Toyota 4Runner (2020 year). Instruction - part 17

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■

If the PCS warning light flashes or illuminates and a warning message is
displayed on the multi-information display

The pre-collision system may be temporarily unavailable or there may be a
malfunction in the system.

●

In  the  following  situations,  the  warning  light  will  turn  off,  the  message  will
disappear and the system will become operational when normal operating
conditions return:
• When the radar sensor or camera sensor or the area around either sen-

sor is hot, such as in the sun

• When the radar sensor or camera sensor or the area around either sen-

sor is cold, such as in an extremely cold environment

• When a front sensor is dirty or covered with snow, etc.
• When the part of the windshield in front of the camera sensor is fogged

up or covered with condensation or ice 
(Defogging the windshield: 



P. 342, 348)

• If the camera sensor is obstructed, such as when the hood is open or a

sticker is attached to the windshield near the camera sensor

●

If  the  PCS  warning  light  continues  to  flash  or  remains  illuminated  or  the
warning message does not disappear even though the vehicle has returned
to normal, the system may be malfunctioning. Have the vehicle inspected by
your Toyota dealer immediately.

■

If VSC is disabled

●

If VSC is disabled (



P. 323, 324), the pre-collision brake assist and pre-col-

lision 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.

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When driving on roads with white (yellow) lines, this function alerts the
driver when the vehicle might depart from its lane.
The  LDA  system  recognizes  visi-
ble  white  (yellow)  lines  with  the
camera sensor on the upper por-
tion of the windshield.

LDA (Lane Departure Alert)

Summary of functions

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◆

Lane departure alert function

When  the  system  determines
that  the  vehicle  might  depart
from  its  lane,  a  warning  is  dis-
played  on  the  multi-information
display and the warning buzzer
sounds to alert the driver.

When  the  warning  buzzer
sounds,  check  the  surrounding
road  situation  and  carefully
operate  the  steering  wheel  to
move  the  vehicle  back  to  the
center of the lane.

◆

Vehicle sway warning function

When the vehicle is swaying or
appears as if it may depart from
its  lane  multiple  times,  the
warning  buzzer  sounds  and  a
message  is  displayed  on  the
multi-information display to alert
the driver.

Functions included in LDA system

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WARNING

■

Before using LDA system

Do not rely solely upon the LDA system. The LDA system does not auto-
matically 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 surround-
ing  conditions 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 careful attention
may lead to an accident, resulting in death or serious injury.

■

To avoid operating LDA system by mistake

When not using the LDA system, use the LDA switch to turn the system off.

■

Situations unsuitable for LDA system

Do not use the LDA system in the following situations.
The system may not operate properly and lead to an accident, resulting in
death or serious injury.

●

A spare tire, tire chains, etc. are equipped.

●

Objects  or  patterns  that  could  be  mistaken  for  white  (yellow)  lines  are
present on the side of the road (guardrails, curbs, reflective poles, etc.).

●

Vehicle is driven on a snow-covered road.

●

White (yellow) lines are difficult to see due to rain, snow, fog, dust, etc.

●

Asphalt  repair  marks,  white  (yellow)  line  marks,  etc.  are  present  due  to
road repair.

●

Vehicle is driven in a temporary lane or restricted lane due to construction
work.

●

Vehicle is driven in a construction zone.

■

Preventing  LDA  system  malfunctions  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 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.

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Press  the  LDA  switch  to  turn  the
LDA system on.

The  LDA  indicator  illuminates  and
a  message  is  displayed  on  the
multi-information display.
Press the LDA switch again to turn
the LDA system off.
When the LDA system is turned on
or off, operation of the LDA system
continues  in  the  same  condition
the next time the engine is started.

Turning LDA system on

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The illustration used is intended as an example, and may differ from
the image that is actually displayed on the multi-information display.

LDA indicator
The illumination condition of the
indicator  informs  the  driver  of
the system operation status.

Illuminated in green: 
LDA system is operating.
Flashing in Yellow: 
Lane  departure  alert  function  is
operating.

