brake LEXUS RX200T 2017 Repair Manual

3504-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
●In the following situations, the engine may restart automatically if the engine is stopped
by the Stop & Start system. (To enable stoppi ng of the engine by the Stop & Start sys-
tem, drive the vehicle.)
• The brake pedal is pumped or strongly depressed.
• The air conditioning system is being used.
• The battery is not sufficiently charged.
■Hood
●If the hood is opened while the engine is stopped by the Stop & Start system, the engine
will stall and will not be able to be restarte d by the automatic engine start function. In
this case, restart the engine using the normal engine starting procedure. (P. 246)
●If the hood is closed after the engine is st arted with the hood open, the Stop & Start sys-
tem will not operate. Close the hood, turn the engine switch off, wait 30 seconds or
more, and then start the engine.
■When to use the Stop & Start system
●When the system cannot operate, is cancele d, or is malfunctioning, warning messages
and a warning buzzer are used to inform the driver. ( P. 352)
●If the engine switch is pressed when the en gine is stopped by the Stop & Start system,
the engine will stall and will not be able to be restarted by the automatic engine start
function. In this case, restart the engine using the normal engine starting procedure.
(  P. 246)
●When the engine is restarted by the Stop & Start system, the power outlets may be
temporarily unusable, but this is not a malfunction.
●Installation and remova l of electrical components and wireless devices may affect the
Stop & Start system. Contact any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional for details.
■If the windshield is fogged up while the engine is stopped by the Stop & Start system
Turn on. ( P. 542)
If the windshield fogs up frequently, press the Stop & Start cancel switch to disable the
system.
■If an odor comes from the air conditioning system while the engine is stopped by the
Stop & Start system
Press the Stop & Start cancel switch to deactivate the Stop & Start system.

3524-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
■Multi-information display messages
If the following situations, and a message may be displayed on the multi-information
display.
●When the engine cannot be stopped by the Stop & Start system
MessageDetails
“Depress Brake
Firmly to Activate”
The brake pedal is not depressed enough.
If the brake pedal is depressed further, the system
will operate.
“For Climate Control”
• The air conditioning system is being used when the ambient temperature is high or low.
If the difference between the set temperature and
cabin temperature is small, the system will be
enabled.
• is ON.
“Battery Charging”
• The battery charge amount may be low. Engine stop is temporarily prohibited to prioritize
charging of the battery, but if the engine is operated
for a short while, engine stop is allowed.
• A refresh charge may be occurring, such as when the battery is undergoing a periodic recharge, for a
while after the battery terminals have been discon-
nected and reconnected, for a while after the bat-
tery has been replaced, etc.
After a refresh charge of approximately 5 to 60 min-
utes completes, the system can be operated.
• If the message is displayed continuously (more than 60 minutes), the battery may be deteriorated. Con-
tact any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional for
details.
“For Brake System”
• The vehicle is being driven in a high altitude area.
• The brake booster vacuum is low. When the brake booster vacuum reaches a prede-
termined level, the system will be enabled.
“Steering Wheel
Turned”
The steering wheel has been operated.
“Driver Seat Belt
Unbuckled”
The driver seat belt is not fastened.
“Stop & Start Unavail-
able”
• The Stop & Start system is temporarily disabled. Operate the engine for a short while.
• The engine may have been started with the hood open.
Close the hood, turn the engine switch off, wait for
30 seconds or more, and then start the engine.

3534-5. Using the driving support systems
4
Driving
RX350/RX200t_EE_OM48F32E
●When the engine automatically restarts while stopped by the Stop & Start system
■If “Stop & Start System Malfunction Visit Your Dealer” is displayed on the multi-infor-
mation display
The system may be malfunctioning. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
■If the Stop & Start cancel indicator continues to flash
The system may be malfunctioning. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
“System Temperature
Low”
The battery may be cold. Operate the engine for a short while allows the sys-
tem to recover due to the temperature increase in
the engine compartment.
“System Temperature
High”
The battery may be extremely hot. If the engine compartment is allowed to cool suffi-
ciently, the system will recover.
“Non-Dedicated Bat-
tery”
A non-dedicated battery for the Stop & Start system
may have been installed. The Stop & Start system does not operate. Have the
vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped pro-
fessional.
MessageDetails
MessageDetails
“For Climate Control”
• The air conditioning system has been turned on or is being used.
• has been turned on.
“For Brake System”
The brake pedal has been depressed further or
pumped. The system will be enabled after the engine runs and
the brake booster vacuum reaches a predetermined
level.
“Battery Charging”
The battery charge may have become low. The engine is restarted to prioritize battery charging.
Operating the engine for a short while allows the
system to recover.
“Steering Wheel
Turned”
The steering wheel was operated.
“Driver Seat Belt
Unbuckled”
The driver seat belt has been unfastened.

