LEXUS IS 300 (2019 year). Instruction - part 18

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●

Distance guide lines
Visually check the surroundings
and the area behind the vehicle.
On the screen, it appears that a
truck is parking at point 

. How-

ever, in reality if you back up to
point 

, you will hit the truck.

On the screen, it appears that 
is closest and 

 is farthest away.

However, in reality, the distance to

 and 

 is the same and 

 is

farther than 

 and 

.

2

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1

3

1

3

2

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If you notice any symptoms
If you notice any of the following symptoms, refer to the likely cause and the
solution, and re-check.
If the symptom is not resolved by the solution, have the vehicle inspected by
your Lexus dealer.

Things you should know

Likely cause

Solution

 The image is difficult to see

• The vehicle is in a dark area

• The temperature around the lens is

either high or low

• The outside temperature is low

• There are water droplets on the cam-

era

• It is raining or humid

• Foreign matter (mud etc.) is adhering to

the camera

• There are scratches on the camera

• Sunlight or headlights are shining

directly into the camera

• The  vehicle  is  under fluorescent lights,

sodium lights, mercury lights etc.

If this happens due to these causes, it

does not indicate a malfunction.

Back up while visually checking the vehi-

cle’s surroundings. (Use the monitor

again once conditions have been

improved.)

The image on the Lexus parking assist

monitor system screen can be adjusted.

(Vehicles with a Lexus Display Audio sys-

tem: 

P. 329) (Vehicles with a naviga-

tion system: 

“NAVIGATION SYSTEM

OWNER’S MANUAL”.)

 The image is blurry

Dirt or foreign matter (such as water

droplets, snow, mud etc.) is adhering to

the camera.

Flush the camera with a large quantity of

water and wipe the camera lens clean

with a soft and wet cloth.

 The image is out of alignment

The camera or surrounding area has

received a strong impact.

Have the vehicle inspected by your Lexus

dealer.

 The guide lines are very far out of alignment

The camera position is out of alignment.

Have the vehicle inspected by your Lexus

dealer.

• The vehicle is tilted (there is a heavy

load on the vehicle, tire pressure is low

due to a tire puncture, etc.)

• The vehicle is used on an incline.

If this happens due to these causes, it

does not indicate a malfunction.

Back up while visually checking the vehi-

cle’s surroundings.

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 The estimated course lines move even though the steering wheel is straight

There is a malfunction in the signals being

output by the steering sensor.

Have the vehicle inspected by your Lexus

dealer.

 Guide lines are not displayed

The trunk is open.

Close the trunk.

If this does not resolve the symptom, have

the vehicle inspected by your Lexus

dealer.

 The estimated course lines are not displayed

• The steering wheel has been moved

while the battery was being reinstalled.

• Battery power is low.

• The steering sensor has been rein-

stalled.

• There is a malfunction in the signals

being output by the steering sensor.

Stop the vehicle, and turn the steering

wheel as far as it will go to the left and

right.

If this does not resolve the symptom, have

the vehicle inspected by your Lexus

dealer.

Likely cause

Solution

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WARNING

■

When using the Lexus parking assist monitor system
The parking assist monitor is a supplemental device intended to assist the driver when

backing up. When backing up, be sure to check visually behind and all around the vehi-

cle before proceeding.
Observe the following precautions to avoid an accident that could result in death or

serious injuries.

●

Never depend on the parking assist monitor entirely when backing up. The image

and the position of the guide lines displayed on the screen may differ from the actual

state.
Use caution, just as you would when backing up any vehicle.

●

Be sure to back up slowly, depressing the brake pedal to control vehicle speed.

●

If you seem likely to hit nearby vehicles, obstacles, people or mount the shoulder,

depress the brake pedal to stop the vehicle.

●

The instructions given are only guidelines.
When and how much to turn the steering wheel will vary according to traffic condi-

tions, road surface conditions, vehicle condition, etc. when parking. It is necessary to

be fully aware of this before using the parking assist system.

●

When parking, be sure to check that the parking space will accommodate your vehi-

cle before maneuvering into it.