Lane  departure  alert  function
display
Displayed when the multi-infor-
mation  display  is  switched  to
the  driving  assist  system  infor-
mation screen.

Indications on multi-information display

1

2



Inside  of  displayed  white  lines
is white



Inside of displayed white lines
is black

Indicates that the system is recog-
nizing  white  (yellow)  lines.  When
the  vehicle  departs  from  its  lane,
the  white  line  displayed  on  the
side  the  vehicle  departs  from
flashes yellow.

Indicates  that  the  system  is  not
able  to  recognize  white  (yellow)
lines or is temporarily canceled.

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■

Operation conditions of each function

●

Lane departure alert function
This function operates when all of the following conditions are met.
• LDA is turned on.
• Vehicle speed is approximately 32 mph (50 km/h) or more.
• System recognizes white (yellow) lines.
• Width of traffic lane is approximately 9.8 ft. (3 m) or more.
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or around a gentle curve with a radius

of more than approximately 492 ft. (150 m).

• No system malfunctions are detected. (



P. 272)

●

Vehicle sway warning function
This function operates when all of the following conditions are met.

• Setting for “Sway Warning” in 

 of the multi-information display is set to

“On”. (



P. 96)

• Vehicle speed is approximately 32 mph (50 km/h) or more.
• Width of traffic lane is approximately 9.8 ft. (3 m) or more.
• No system malfunctions are detected. (



P. 272)

■

Temporary cancellation of functions

When the operation conditions are no longer met, a function may be tempo-
rarily canceled. However, when the operation conditions are met again, oper-
ation of the function is automatically restored. (



P. 270)

■

Lane departure alert function

The warning buzzer may be difficult to hear due to external noise, audio play-
back, etc.

■

Vehicle sway warning function

Depending on the vehicle and road conditions, the warning may not operate.

■

White (yellow) lines are only on one side of road

The  LDA  system  will  not  operate  for  the  side  on  which  white  (yellow)  lines
could not be recognized.

When  the  system  determines  that  the
vehicle is swaying while the vehicle sway
warning  function  is  operating,  a  buzzer
sounds  and  a  warning  message  urging
the driver to rest and  the  symbol shown
in the illustration are simultaneously dis-
played on the multi-information display.

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■

Conditions in which functions may not operate properly

In the following situations, the camera sensor may not detect white (yellow)
lines and various functions may not operate normally.

●

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 intersection, 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.

●

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  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 where the road diverges, merges, etc.

●

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 vehicle is driven around a sharp curve.

●

The traffic lane is excessively narrow or wide.

●

The  vehicle  is  extremely  tilted  due  to  carrying  heavy  luggage  or  having
improper tire pressure.

●

The distance to the preceding vehicle is extremely short.

●

The vehicle is moving up and down a large amount due to road conditions
during driving (poor roads or road seams).

●

The headlight lenses are dirty and emit a faint amount of light at night, or the
beam axis has deviated.

●

The vehicle has just changed lanes or crossed an intersection.

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Warning message

If the following warning message is displayed on the multi-information display
and  the  LDA  indicator  illuminates  in  amber,  follow  the  appropriate  trouble-
shooting procedure.

If a different warning message is displayed, follow the instructions displayed
on the screen.

■

Customization

Some functions can be customized. (



P. 547)

Warning message

Details/Actions

“LDA Malfunction 

Visit Your Dealer”

The  system  may  not  be  operating
properly.



Have  the  vehicle  inspected  at  your
Toyota dealer. 

“Front Camera Unavailable”

The  operation  conditions  of  the  cam-
era  sensor  (temperature, etc.) are not
met.



When  the  operation  conditions  of
the  camera  sensor  (temperature,
etc.)  are  met,  the  LDA  system  will
become  available.  Turn  the  LDA
system  off,  wait  for  a  little  while,
and then turn the LDA system back
on.

“LDA Unavailable”

The  LDA  system  is  temporarily  can-
celed due to a malfunction in a sensor
other than the camera sensor.



Turn the LDA system off and follow
the  appropriate  troubleshooting
procedures  for  the  warning  mes-
sage.  Afterward,  drive  the  vehicle
for  a  short  time,  and  then  turn  the
LDA system back on.

