shield where the front camera is 

installed is dirty, contact your 

Toyota dealer.

●

Do not attach objects, such as 

stickers, transparent stickers, 

etc., to the outer side of the 

windshield in front of the front 

camera (shaded area in the 

illustration).

From the top of the windshield 
to approximately 0.4 in. (1 cm) 
below the bottom of the front 
camera
Approximately 7.9 in. (20 cm) 
(Approximately 4.0 in. [10 cm] 
to the right and left from the 
center of the front camera)

●

If the part of the windshield in 

front of the front camera is 

fogged up or covered with con-

densation, or ice, use the wind-

shield defogger to remove the 

fog, condensation, or ice. 

(



P.387, 392)

●

If water droplets cannot be 

properly removed from the area 

of the windshield in front of the 

front camera by the windshield 

wipers, replace the wiper insert 

or wiper blade.

If the wiper inserts or wiper blades 
need to be replaced, contact your 
Toyota dealer.

●

Do not attach window tint to the 

windshield.

●

Replace the windshield if it is 

damaged or cracked.

If the windshield needs to be 

replaced, contact your Toyota 

dealer.

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WARNING

●

Do not allow liquids to contact 

the front camera.

●

Do not allow bright lights to 

shine into the front camera.

●

Do not dirty or damage the front 

camera.

When cleaning the inside of the 

windshield, do not allow glass 

cleaner to contact the lens of 

the front camera. Also, do not 

touch the lens.

If the lens is dirty or damaged, 

contact your Toyota dealer.

●

Do not subject the front camera 

to a strong impact.

●

Do not change the installation 

position or direction of the front 

camera or remove it.

●

Do not disassemble the front 

camera.

●

Do not modify any components 

of the vehicle around the front 

camera (inside rear view mirror, 

etc.) or ceiling.

●

Do not attach any accessories 

to the hood, front grille or front 

bumper that may obstruct the 

front camera. Contact your Toy-

ota dealer for details.

●

If a surfboard or other long 

object is to be mounted on the 

roof, make sure that it will not 

obstruct the front camera.

●

Do not modify the headlights or 

other lights.

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4-5. Using the driving support systems

■

Certification



Except for vehicles sold in Canada



For vehicles sold in Canada

185

4-5. Using the driving support systems

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■

If a warning message is displayed on the multi-information display

A system may be temporarily unavailable or there may be a malfunction in 

the system.

●

In the following situations, perform the actions specified in the table. When 

the normal operating conditions are detected, the message will disappear 

and the system will become operational.

If the message does not disappear, contact your Toyota dealer.

Situation

Actions

When the area around a sensor is 
covered with dirt, moisture (fogged 
up, covered with condensation, ice, 
etc.), or other foreign matter

To clean the part of the windshield in 
front of the front camera, use the 
windshield wipers or the windshield 
defogger of the air conditioning sys-
tem (P.387, 392).

186

4-5. Using the driving support systems

●

In the following situations, if the situation has changed (or the vehicle has 

been driven for some time) and the normal operating conditions are 

detected, the message will disappear and the system will become opera-

tional.

If the message does not disappear, contact your Toyota dealer.

• When the temperature around the radar sensor is outside of the opera-

tional range, such as when the vehicle is in the sun or in an extremely cold 

environment

• When the front camera cannot detect objects in front of the vehicle, such 

as when driving in the dark, snow, or fog, or when bright lights are shining 

into the front camera

When the temperature around the 
front camera is outside of the opera-
tional range, such as when the vehi-
cle is in the sun or in an extremely 
cold environment

If the front camera is hot, such as 
after the vehicle had been parked in 
the sun, use the air conditioning sys-
tem to decrease the temperature 
around the front camera.
If a sunshade was used when the 
vehicle was parked, depending on its 
type, the sunlight reflected from the 
surface of the sunshade may cause 
the temperature of the front camera 
to become excessively high.

If the front camera is cold, such after 
the vehicle is parked in an extremely 
cold environment, use the air condi-
tioning system to increase the tem-
perature around the front camera.

The area in front of the front camera 
is obstructed, such as when the 
hood is open or a sticker is attached 
to the part of the windshield in front 
of the front camera.

