sensor Lexus ES300h 2018 (OM33D45U) Service Manual

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Driving
NOTICE
■When using intuitive parking assist-sensor
In the following situations, the system may not function correctly due to a sensor mal-
function etc. Have the vehicle checked by your Lexus dealer.
●The intuitive parking assist operation display flashes, and a beep sounds when no
obstacles are detected.
●If the area around a sensor co llides with something, or is subjected to strong impact.
●If the bumper collides with something.
●If the display shows continuously without a beep.
●If a display error occurs, first check the sensor.
If the error occurs even if there is no ice, sn ow or mud on the sensor, it is likely that the
sensor is malfunctioning.
■Notes when washing the vehicle
Do not apply intensive bursts of water or steam to the sensor area.
Doing so may result in th e sensor malfunctioning.

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Driving
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.
 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
• 12-volt 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 causeSolution

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ES300h_OM_OM33D45U_(U)4-5. Using the driving support systems
BSM (Blind Spot Monitor)∗
The Blind Spot Monitor is a system that has 2 functions;
●The Blind Spot Monitor function
Assists the driver in making th
e decision when changing lanes
●The Rear Cross Traffic Alert function
Assists the driver when backing up
These functions use same sensors.
BSM main switch
Pressing the switch turns the system on or of f. When the switch is set to on, the switch’s
indicator illuminates. Common switch fo r Blind Spot Monitor function and Rear
Cross Traffic Alert function.
Outside rear view mirror indicator
Blind Spot Monitor function:
When a vehicle is detected in the blind sp ot, the outside rear view mirror indicator
comes on while the turn signal lever is not operated. If the turn signal lever is operated
toward the detected side, the outsid e rear view mirror indicator flashes.
Rear Cross Traffic Alert function:
When a vehicle approaching from the right or left rear of the vehicle is detected, the
outside rear view mi rror indicators flash.
Rear Cross Traffic Alert buzzer (Rea r Cross Traffic Alert function only)
When a vehicle approaching from the right or left rear of the vehicle is detected, a
buzzer sounds from behind the rear seat.
∗: If equipped
Summary of the Blind Spot Monitor
1
2
3

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■The outside rear view mirror indicators visibility
When under strong sunlight, the outside rear view mirror indicator may be difficult to
see.
■Rear Cross Traffic Alert buzzer hearing
Rear Cross Traffic Alert function may be diffic ult to hear over loud noises such as high
audio volume.
■When “Blind Spot Monitor Unavailable” is shown on the multi-information display
Water, snow mud, etc., may be built up in the vicinity of the sensor area of bumper.
( → P. 266) Removing the water, snow, mud, etc., from the vicinity of the sensor area
bumper should return it to normal. Also, the sensor may not function normally when
used in extremely hot or cold weather.
■When “Blind Spot Monitor System Malfunct ion Visit Your Dealer” is shown on the
multi-information display
There may be a sensor malfunction or voltage abnormality. Have the vehicle inspected at
a Lexus dealer.
■Certification for the B lind Spot Monitor system
For vehicles sold in the U.S.A.
For vehicles sold in Canada

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ES300h_OM_OM33D45U_(U)4-5. Using the driving support systems
WARNING
■Handling the radar sensor
One Blind Spot Monitor sensor is installed in
side the left and right side of the vehicle
rear bumper respectively. Observe the following to ensure the Blind Spot Monitor sys-
tem can function correctly.
●Do not subject the sensor or surrounding area on the bumper to a strong impact. If
the sensor moves even slight ly off position, the system may malfunction and vehicles
that enter the detection area may not be detected. If the sensor or surrounding area is
subject to a strong impact, always have the area inspected by your Lexus dealer.
●Do not disassemble the sensor.
●Do not attach accessories or stickers to the sensor or surrounding area on the
bumper.
●Do not modify the sensor or su rrounding area on the bumper.
●Do not paint the rear bumper any colo r other than an official Lexus color.
●Keep the sensor and its surrounding area on
the bumper clean at all times.

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The Blind Spot Monitor 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 the detection area
extends to:
Approximately 11.5 ft. (3.5 m) from
the side of the vehicle
The first 1.6 ft. (0.5 m) from the side of
the vehicle is not in the detection area
Approximately 9.8 ft. (3 m) from the
rear bumper
Approximately 3.3 ft. (1 m) forward
of the rear bumper
The Blind Spot Monitor function
The Blind Spot Monitor function detection areas
1
2
3
WARNING
■Cautions regarding the use of the system
The driver is solely responsible for safe driving. Always drive safely, taking care to
observe your surroundings.
The Blind Spot Monitor function is a supp lementary function which alerts the driver
that a vehicle is present in the blind spot. Do not overly rely on the Blind Spot Monitor
function. The function cannot judg e if it is safe to change lanes, therefore over reliance
could cause an accident resultin g in death or serious injury.
According to conditions, the system does have operational limitations. Therefore the
driver’s own visual confirmation of safety is necessary.

