LEXUS IS 300 (2019 year). Instruction - part 16

248

4-5. Using the driving support systems

IS350 AWD/IS350/IS300 AWD/IS300_U

In vehicle-to-vehicle distance control mode, the vehicle automatically acceler-
ates and decelerates to match the speed changes of the preceding vehicle even
if the accelerator pedal is not depressed. In constant 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. 251)

●

Constant speed control mode (

P. 256)

Vehicle-to-vehicle distance switch
Display
Set speed
Indicators
Cruise control switch

Dynamic radar cruise control

Summary of functions

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 surroundings.

●

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. 258

• Conditions under which the vehicle-to-vehicle distance control mode may not

function correctly:

P. 259

●

Set the speed appropriately depending on the speed limit, traffic flow, road condi-

tions, weather conditions, etc. The driver is responsible for checking the set speed.

●

Even when the system is functioning normally, the condition of the preceding 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 system 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.

■

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 careless 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 distance

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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4-5. Using the driving support systems

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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 accident result-

ing in death or serious injury.

●

Roads where there are pedestrians, cyclists, 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 sensors 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 sen-

sor

●

In traffic conditions that require frequent repeated acceleration and deceleration

●

During emergency towing

●

When an approach warning buzzer is heard often

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4-5. Using the driving support systems

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IS350 AWD/IS350/IS300 AWD/IS300_U

This mode employs a radar sensor to detect the presence of vehicles up to
approximately 328 ft. (100 m) ahead, determines the current vehicle-to-vehicle
following distance, and operates to maintain a suitable following distance from
the vehicle ahead.

Note that vehicle-to-vehicle distance will close in when traveling on 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 dis-

tance can also be set by operating the vehicle-to-vehicle distance 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 deceler-

ates 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 sufficiently 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 con-

stant speed cruising.

Driving in vehicle-to-vehicle distance control mode

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4-5. Using the driving support systems

IS350 AWD/IS350/IS300 AWD/IS300_U

Press the “ON/OFF” button to acti-
vate 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 deactivate 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. 256)

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)

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4-5. Using the driving support systems

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IS350 AWD/IS350/IS300 AWD/IS300_U

To change the set speed, operate the lever until the desired set speed is dis-
played.

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 the U.S. mainland and Hawaii
Fine adjustment: By 1 mph (1.6 km/h)

or 1 km/h (0.6 mph)

each time the lever is

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

or 1 km/h (0.6 mph)

increments for as long as the lever is held



For Canada, Guam and Puerto Rico
Fine adjustment: By 1 mph (1.6 km/h)

or 1 km/h (0.6 mph)

each time the lever is

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

or 5 km/h (3.1 mph)

increments for as long as the lever is held

In the constant speed control mode (

P. 256), the set speed will be increased

or decreased as follows:

Fine adjustment: By 1 mph (1.6 km/h)

or 1.6 km/h (1 mph)

each time the lever is

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

: When the set speed is shown in “MPH”

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

Adjusting the set speed

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4-5. Using the driving support systems

IS350 AWD/IS350/IS300 AWD/IS300_U

Pressing the switch changes the vehi-
cle-to-vehicle distance as follows:

Long
Medium
Short

The vehicle-to-vehicle distance is set

automatically to long mode when the

engine switch is turned to IGNITION

ON mode.
If a vehicle is running ahead of you, the preceding vehicle mark will also be displayed.

Select a distance from the table below. Note that the distances shown corre-
spond to a vehicle speed of 50 mph (80 km/h). Vehicle-to-vehicle distance
increases/decreases in accordance with vehicle speed.

Pulling the lever toward you cancels
the speed control.

The speed control is also canceled when

the brake pedal is depressed.

Pushing the lever up resumes the
cruise control and returns vehicle
speed to the set speed.

However, cruise control does not

resume when the vehicle speed is

approximately 25 mph (40 km/h) or

less.