Close the hood, remove the sticker, 
etc. to clear the obstruction.

Situation

Actions

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The system can detect the fol-
lowing:


Vehicles



Bicyclists



Pedestrians

■

Pre-collision warning

When the system determines 
that the possibility of a frontal 
collision is high, a buzzer will 
sound and a warning message 
will be displayed on the 
multi-information display to urge 
the driver to take evasive action.

■

Pre-collision brake assist

When the system determines 
that the possibility of a frontal 
collision is high, the system 
applies greater braking force in 
relation to how strongly the 
brake pedal is depressed.

■

Pre-collision braking

If the system determines that 
the possibility of a frontal colli-
sion is extremely high, the 
brakes are automatically applied 
to help avoid the collision or 
reduce the impact of the colli-
sion.

PCS (Pre-Collision Sys-

tem)

The pre-collision system 
uses a radar sensor and 
front camera to detect 
objects (P.190) in front of 
the vehicle. When the sys-
tem determines that the 
possibility of a frontal colli-
sion with an object is high, a 
warning operates to urge 
the driver to take evasive 
action and the potential 
brake pressure is increased 
to help the driver avoid the 
collision. If the system 
determines that the possi-
bility of a frontal collision 
with an object is extremely 
high, the brakes are auto-
matically applied to help 
avoid the collision or help 
reduce the impact of the col-
lision.

The pre-collision system 
can be disabled/enabled 
and the warning timing can 
be changed. (P.189)

Detectable objects

System functions

188

4-5. Using the driving support systems

WARNING

■

Limitations of the pre-colli-

sion system

●

The driver is solely responsible 

for safe driving. Always drive 

safely, taking care to observe 

your surroundings.

Do not use the pre-collision sys-

tem instead of normal braking 

operations under any circum-

stances. This system will not 

prevent collisions or lessen col-

lision damage or injury in every 

situation. Do not overly rely on 

this system. Failure to do so 

may lead to an accident, result-

ing in death or serious injury.

●

Although this system is 

designed to help avoid a colli-

sion or help reduce the impact 

of the collision, its effectiveness 

may change according to vari-

ous conditions, therefore the 

system may not always be able 

to achieve the same level of 

performance.

Read the following conditions 

carefully. Do not overly rely on 

this system and always drive 

carefully.

• Conditions under which the sys-

tem may operate even if there is 

no possibility of a collision: 



P.191

• Conditions under which the sys-

tem may not operate properly: 



P.192

●

Do not attempt to test the oper-

ation of the pre-collision system 

yourself.

Depending on the objects used 

for testing (dummies, card-

board objects imitating detect-

able objects, etc.), the system 

may not operate properly, possi-

bly leading to an accident.

■

Pre-collision braking

●

When the pre-collision braking 

function is operating, a large 

amount of braking force will be 

applied.

●

If the vehicle is stopped by the 

operation of the pre-collision 

braking function, the pre-colli-

sion braking function operation 

will be canceled after approxi-

mately 2 seconds. Depress the 

brake pedal as necessary.

●

The pre-collision braking func-

tion may not operate if certain 

operations are performed by the 

driver. If the accelerator pedal is 

being depressed strongly or the 

steering wheel is being turned, 

the system may determine that 

the driver is taking evasive 

action and possibly prevent the 

pre-collision braking function 

from operating.

●

In some situations, while the 

pre-collision braking function is 

operating, operation of the func-

tion may be canceled if the 

accelerator pedal is depressed 

strongly or the steering wheel is 

turned and the system deter-

mines that the driver is taking 

evasive action.

●

If the brake pedal is being 

depressed, the system may 

determine that the driver is tak-

ing evasive action and possibly 

delay the operation timing of the 

pre-collision braking function.

■

When to disable the pre-colli-

sion system

In the following situations, disable 

the system, as it may not operate 

properly, possibly leading to an 

accident resulting in death or seri-

ous injury:

●

When the vehicle is being towed

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■

Enabling/disabling the 
pre-collision system

The pre-collision system can be 
enabled/disabled on 

 

(P.548) of the multi-informa-
tion 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.548) of the multi-informa-
tion display.