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The Rear Cross Traffic Alert functions when your vehicle is in reverse. It can
detect other vehicles approaching from the right or left rear of the vehicle. It uses
radar sensors to alert the driver of the other vehicle’s existence through flashing
the outside rear view mirror indicators and sounding a buzzer.
The Rear Cross Traffic Alert function
Approaching vehicles Detection areas12
WARNING
■Cautions regarding the use of the system
The driver is solely responsible for safe driving. Always drive safely, taking care to
observe your surroundings.
The Rear Cross Traffic Alert function is only an assist and is not a replacement for care-
ful driving. Driver must be careful when ba cking up, even when using Rear Cross Traffic
Alert function. The driver’s own visual conf irmation of behind you and your vehicle is
necessary and be sure there are no pedestrians, other vehicles etc. before backing up.
Failure to do so could caus e death or serious injury.
According to conditio ns, the system may not function correctly. Therefore the driver’s
own visual confirmation of safety is necessary.

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Driving
■Conditions under which the Rear Cross Traffic Alert function will not detect a vehicle
The Rear Cross Traffic Alert function is no t designed to detect the following types of
vehicles and/or objects.
●Small motorcycles, bicycles, pedestrians etc.*
●Vehicles approaching from directly behind
●Guardrails, walls, signs, parked vehi cles and similar stationary objects*
●Vehicles moving away from your vehicle
●Vehicles approaching from the parking spaces next to your vehicle*
●Vehicles backing up in the parking space next to your vehicle*
*
: Depending on conditions, detection of a vehicle and/or object may occur.
■Conditions under which the Re ar Cross Traffic Alert function may not function cor-
rectly
The Rear Cross Traffic Alert function may no t detect vehicles correctly in the following
conditions:
●When ice or mud etc. is attached to the rear bumper
●During bad weather such as heavy rain, fog, snow etc.
●When multiple vehicles approach continuously
●Shallow angle parking
●When a vehicle is approaching at high speed
●When parking on a steep incline, su ch as hills, a dip in the road etc.
●Directly after the BSM main switch is set to on
●Vehicles that the sensors cannot detect
because of obstacles

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3916-1. Using the air conditioning system and defogger
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Interior features
■Fogging up of the windows
●The windows will easily fog up when the humi dity in the vehicle is high. Selecting “A/C”
on the option control screen will dehumidify the air from the outlets and defog the
windshield effectively.
●If you turn “A/C” off, the windows may fog up more easily.
●The windows may fog up if the recirculated air mode is used.
■Windshield fog detection function
When automatic mode is set, the humidity sensor ( →P. 393) detects fog on the wind-
shield and controls the air cond itioning system to prevent fog.
■Outside/recirculated air mode
●When driving on dusty roads, in tunnels, or in heavy traffic, set to the
recirculated air mode. This is effective in preventing outside air from entering the vehi-
cle interior. During cooling operation, settin g the recirculated air mode will also cool
the vehicle interior effectively.
●Outside/recirculated air mode may automa tically switch depending on the tempera-
ture setting or the inside temperature.
■When the outside temperature is low
The dehumidification function may not operate even when “A/C” on the option control
screen is selected.
■Automatic mode for air intake control
In automatic mode, the system detects exhaust gas and other pollutants and automati-
cally switches between outside air and recirculated air modes.
When the dehumidification function is off, and the fan is operating, turning automatic
mode on will activate the dehumidification function.
■Micro dust and pollen filter
●In order to prevent the windshield from fogging up when the outside air is cold, the fol-
lowing may occur:
• Outside air mode does not switch to (recirculated air) mode.
• The dehumidification function operates.
• The operation cancels after approximately 1 minute.
●In rainy weather, the windows may fog up. Press .
●In extremely humid weather, the windows may fog up.
●The pollen is filtered out ev en if the micro dust and pollen filter is turned off.
■Operation of the air conditioning system in Eco drive mode
●In the Eco drive mode, the air conditioning sy stem is controlled as follows to prioritize
fuel efficiency
• Engine speed and compressor operation controlled to restrict heating/cooling
capacity
• Fan speed restricted when automatic mode is selected
●To improve air conditioning performa nce, perform the following operations
• Adjust the fan speed
• Turn off Eco drive mode

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Interior features
NOTICE
■Humidity sensor
●Do not stick anything on the sensor
■To prevent 12-volt battery discharge
Do not leave the air conditioning system on longer than necessary when the hybrid sys-
tem is off.
In order to detect fog on the windshield, a sen-
sor which monitors the temperature of the
windshield, the surround humidity, etc. is
installed. ( →P. 391)
Follow these points to avoid damaging the sen-
sor:
●Do not disassemble the sensor
●Do not spray the glass cleaner on the sensor
or subject it to strong impacts