sensor LEXUS RX300H 2017 Repair Manual

3294-5. Using the driving support systems
4
Driving
RC300h_EE(OM24740E)
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
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 fu nction which alerts the driver that a vehi- cle is approaching from the right or left at th e 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 death or serious injury.
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3314-5. Using the driving support systems
4
Driving
RC300h_EE(OM24740E)
■Conditions under which the RCTA function will not detect a vehicle
The RCTA function is not designed to dete ct 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 vehi cles 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.
●Vehicles that the sensors cannot detect due to obstructions

3324-5. Using the driving support systems
RC300h_EE(OM24740E)
■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 wi th only a small gap between each vehicle
• When a vehicle is approaching at high speed
• Immediately after the BSM main switch is turned on
• Immediately after the hybrid system is started with the BSM main switch on
• When backing up on a slope with a sharp
change in grade
• When backing out of a shallow angle park- ing spot
• When the sensors cannot detect a vehicle due to obstructions

4346-1. Using the air conditioning system
RC300h_EE(OM24740E)
■Adjusting the temperature setting
To adjust the temperature setting,
touch and slide your finger up or
down on the sensor.
The temperature setting can also be adjusted by touching on the sensor.
When the temperature setting is changed, a buzzer sounds.
■Fan speed setting
Press to increase the fan speed.
Press to decrease the fan speed.
■Change the airflow mode
To change the airflow, press .
The air outlets used are switched
each time the button is pressed.
Air flows to the upper body.
Air flows to the upper body and
feet.
Air flows to the feet.
Air flows to the feet and the wind-
shield defogger operates.
■S-FLOW mode
When there are no passengers in the rear seats, airflow can be directed to the
front seats only to reduce the air conditioning effect on the rear seats.
However, depending on both the temperat ure inside and outside the vehicle, air- flow may be directed to the rear seats even though S-FLOW mode is on to main- tain comfort inside the vehicle.
Press .
The indicator comes on when S-FLOW mode is on.
Press again to resume airflow to the rear seats.
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4627-1. Maintenance and care
RC300h_EE(OM24740E)
WARNING
■When washing the vehicle
Do not apply water to the inside of the engine compartment. Doing so may cause the electrical components etc. to catch fire.
■When cleaning the windshield (vehicles with rain-sensing windshield wipers)
●When the upper part of the windshield where the raindrop sensor is located is touched by hand
●When a wet rag or similar is held close to the raindrop sensor
●If something bumps against the windshield
●If you directly touch the raindrop sensor body or if something bumps into the raindrop
sensor
■Precautions regarding the exhaust pipes
As exhaust gases cause the exhaust pipes to become quite hot, do not touch the
exhaust pipes while the hybrid system is op erating or immediately after the engine is turned off.
When washing the vehicle, be careful not to touch the exhaust pipes until they have
cooled sufficiently, as touching hot exhaust pipes can cause burns.
■Precaution regarding the rear bumper with Blind Spot Monitor (if equipped)
If the paint of the rear bumper is chipped or scratched, the system may malfunction. If
this occurs, consult any authorized Lexus deal er or repairer, or another duly qualified and equipped professional.
Set the wipers to the intermittent windshield
wipers. ( P. 244) If AUTO mode is selected, the wipers mayoperate unexpectedly in the following situa-
tions, and may result in hands being caught or other serious injuries and cause damage to thewiper blades.

4667-1. Maintenance and care
RC300h_EE(OM24740E)
NOTICE
■Cleaning detergents
●Do not use the following liquids, as they may discolor the vehicle interior or cause streaks or damage to painted surfaces:
• Audio system screen: Organic substances such as benzine or gasoline, alkaline solutions, and alcohol• Seats: Alkaline solutions, organic substances such as thinner or benzine, and alco-
hol • Other parts: Organic substances such as benzine or gasoline, alkaline or acidic solutions, dye, and bleach
●Do not use polish wax or polish cleaner. The instrument panel’s or other interior part’s painted surface may be damaged.
■Preventing damage to leather surfaces
Observe the following precautions to avoid damage to and deterioration of leather surfaces:
●Remove any dust or dirt from leather surfaces immediately.
●Do not expose the vehicle to direct sunlight for extended periods of time. Park the vehicle in the shade, especially during summer.
●Do not place items made of vinyl, plastic, or containing wax on the upholstery, as theymay stick to the leather surface if the vehicle interior heats up significantly.
■Water on the floor
Do not wash the vehicle floor with water. Vehicle systems such as the audio system may be damaged if water comes into contactwith electrical components such as the au dio system above or under the floor of the
vehicle. Water may also cause the body to rust.
■When cleaning the inside of the windshield (vehicles with LDA [Lane Departure Alert])
Be careful not to touch the camera sensor ( P. 273). If the camera is accidentally scratched or hit, LDA may not operate properly or maycause a malfunction.
■Cleaning the inside of the rear window
●Do not use glass cleaner to clean the rear window, as this may cause damage to therear window defogger heater wires or antenna. Use a cloth dampened with luke-
warm water to gently wipe the window clean. Wipe the window in strokes running parallel to the heater wires or antenna.
●Be careful not to scratch or damage the heater wires or antenna.