The warning timing setting is 
retained when the engine switch is 
turned off. However, if the pre-colli-
sion system is disabled and 
re-enabled, the operation timing will 
return to the default setting (mid-
dle).

WARNING

●

When your vehicle is towing 

another vehicle

●

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 speed-

ometer tester, 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 acci-

dent 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 sen-

sor or front camera is temporar-

ily installed to the vehicle

Changing settings of the 
pre-collision system

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4-5. Using the driving support systems

1

Early

2

Middle

This is the default setting.

3

Late

■

Operational conditions

The pre-collision system is enabled and the system determines that the pos-

sibility of a frontal collision with a detected object is high.

Each function is operational at the following speed

●

Pre-collision warning

●

Pre-collision brake assist

●

Pre-collision braking

Detectable objects

Vehicle speed

Relative speed between 

your vehicle and object

Vehicles

Approx. 7 to 110 mph 

(10 to 180 km/h)

Approx. 7 to 110 mph 

(10 to 180 km/h)

Bicyclists and pedestri-

ans

Approx. 7 to 50 mph (10 

to 80 km/h)

Approx. 7 to 50 mph (10 

to 80 km/h)

Detectable objects

Vehicle speed

Relative speed between 

your vehicle and object

Vehicles

Approx. 20 to 110 mph 

(30 to 180 km/h)

Approx. 20 to 110 mph 

(30 to 180 km/h)

Bicyclists and pedestri-

ans

Approx. 20 to 50 mph 

(30 to 80 km/h)

Approx. 20 to 50 mph 

(30 to 80 km/h)

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The system may not operate in the following situations:

●

If a battery terminal has been disconnected and reconnected and then the 

vehicle has not been driven for a certain amount of time

●

If the shift lever is in R

●

When the VSC OFF indicator is illuminated (only the pre-collision warning 

function will be operational)

■

Object detection function

The system detects objects based 

on their size, profile, motion, etc. 

However, an object may not be 

detected depending on the sur-

rounding brightness and the motion, 

posture, and angle of the detected 

object, preventing the system from 

operating properly. (P.192)

The illustration shows an image of 

detectable objects.

■

Cancelation of the pre-collision 

braking

If either of the following occur while 

the pre-collision braking function is 

operating, it will be canceled:

●

The accelerator pedal is 

depressed strongly.

●

The steering wheel is turned 

sharply or abruptly.

■

Conditions under which the 

system may operate even if 

there is no possibility of a colli-

sion

●

In some situations such as the fol-

lowing, the system may determine 

that there is a possibility of a fron-

tal collision and operate.

• When passing a detectable object, 

etc.

• When changing lanes while over-

taking a detectable object, etc.

• When approaching a detectable 

object in an adjacent lane or on 

the roadside, such as when 

changing the course of travel or 

driving on a winding road

• When rapidly closing on a detect-

able object, etc.

• When approaching objects on the 

roadside, such as detectable 

objects, guardrails, utility poles, 

trees, or walls

• When there is a detectable object 

or other object by the roadside at 

the entrance of a curve

Detectable objects

Vehicle speed

Relative speed between 

your vehicle and object

Vehicles

Approx. 7 to 110 mph 

(10 to 180 km/h)

Approx. 7 to 110 mph 

(10 to 180 km/h)

Bicyclists and pedestri-

ans

Approx. 7 to 50 mph (10 

to 80 km/h)

Approx. 7 to 50 mph (10 

to 80 km/h)

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4-5. Using the driving support systems

• When there are patterns or paint 

in front of your vehicle that may be 

mistaken for a detectable object

• When the front of your vehicle is 

hit by water, snow, dust, etc.

• When overtaking a detectable 

object that is changing lanes or 

making a right/left turn

• When passing a detectable object 

in an oncoming lane that is 

stopped to make a right/left turn

• When a detectable object 

approaches very close and then 

stops before entering the path of 

your vehicle

• If the front of your vehicle is raised 

or lowered, such as when on an 

uneven or undulating road surface

• When driving on a road sur-

rounded by a structure, such as in 

a tunnel or on an iron bridge

• When there is a metal object 

(manhole cover, steel plate, etc.), 

steps, or a protrusion in front of 

your vehicle

• When passing under an object 

(road sign, billboard, etc.)