●

Do not use the parking assist monitor in the following cases:
• On icy or slick road surfaces, or in snow

• When using tire chains or emergency tires

• When the trunk is not closed completely

• On roads that are not flat or straight, such as curves or slopes.

●

In low temperatures, the screen may darken or the image may become faint. The

image could distort when the vehicle is moving, or you may become unable to see the

image on the screen. Be sure to check direct visually and with the mirrors all around

the vehicle before proceeding.

●

If the tire sizes are changed, the position of the guide lines displayed on the screen

may change.

●

The camera uses a special lens. The distances between objects and pedestrians that

appear in the image displayed on the screen will differ from the actual distances. 

(

P. 277)

●

Estimated course line display mode: If the steering wheel is straight and the vehicle

width guide lines and the estimated course lines are not in alignment, have the vehicle

inspected by your Lexus dealer.

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NOTICE

■

How to use the camera

●

The parking assist monitor may not operate properly in the following cases.
• If the back of the vehicle is hit, the position and mounting angle of the camera may

change.

• As the camera has a water proof construction, do not detach, disassemble or

modify it. This may cause incorrect operating.

• When cleaning the camera lens, flush the camera with a large quantity of water

and wipe it with a soft and wet cloth. Strongly rubbing the camera lens may cause

the camera lens to be scratched and unable to transmit a clear image.

• Do not allow organic solvent, car wax, window cleaner or glass coat to adhere to

the camera. If this happens, wipe it off as soon as possible.

• If the temperature changes rapidly, such as when hot water is poured on the vehi-

cle in cold weather, the system may not operate normally.

• When washing the vehicle, do not apply intensive bursts of water to the camera or

camera area. Doing so may result in the camera malfunctioning.

• When the camera is used under fluorescent lights, sodium light or mercury light

etc., the lights and the illuminated areas may appear to flicker.

●

Do not expose the camera to strong impact as this could cause a malfunction.

If this happens, have the vehicle inspected by your Lexus dealer as soon as possible.

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The Blind Spot Monitor is a system that has 2 functions:

●

The BSM (Blind Spot Monitor) function
Assists the driver in making a decision when changing lanes

●

The RCTA (Rear Cross Traffic Alert) function
Assists the driver when backing up

These functions use same sensors.

BSM (Blind Spot Monitor)





: If equipped

Summary of the Blind Spot Monitor

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BSM main switch

Pressing the switch turns the system on or  off.  When  the  switch  is  set  to  on,  the

switch’s indicator illuminates and the buzzer sounds. Common switch for BSM func-

tion and RCTA function.

Outside rear view mirror indicators

BSM function: 

When a vehicle is detected in the blind spot, the outside rear view mirror indicator

comes on while the turn signal lever is not operated. If the turn signal lever is oper-

ated toward the detected side, the outside rear view mirror indicator flashes.
RCTA function: 

When a vehicle approaching from the right or left at the rear of the vehicle is

detected, both outside rear view mirror indicators will flash.

RCTA buzzer (RCTA function)

If a vehicle approaching from the right or left at the rear of the vehicle is detected, a

buzzer will sound. The buzzer also sounds for approximately 1 second immediately

after the BSM function is operated to turn the system on.

Monitor screen display (RCTA function) 

If a vehicle approaching from the right or left at the rear of the vehicle is detected, the

RCTA icon (

P. 293) for the detected side will be displayed on the monitor screen. 

This illustration shows an example of a vehicle approaching from the left at the rear of

the vehicle.

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Outside rear view mirror indicator visibility
In strong sunlight, the outside rear view mirror indicator may be difficult to see.

■

Hearing the RCTA buzzer
The RCTA buzzer may be difficult to hear over loud noises, such as if the audio system

volume is high.

■

When there is a malfunction in the Blind Spot Monitor
If a system malfunction is detected due to any of the following, a warning message will be

displayed: (

P. 532)

●

A sensor is malfunctioning

●

A sensor is dirty or covered with snow or a sticker

●

The outside temperature is extremely high or low

●

Sensor voltage is abnormal

●

A sensor is misaligned

■

Certification for the Blind Spot Monitor

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WARNING

■

Handling the radar sensor
Blind Spot Monitor sensors are installed behind the left and right sides of the rear

bumper respectively. Observe the following to ensure the Blind Spot Monitor can

function correctly.