“LDA Unavailable Below 

Approx 32MPH”

The  LDA  system  cannot  be  used  as
the vehicle speed is less than approxi-
mately 32 mph (50 km/h).



Drive  the  vehicle  at  approximately
32 mph (50 km/h) or more.

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In vehicle-to-vehicle distance control mode, the vehicle automatically
accelerates and decelerates to match the speed changes of the pre-
ceding vehicle even if the accelerator pedal is not depressed. In con-
stant speed control mode, the vehicle runs at a fixed speed.
Use the dynamic radar cruise control on freeways and highways.

●

Vehicle-to-vehicle distance control mode (



P. 277)

●

Constant speed control mode (



P. 282)

Display
Indicators
Set speed
Vehicle-to-vehicle 

distance

switch
Cruise control switch

Dynamic radar cruise control

Summary of functions

1

2

3

4

5

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WARNING

■

Before using dynamic radar cruise control

●

Driving safely is the sole responsibility of the driver. Do not rely solely on
the system, and drive safely by always paying careful attention to your sur-
roundings.

●

The dynamic radar cruise control provides driving assistance to reduce the
driver's burden. However, there are limitations to the assistance provided.
Read the following conditions carefully. Do not overly rely on this system
and always drive carefully.
• When the sensor may not be correctly detecting the vehicle ahead: 



P. 284

• Conditions  under  which  the  vehicle-to-vehicle  distance  control  mode

may not function correctly: 



P. 285

●

Set the speed appropriately depending on the speed limit, traffic flow, road
conditions, weather conditions, etc. The driver is responsible for checking
the set speed.

●

Even when the system is functioning normally, the condition of the preced-
ing  vehicle  as  detected  by  the  system  may  differ  from  the  condition
observed  by  the  driver.  Therefore,  the  driver  must  always  remain  alert,
assess the danger of each situation and drive safely. Relying on this sys-
tem or assuming the system ensures safety while driving can lead to an
accident, resulting in death or serious injury.

●

Switch  the  dynamic  radar  cruise  control  off  using  the  “ON-OFF”  button
when not in use.

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WARNING

■

Cautions regarding the driving assist systems

Observe the following precautions, as there are limitations to the assistance
provided by the system.
Failure to do so may cause an accident resulting in death or serious injury.

●

Assisting the driver to measure following distance
The  dynamic  radar  cruise  control  is  only  intended  to  help  the  driver  in
determining the following distance between the driver’s own vehicle and a
designated vehicle traveling ahead. It is not a mechanism that allows care-
less or inattentive driving, and it is not a system that can assist the driver in
low-visibility conditions. It is still necessary for driver to pay close attention
to the vehicle’s surroundings.

●

Assisting the driver to judge proper following distance
The  dynamic  radar  cruise  control  determines  whether  the  following  dis-
tance between the driver’s own vehicle and a designated vehicle traveling
ahead is within a set range. It is not capable of making any other type of
judgement. Therefore,  it  is  absolutely  necessary  for  the  driver  to  remain
vigilant and to determine whether or not there is a possibility of danger in
any given situation.

●

Assisting the driver to operate the vehicle
The dynamic radar cruise control has limited capability to prevent or avoid
a  collision  with a  vehicle  traveling  ahead. Therefore,  if  there  is  ever  any
danger,  the  driver  must  take  immediate  and  direct  control  of  the  vehicle
and act appropriately in order to ensure the safety of all involved.

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WARNING

■

Situations unsuitable for dynamic radar cruise control

Do not use dynamic radar cruise control in any of the following situations.
Doing so may result in inappropriate speed control and could cause an acci-
dent resulting in death or serious injury.

●

Roads where there are pedestrians, cyclers, etc.

●

In heavy traffic

●

On roads with sharp bends

●

On winding roads

●

On slippery roads, such as those covered with rain, ice or snow

●

On steep downhills, or where there are sudden changes between sharp up
and down gradients 
Vehicle speed may exceed the set speed when driving down a steep hill.