• When approaching an electric toll 

gate barrier, parking area barrier, 

or other barrier that opens and 

closes

• When using an automatic car 

wash

• When driving through or under 

objects that may contact your 

vehicle, such as thick grass, tree 

branches, or a banner

• When driving through steam or 

smoke

• When driving near an object that 

reflects radio waves, such as a 

large truck or guardrail

• When driving near a TV tower, 

broadcasting station, electric 

power plant, or other location 

where strong radio waves or elec-

trical noise may be present

■

Situations in which the system 

may not operate properly

●

In some situations such as the fol-

lowing, an object may not be 

detected by the radar sensor and 

front camera, preventing the sys-

tem from operating properly:

• When a detectable object is 

approaching your vehicle

• When your vehicle or a detectable 

object is wobbling

• If a detectable object makes an 

abrupt maneuver (such as sudden 

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swerving, acceleration or deceler-

ation)

• When your vehicle approaches a 

detectable object rapidly

• When a detectable object is not 

directly in front of your vehicle

• When a detectable object is near 

a wall, fence, guardrail, manhole 

cover, vehicle, steel plate on the 

road, etc.

• When a detectable object is under 

a structure

• When part of a detectable object 

is hidden by an object, such as 

large baggage, an umbrella, or 

guardrail

• When multiple detectable objects 

are close together

• If the sun or other light is shining 

directly on a detectable object

• When a detectable object is a 

shade of white and looks 

extremely bright

• When a detectable object appears 

to be nearly the same color or 

brightness as its surroundings

• If a detectable object cuts or sud-

denly emerges in front of your 

vehicle 

• When the front of your vehicle is 

hit by water, snow, dust, etc.

• When a very bright light ahead, 

such as the sun or the headlights 

of oncoming traffic, shines directly 

into the front camera

• When approaching the side or 

front of a vehicle ahead

• If a vehicle ahead is a motorcycle

• If a vehicle ahead is narrow, such 

as a personal mobility vehicle

• If a preceding vehicle has a small 

rear end, such as an unloaded 

truck

• If a preceding vehicle has a low 

rear end, such as a low bed trailer

• If a vehicle ahead has extremely 

high ground clearance

• If a vehicle ahead is carrying a 

load which protrudes past its rear 

bumper

• If a vehicle ahead is irregularly 

shaped, such as a tractor or side 

car

• If a vehicle ahead is a child sized 

bicycle, a bicycle that is carrying a 

large load, a bicycle ridden by 

more than one person, or a 

uniquely shaped bicycle (bicycle 

with a child seat, tandem bicycle, 

etc.)

• If a pedestrian/or the riding height 

of a bicyclist ahead is shorter than 

approximately 3.2 ft. (1 m) or taller 

than approximately 6.5 ft. (2 m)

• If a pedestrian/bicyclist is wearing 

oversized clothing (a rain coat, 

long skirt, etc.), making their sil-

houette obscure

• If a pedestrian is bending forward 

or squatting or bicyclist is bending 

forward

• If a pedestrian/bicyclist is moving 

fast

• If a pedestrian is pushing a 

stroller, wheelchair, bicycle or 

other vehicle

• When driving in inclement weather 

such as heavy rain, fog, snow or a 

sandstorm

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4-5. Using the driving support systems

• When driving through steam or 

smoke

• When the surrounding area is dim, 

such as at dawn or dusk, or while 

at night or in a tunnel, making a 

detectable object appear to be 

nearly the same color as its sur-

roundings

• When driving in a place where the 

surrounding brightness changes 

suddenly, such as at the entrance 

or exit of a tunnel

• After the engine has started the 

vehicle has not been driven for a 

certain amount of time

• While making a left/right turn and 

for a few seconds after making a 

left/right turn

• While driving on a curve and for a 

few seconds after driving on a 

curve

• If your vehicle is skidding

• If the front of the vehicle is raised 

or lowered

• If the wheels are misaligned

• If a wiper blade is blocking the 

front camera

• The vehicle is being driven at 

extremely high speeds

• When driving on a hill

• If the radar sensor or front camera 

is misaligned

●

In some situations such as the fol-

lowing, sufficient braking force 

may not be obtained, preventing 

the system from performing prop-

erly:

• 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 exces-

sively worn, improper tire inflation 

pressure, etc.)