●

Do not subject a sensor or its surrounding area on the rear bumper to a strong

impact. 

If a sensor is moved even slightly off position, the system may malfunction and vehi-

cles may not be detected correctly. 

In the following situations, have your vehicle inspected by your Lexus dealer.
• 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 attach stickers to the sensor or surrounding area on the rear bumper.

●

Do not modify the sensor or surrounding area on the rear bumper.

●

Do not paint the rear bumper any color other than an official Lexus color.

●

Keep the sensors and the surrounding areas

on the rear bumper clean at all times. 

If a sensor or its surrounding area on the rear

bumper is dirty or covered with snow, the

Blind Spot Monitor may not operate and a

warning message (

P. 543) will be dis-

played. In this situation, clear off the dirt or

snow and drive the vehicle with the operation

conditions of the BSM function (

P. 291) sat-

isfied for approximately 10 minutes. If the

warning message does not disappear, have

the vehicle inspected by your Lexus dealer.

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The BSM function uses radar sensors to detect vehicles that are traveling in an
adjacent lane in the area that is not reflected in the outside rear view mirror (the
blind spot), and advises the driver of the vehicles existence via the outside rear
view mirror indicator.

The areas that vehicles can be detected in are outlined below.
The range of each detection area is:

Approximately 1.6 ft. (0.5 m) to 11.5
ft. (3.5 m) from either side of the
vehicle

*

*

: The area between the side of the vehicle

and 1.6 ft. (0.5 m) from the side of the
vehicle cannot be detected.

Approximately 9.8 ft. (3 m) from the
rear bumper
Approximately 3.3 ft. (1 m) forward
of the rear bumper

BSM function

BSM function detection areas

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2

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WARNING

■

Cautions regarding the use of the function
The driver is solely responsible for safe driving. Always drive safely, taking care to

observe your surroundings.
The BSM function is a supplementary 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 BSM function. As the function cannot judge if it is

safe to change lanes, over reliance could lead to an accident resulting in death or seri-

ous injury.
As the system may not function correctly under certain conditions, the driver’s own

visual confirmation of safety is necessary.

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The BSM function is operational when
The BSM function is operational when all of the following conditions are met:

●

The BSM function is on.

●

The shift lever is in a position other than R.

●

The vehicle speed is greater than approximately 10 mph (16 km/h).

■

The BSM function will detect a vehicle when
The BSM function will detect a vehicle present in the detection area in the following situ-

ations:

●

A vehicle in an adjacent lane overtakes your vehicle.

●

You overtake a vehicle in an adjacent lane slowly.

●

Another vehicle enters the detection area when it changes lanes.

■

Conditions under which the BSM function will not detect a vehicle
The BSM function is not designed to detect the following types of vehicles and/or

objects:

●

Small motorcycles, bicycles, pedestrians, etc.

*

●

Vehicles traveling in the opposite direction

●

Guardrails, walls, signs, parked vehicles and similar stationary objects

*

●

Following vehicles that are in the same lane

*

●

Vehicles traveling 2 lanes away from your vehicle

*

●

Vehicles which are being overtaken rapidly by your vehicle

*

*

: Depending on the conditions, detection of a vehicle and/or object may occur.

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Conditions under which the BSM function may not function correctly

●

The BSM function may not detect vehicles correctly in the following situations:
• When the sensor is misaligned due to a strong impact to the sensor or its surround-

ing area

• When mud, snow, ice, a sticker, etc. is covering the sensor or surrounding area on

the rear bumper

• When driving on a road surface that is wet with standing water during bad weather,

such as heavy rain, snow, or fog

• When multiple vehicles are approaching with only a small gap between each vehicle

• When the distance between your vehicle and a following vehicle is short

• When there is a significant difference in speed between your vehicle and the vehicle

that enters the detection area

• When the difference in speed between your vehicle and another vehicle is changing

• When a vehicle enters a detection area traveling at about the same speed as your

vehicle

• As your vehicle starts from a stop, a vehicle remains in the detection area

• When driving up and down consecutive steep inclines, such as hills, dips in the road,

etc.