Changing the vehicle-to-vehicle distance (vehicle-to-vehicle distance
control mode)

Preceding
vehicle mark

2
3

Vehicle-to-vehicle distance settings (vehicle-to-vehicle distance con-
trol mode)

Distance options

Vehicle-to-vehicle distance

Long

Approximately 160 ft. (50 m)

Medium

Approximately 130 ft. (40 m)

Short

Approximately 100 ft.(30 m)

Canceling and resuming the speed control

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4-5. Using the driving support systems

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IS350 AWD/IS350/IS300 AWD/IS300_U

When your vehicle is too close to a
vehicle ahead, and sufficient automatic
deceleration via the cruise control is
not possible, the display will flash and
the buzzer will sound to alert the driver.
An example of this would be if another
driver cuts in front of you while you are
following a vehicle. Depress the brake
pedal to ensure an appropriate vehicle-
to-vehicle distance.

■

Warnings may not occur when
In the following instances, warnings may not occur even when the vehicle-to-
vehicle distance is small.

●

When the speed of the preceding vehicle matches or exceeds your vehicle
speed

●

When the preceding vehicle is traveling at an extremely slow speed

●

Immediately after the cruise control speed was set

●

When depressing the accelerator pedal

Approach warning (vehicle-to-vehicle distance control mode)

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4-5. Using the driving support systems

IS350 AWD/IS350/IS300 AWD/IS300_U

When constant speed control mode is selected, your vehicle will maintain a set
speed without controlling the vehicle-to-vehicle distance. Select this mode only
when vehicle-to-vehicle distance control mode does not function correctly due
to a dirty radar sensor, etc.

With the cruise control off, press and
hold the “ON/OFF” button for 1.5
seconds or more.

Immediately after the “ON/OFF” but-

ton is pressed, the radar cruise control

indicator will come on. Afterwards, it

switches to the cruise control indicator.
Switching to constant speed control

mode is only possible when operating

the lever with the cruise control off.

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.
Adjusting the speed setting:

P. 253

Canceling and resuming the speed setting:

P. 254

Selecting constant speed control mode

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IS350 AWD/IS350/IS300 AWD/IS300_U

■

Dynamic radar cruise control can be set when

●

The shift lever is in D.

●

Range 4 or higher of D has been selected by using the paddle shift switch.

●

Vehicle speed is at or above approximately 30 mph (50 km/h).

■

Accelerating after setting the vehicle speed
The vehicle can accelerate by operating the accelerator pedal. After accelerating, the

set speed resumes. However, during vehicle-to-vehicle distance control mode, the vehi-

cle speed may decrease below the set speed in order to maintain the distance to the pre-

ceding vehicle.

■

Automatic cancelation of vehicle-to-vehicle distance control mode
Vehicle-to-vehicle distance control mode is automatically canceled in the following situ-

ations:

●

Actual vehicle speed falls at or below approximately 25 mph (40 km/h).

●

VSC is activated.

●

TRAC is activated for a period of time.

●

When the VSC or TRAC system is turned off.

●

When snow mode is set.

●

The sensor cannot detect correctly because it is covered in some way.

●

Pre-collision braking is activated.

If vehicle-to-vehicle distance control mode is automatically canceled for any other rea-

son, there may be a malfunction in the system. Contact your Lexus dealer.

■

Automatic cancelation of constant speed control mode
Constant speed control mode is automatically canceled in the following situations:

●

Actual vehicle speed is more than approximately 10 mph (16 km/h) below the set vehi-

cle speed.

●

Actual vehicle speed falls below approximately 25 mph (40 km/h).

●

VSC is activated.

●

TRAC is activated for a period of time.

●

When the VSC or TRAC system is turned off.

●

Pre-collision braking is activated.

If constant speed control mode is automatically canceled for any other reason, there may

be a malfunction in the system. Contact your Lexus dealer.

■

Brake system operation sound
If the brakes are applied automatically while the vehicle is in vehicle-to-vehicle distance

control mode, a brake system operation sound may be heard. This does not indicate a

malfunction.

■

Warning messages and buzzers for dynamic radar cruise control
Warning messages and buzzers are used to indicate a system malfunction or to inform

the driver of the need for caution while driving. If a warning message is shown on the

multi-information display, read the message and follow the instructions.

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4-5. Using the driving support systems

IS350 AWD/IS350/IS300 AWD/IS300_U

■

When the sensor may not be correctly detecting the vehicle ahead
In the case of the following and depending on the conditions, operate the brake pedal

when deceleration of the system is insufficient or operate the accelerator pedal when

acceleration is required.