• When the vehicle is being driven 

on a gravel road or other slippery 

surface

■

If VSC is disabled

●

If VSC is disabled (P.252), 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-Colli-

sion Brake System Unavailable” 

will be displayed on the 

multi-information display.

195

4-5. Using the driving support systems

4

Dr

iv

ing

*

: 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 with 
full-speed range 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 
preceding vehicles using 
the front camera and radar.

*

: Boundary between asphalt and 

the side of the road, such as 
grass, soil, or a curb

WARNING

■

Before using LTA system

●

Do not rely solely upon the LTA 

system. The LTA system does 

not automatically drive the vehi-

cle 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 atten-

tion to the surrounding condi-

tions and operating the steering 

wheel to correct 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 

driving operations and pay care-

ful 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 

system off.

■

Situations unsuitable for LTA 

system

In the following situations, use the 

LTA switch to turn the system off. 

Failure to do so may lead to an 

accident, resulting in death or 

serious injury.

196

4-5. Using the driving support systems

WARNING

●

Vehicle is driven on a road sur-

face 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 

construction work.

●

Vehicle is driven in a construc-

tion zone.

●

A spare tire, tire chains, etc. are 

equipped.

●

When the tires have been 

excessively worn, or when the 

tire inflation pressure is low.

●

When tires of a size other than 

specified are installed.

●

Vehicle is driven in traffic lanes 

other than that highways and 

freeways.

●

During emergency towing.

■

Preventing LTA system mal-

functions and operations per-

formed by mistake

●

Do not modify the headlights or 

place stickers, etc. on the sur-

face of the lights.

●

Do not modify the suspension 

etc. If the suspension etc. needs 

to be replaced, contact your 

Toyota dealer.

●

Do not install or place anything 

on the hood or grille. Also, do 

not install a grille guard (bull 

bars, kangaroo bar, etc.).

●

If your windshield needs 

repairs, contact your Toyota 

dealer.

■

Conditions in which functions 

may not operate properly

In the following situations, the 

functions may not operate prop-

erly 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.

●

When the follow-up cruising dis-

play is displayed (



P.201) and 

the preceding vehicle changes 

lanes. (Your vehicle may follow 

the preceding vehicle and also 

change lanes.)

●

When the follow-up cruising dis-

play is displayed (



P.201) and 

the preceding vehicle is sway-

ing. (Your vehicle may sway 

accordingly and depart from the 

lane.)

●

When the follow-up cruising dis-

play is displayed (



P.201) and 

the preceding vehicle departs 

from its lane. (Your vehicle may 

follow the preceding vehicle and 

depart from the lane.)

●

When the follow-up cruising dis-

play is displayed (



P.201) and 

the preceding vehicle is being 

driven extremely close to the 

left/right lane line. (Your vehicle 

may follow the preceding vehi-

cle and depart from the lane.)

197

4-5. Using the driving support systems

4

Dr

iv

ing

WARNING

●

Vehicle is being driven around a 

sharp curve.

●

Objects or patterns that could 

be mistaken for white (yellow) 

lines are present on the side of 

the road (guardrails, reflective 

poles, etc.).

●

Vehicle is driven where the road 

diverges, merges, etc.

●

Repair marks of asphalt, white 

(yellow) lines, etc. are present 

due to road repair.

●

There are shadows on the road 

that run parallel with, or cover, 

the white (yellow) lines.

●

The vehicle is driven in an area 

without white (yellow) lines, 

such as in front of a tollgate or 

checkpoint, or at an intersec-

tion, etc.

●

The white (yellow) lines are 

cracked, “Botts’ dots”, “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 

surface that is wet due to rain, 

puddles, 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 sur-

face that is bright due to 

reflected light, etc.

●

The vehicle is driven in an area 

where the brightness changes 

suddenly, 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 wind-

ing road.