●

At entrances to freeways and highways

●

When weather conditions are bad enough that they may prevent the sen-
sors from detecting correctly (fog, snow, sandstorm, heavy rain, etc.)

●

When there is rain, snow, etc. on the front surface of the radar sensor or
camera sensor

●

In traffic conditions that require frequent repeated acceleration and decel-
eration

●

When your vehicle is towing a trailer or during emergency towing

●

When an approach warning buzzer is heard often

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This mode employs a radar sensor to detect the presence of vehicles
up  to  approximately  320  ft.  (100  m)  ahead,  determines  the  current
vehicle-to-vehicle following distance, and operates to maintain a suit-
able following distance from the vehicle ahead.

Note  that  vehicle-to-vehicle  distance  will  close  in  when  traveling  on  long
downhill slopes.

Example of constant speed cruising
When there are no vehicles ahead

The vehicle travels at the speed set by the driver. The desired vehicle-to-
vehicle  distance  can  also  be  set  by  operating  the  vehicle-to-vehicle  dis-
tance switch.

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
decelerates  your  vehicle.  When  a  greater  reduction  in  vehicle  speed  is
necessary, the system 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 vehicle-to-vehicle distance set by the driver.
Approach  warning  warns  you  when  the  system  cannot  decelerate  suffi-
ciently to prevent your vehicle from closing in on the vehicle ahead.

Example of acceleration 
When  there  are  no  longer  any  preceding  vehicles  driving  slower
than the set speed

The system accelerates until the set speed is reached. The system then
returns to constant speed cruising.

Driving in vehicle-to-vehicle distance control mode

1

2

3

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Press  the  “ON-OFF”  button  to
activate the cruise control.

Radar  cruise  control  indicator  will
come  on  and  a  message  will  be
displayed  on  the  multi-information
display.
Press  the  button  again  to  deacti-
vate the cruise control.
If  the  “ON-OFF”  button  is  pressed
and held for 1.5 seconds or more,
the  system  turns  on  in  constant
speed control mode. (



P. 282)

Accelerate  or  decelerate,  with
accelerator  pedal  operation,  to
the desired vehicle speed (at or
above  approximately  30  mph
[50  km/h])  and  push  the  lever
down to set the speed.

Cruise  control  “SET”  indicator  will
come on.
The  vehicle  speed  at  the  moment
the  lever  is  released  becomes  the
set speed.

Setting  the  vehicle  speed  (vehicle-to-vehicle  distance  control
mode)

1

2

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To change the set speed, operate the lever until the desired set speed
is displayed.

Increases the speed
Decreases the speed

Fine  adjustment:  Momentarily
move  the  lever  in  the  desired
direction.
Large  adjustment:  Hold  the  lever
up or down to change the speed,
and  release  when  the  desired
speed is reached.
In the vehicle-to-vehicle distance control mode, the set speed will be
increased or decreased as follows:



For U.S. mainland and Hawaii

Fine adjustment: By 1 mph (1.6 km/h)

*

1

 or 1 km/h (0.6 mph)

*

2

 each time

the lever is operated
Large adjustment: Increases or decreases in 1 mph (1.6 km/h) 

*

1

 or 1 km/h

(0.6 mph)

*

2

 increments for as long as the lever is held



Except for U.S. mainland and Hawaii

Fine adjustment: By 1 mph (1.6 km/h)

*

1

 or 1 km/h (0.6 mph)

*

2

 each time

the lever is operated
Large adjustment: Increases or decreases in 5 mph (8 km/h)

*

1

 or 5 km/h

(3.1 mph)

*

2

 increments for as long as the lever is held

In the constant speed control mode (



P. 282), the set speed will be

increased or decreased as follows:

Fine adjustment: By 1 mph (1.6 km/h)

*

1

 or 1 km/h (0.6 mph)

*

2

 each time

the lever is operated
Large  adjustment:  The  speed  will  continue  to  change  while  the  lever  is
held.

*

1

:  When the set speed is shown in “MPH”

*

2

:  When the set speed is shown in “km/h”

Adjusting the set speed

1

2