5408-2. Steps to take in an emergency
RC300h_EE(OM24740E)
*1: Open door warning buzzer:
 P. 544
*2: Seat belt warning buzzer:
The seat belt warning buzzer sounds to al ert the driver, front passenger and rear pas- sengers that his or her seat belt is not fastened. The buzzer sounds for 30 seconds
after the vehicle reaches a speed of 20 km/h (12 mph). Then, if the seat belt is still unfastened, the buzzer will sound in a different tone for 90 more seconds.
■Front passenger detection sensor, seat belt reminder and warning buzzer
●If luggage is placed on a front passenger seat, the front passenger detection sensormay cause the warning light to flash and the warning buzzer to sound even if a passen-
ger is not sitting in the seat.
●If a cushion is placed on the seat, the sensor may not detect a passenger, and the warn- ing light may not operate properly.
■If the malfunction indicator lamp comes on while driving
The malfunction indicator lamp will come on if the fuel tank becomes completely empty. If the fuel tank is empty, refuel the vehicle immediately. The malfunction indicator lamp
will go off after several trips.
If the malfunction indicator lamp does not go off, contact any authorized Lexus dealer or repairer, or another duly qualified and eq uipped professional as soon as possible.
■Electric power steering system warning light (warning buzzer)
When the 12-volt battery charge becomes insufficient or the voltage temporarily drops, the electric power steering system warning light may come on and the warning buzzer
may sound.
■When the tire pressure warning light comes on
Carry out the following procedure after the tire temperature has lowered sufficiently.
●Check the tire inflation pressure and adjust to the appropriate level.
●If the warning light does not go out even afte r several minutes, check that the tire infla- tion pressure is at the specifie d level and carry out initialization.
The warning light may come on again if the above operations are conducted without first allowing the tire temperature to lower sufficiently.
■The tire pressure warning light may come on due to natural causes
The tire pressure warning light may come on due to natural causes such as natural air leaks and tire inflation pressure changes caused by temperature. In this case, adjustingthe tire inflation pressure will turn off the warning light (after a few minutes).
■When a tire is replaced with the spare tire (if equipped)
The spare tire is not equipped with a tire pre ssure warning valve and transmitter. If a tire
goes flat, the tire pressure warning light will no t turn off even though the flat tire has been replaced with the spare tire.
■Conditions that the tire pressure warning system may not function properly
P. 489

5458-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
Indicates a malfunction in the Lexus parking assist-sen-
sor A buzzer also sounds. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
Indicates that a Lexus parking assist-sensor is dirty or
covered with ice A buzzer also sounds. Clean the sensor.
Indicates that the accelerator pedal is depressed while the shift position is in NA buzzer also sounds.
 Release the accelerator pedal and shift the shift lever to D, S or R.
Indicates that the accelerator pedal is depressed to stopthe vehicle on an upward slope, etc.
A buzzer also sounds.  Release the accelerator pedal and depress the brake pedal.
Warning messageDetails/Actions
(Flashes)
(Flashes)

5478-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
Indicates that the vehicle is being driven at 5 km/h (3 mph) or more with the parking brake still engaged
A buzzer also sounds.  Release the parking brake.
Indicates a malfunction in: • The SRS airbag system; or• The seat belt pretensioner system
A buzzer also sounds.  Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
Indicates a malfunction in: •The ABS; or• The brake assist system
A buzzer also sounds.  Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
Indicates that the engine coolant temperature is too high
A buzzer also sounds.  P. 587
(If equipped)
Indicates that the radar sensor is dirty or covered with ice
A buzzer also sounds.  Clean the sensor.
Warning messageDetails/Actions
(Flashes)

5488-2. Steps to take in an emergency
RC300h_EE(OM24740E)
(If equipped)
Indicates that the dynamic radar cruise control system is
unable to judge vehicle-to-vehicle distance A buzzer also sounds. Turn off snow mode.
If the windshield wipers are on, turn them off or set them to a mode other than AUTO or high speedwiper operation.
(If equipped)
Indicates that the LDA (Lane Departure Alert) system issuspended (The camera sensor temperature is higher
than the operation temperature range) A buzzer also sounds. Restart the LDA after driving for a while.
(If equipped)
Indicates that a Blind Spot Monitor sensor or the sur- rounding area on the rear bumper is dirty or covered
with snow, ice, etc. or that a sensor is misaligned A buzzer also sounds. Clean off the dirt, snow, ice, etc. and drive the vehi-
cle with the operation conditions of the BSM func- tion ( P. 327) satisfied for approximately 10
minutes. If the warning message does not disappear, the sensor may be misaligned. Have the vehicleinspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
Indicates a malfunction in:• The cruise control system; or
• The dynamic radar cruise control system (if equipped) Press the “ON/OFF” button once to deactivate thesystem, and then press the button again to reactivate
the system. A buzzer also sounds. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
Warning messageDetails/Actions