As the sensor may not be able to correctly detect these types of vehicles, the approach

warning (

P. 255) may not be activated.

●

Vehicles that cut in suddenly

●

Vehicles traveling at low speeds

●

Vehicles that are not moving in the same lane

●

Vehicles with small rear ends (trailers with no load on board, etc.)

●

Motorcycles traveling in the same lane

●

When water or snow thrown up by the surrounding vehicles hinders the detecting of

the sensor

●

When your vehicle is pointing upwards

(caused by a heavy load in the luggage com-

partment, etc.)

●

Preceding vehicle has an extremely high

ground clearance

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IS350 AWD/IS350/IS300 AWD/IS300_U

■

Conditions under which the vehicle-to-vehicle distance control mode may not function

correctly
In the case of the following conditions, operate the brake pedal (or accelerator pedal,

depending on the situation) as necessary.

As the sensor may not be able to correctly detect vehicles ahead, the system may not

operate properly.

●

When the vehicle ahead of you decelerates suddenly

●

When driving on a road surrounded by a structure, such as in a tunnel or on a bridge

●

While the vehicle speed is decreasing to the set speed after the vehicle accelerates by

depressing the accelerator pedal

●

When the road curves or when the lanes are

narrow

●

When steering wheel operation or your posi-

tion in the lane is unstable

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4-5. Using the driving support systems

IS350 AWD/IS350/IS300 AWD/IS300_U

Turns the intuitive parking assist on/off

When on, the indicator light comes
on to inform the driver that the sys-
tem is operational.

Intuitive parking assist



: If equipped

The distance from your vehicle to nearby obstacles when parallel parking or
maneuvering into a garage is measured by the sensors and communicated via
the displays and a buzzer. Always check the surrounding area when using this
system.

Types of sensors



Except F SPORT models



F SPORT models

Front center sensors
Front corner sensors

Rear corner sensors
Rear center sensors

Intuitive parking assist-sensor switch

3
4

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4-5. Using the driving support systems

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IS350 AWD/IS350/IS300 AWD/IS300_U

When the sensors detect an obstacle, the following displays inform the driver of
the position and distance to the obstacle.

■

Multi-information display

Front corner sensor operation
Front center sensor operation
Rear corner sensor operation
Rear center sensor operation

■

Lexus Display Audio screen

Intuitive parking assist

When the vehicle is moving forward.
A graphic is automatically displayed

when an obstacle is detected. The

screen can be set so that the graphic

is not displayed. (

P. 265)

: Select to mute the buzzer

sounds.

Intuitive parking assist
Rear Cross Traffic Alert (if
equipped)
When the vehicle is moving back-
ward.

A simplified image is displayed on

the upper part of the screen when an

obstacle is detected.

Display

2
3
4

2
3

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4-5. Using the driving support systems

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■

Navigation system screen

Lexus parking assist-sensor
Rear Cross Traffic Alert (if
equipped)

A graphic is automatically displayed

on the side display when an obstacle

is detected. The screen can be set so

that the graphic is not displayed.

(

P. 265)

: Select to mute the buzzer

sounds. This function is available
when the vehicle is moving forward.

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Distance display
Sensors that detect an obstacle will illuminate continuously or blink.

Sensor detection display, obstacle distance

Display

Insert display

Approximate distance to obstacle

Lexus parking

assist moni-

tor

Front corner sensor/

front center sensor

Rear corner sensor/

rear center sensor

(continuous)

(blinking

slowly)

Front center sensor only:

3.3 ft. (100 cm) to 1.6 ft.

(50 cm)

Rear center sensor only:

4.9 ft. (150 cm) to 2.0 ft.

(60 cm)

(continuous)

(blinking)

1.6 ft. (50 cm) to 1.3 ft. (40

cm)

2.0 ft. (60 cm) to 1.5 ft. (45

cm)

(continuous)

(blinking

rapidly)

1.3 ft. (40 cm) to 1.0 ft. (30

cm)

Rear corner sensor:

1.5 ft. (45 cm) to 1.0 ft. (30

cm)

Rear center sensor:

1.5 ft. (45 cm) to 1.1 ft. (35

cm)

(blinking

continuous

)

(continuous)

Less than 1.0 ft. (30 cm)

Rear corner sensor:

Less than 1.0 ft. (30 cm)

Rear center sensor:

Less than 1.1 ft. (35 cm)

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