• When driving on roads with sharp bends, consecutive curves, or uneven surfaces

• When vehicle lanes are wide, or when driving on the edge of a lane, and the vehicle

in an adjacent lane is far away from your vehicle

• When items such as a bicycle carrier are installed on the rear of the vehicle

• When there is a significant difference in height between your vehicle and the vehicle

that enters the detection area

• Immediately after the BSM function is turned on

●

Instances of the BSM function unnecessarily detecting a vehicle and/or object may

increase in the following situations:
• When the sensor is misaligned due to a strong impact to the sensor or its surround-

ing area

• When the distance between your vehicle and a guardrail, wall, etc. that enters the

detection area is short

• When driving up and down consecutive steep inclines, such as hills, dips in the road,

etc.

• When vehicle lanes are narrow, or when driving on the edge of a lane, and a vehicle

traveling in a lane other than the adjacent lanes enters the detection area

• When driving on roads with sharp bends, consecutive curves, or uneven surfaces

• When the tires are slipping or spinning

• When the distance between your vehicle and a following vehicle is short

• When a bicycle carrier or other accessory is installed to the rear of the vehicle

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The RCTA function uses radar sensors to detect vehicles approaching from the
right or left at the rear of the vehicle and alerts the driver of the presence of such
vehicles by flashing the outside rear view mirror indicators and sounding a
buzzer.

Approaching vehicles
Detection areas of approaching vehicles

RCTA function

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RCTA icon display 
When a vehicle approaching from the right or left at the rear of the vehicle is
detected, the following will be displayed on the audio system screen.

Display

Content

A vehicle is approaching from the left at the rear of the vehicle

A vehicle is approaching from the right at the rear of the vehicle

Vehicles are approaching from both sides of the vehicle

The RCTA function is malfunctioning (

P. 287)

WARNING

■

Cautions regarding the use of the function
The driver is solely responsible for safe driving. Always drive safely, taking care to

observe your surroundings.
The RCTA function is only a supplementary function which alerts the driver that a vehi-

cle is approaching from the right or left at the rear of the vehicle. As the RCTA function

may not function correctly under certain conditions, the driver’s own visual confirma-

tion of safety is necessary. Over reliance on this function may lead to an accident

resulting in death or serious injury.

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The areas that vehicles can be detected in are outlined below.

The buzzer can alert the driver of faster vehicles approaching from farther away.
Example:

■

The RCTA function is operational when
The RCTA function operates when all of the following conditions are met:

●

The BSM function is on.

●

The shift lever is in R.

●

The vehicle speed is less than approximately 5 mph (8 km/h).

●

The approaching vehicle speed is between approximately 5 mph (8 km/h) and 18 mph

(28 km/h).

RCTA function detection areas

Approaching vehicle

Speed

Approximate 

alert distance

Fast

18 mph (28 km/h)

65 ft. (20 m)

Slow

5 mph (8 km/h)

18 ft. (5.5 m)

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Conditions under which the RCTA function will not detect a vehicle
The RCTA function is not designed to detect the following types of vehicles and/or

objects:

●

Vehicles approaching from directly behind

●

Vehicles backing up in a parking space next to your vehicle

●

Guardrails, walls, signs, parked vehicles and similar stationary objects

*

●

Small motorcycles, bicycles, pedestrians, etc.

*

●

Vehicles moving away from your vehicle

●

Vehicles approaching from the parking spaces next to your vehicle

*

*

: Depending on the conditions, detection of a vehicle and/or object may occur.

■

Conditions under which the RCTA function may not function correctly

●

The RCTA function may not detect vehicles correctly in the following situations:
• When the sensor is misaligned due to a strong impact to the sensor or its surround-

ing area

• When mud, snow, ice, a sticker, etc. is covering the sensor or surrounding area on

the rear bumper

• When driving on a road surface that is wet with standing water during bad weather,

such as heavy rain, snow, or fog

• When multiple vehicles are approaching with only a small gap between each vehicle

• When a vehicle is approaching at high speed

●

Vehicles that the sensors cannot detect due to

obstructions

• When backing up on a slope with a sharp

change in grade