3544-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
WARNING
■When the Stop & Start system is operating
●Depress the brake pedal and apply the parking brake when necessary while the engine is stopped by the Stop & Start system (while the Stop & Start indicator is on).
(Except when the brake hold system is operating or when the vehicle comes to a con- trolled stop while driving with the dynamic radar cruise control with full-speed range in vehicle-to-vehicle distan ce control mode [if equipped])
●Do not allow anyone to leave the vehicle while the engine is stopped by the Stop & Start system (while the Stop & Start indicator is on).An accident may occur due to the automatic engine start function.
●Ensure that the engine is not stopped by the Stop & Start system while the vehicle is ina poorly ventilated area. The engine may restart due to the automatic engine startfunction, causing exhaust gases to collect and enter the vehicle, possibly resulting in
death or a serious health hazard.
NOTICE
■To ensure the system operates correctly
If any of the following situations occur, the Stop & Start system may not operate cor- rectly. Have your vehicle inspected by any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.
●While the driver's seat belt is fastened, the driver's and front passenger's seat belt reminder light flashes.
●Even though the driver's seat belt is not fastened, the driver's and front passenger'sseat belt reminder light does not illuminate.
●Even though the driver's door is closed, the open door warning is displayed on the
multi-information display or the interior lig ht is illuminated when door linked illumina- tion is enabled ( P. 553).
●Even though the driver's door is open, the open door warning is not displayed on the
multi-information display or the interior light does not illuminate when door linked illumination is enabled ( P. 553).

3654-5. Using the driving support systems
4
Driving
RX350/RX200t_EE_OM48F32E
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
■Rear Crossing Traffic Auto Brake function (if equipped)
When the Intelligent Clearance Sonar with Rear Crossing Traffic Auto Brake
is enabled and a vehicle approaching from the right or left at the rear of the
vehicle is detected, the Rear Crossing Tr affic Auto Brake function will perform
brake control to reduce the likelihood of an impact with the approaching vehi-
cle.
Intelligent Clearance Sonar with Rear Crossing Traffic Auto Brake: P. 380
RCTA function
1
2

3774-5. Using the driving support systems
4
Driving
RX350/RX200t_EE_OM48F32E
■The Lexus parking assist-sensor can be operated when
●Front corner sensors:
• The engine switch is in IGNITION ON mode. • The shift lever is in other than P.
• The vehicle speed is less than about 10 km/h (6 mph). (At any speed when the shift lever is in R)
●Front center sensors:
• The engine switch is in IGNITION ON mode. • The shift lever is in other than P or R.
• The vehicle speed is less than about 10 km/h (6 mph).
●Rear corner and rear center sensors:
• The engine switch is in IGNITION ON mode. • The shift lever is in R.
■Lexus parking assist-sensor display
●Vehicles with a Lexus Display Audio system : When an obstacle is detected while the Lexus parking assist monitor is in use, the warning indicator will appear in the upperpart of the screen even if the display setting has been set to off.
●Vehicles with a navigation system: If the Lexu s parking assist-sensor display is set to on, detected objects will also be displayed on the panoramic view monitor. For details, refer to “NAVIGATION SYSTEM OWNER’S MANUAL”.
■Sensor detection information
●The sensor’s detection areas are limited to the areas around the vehicle’s bumper.
●Certain vehicle conditions and the surrounding environment may affect the ability of a
sensor to correctly detect an obstacle. Particular instances where this may occur are listed below.
• There is dirt, snow or ice on the sensor . (Wiping the sensors will resolve this prob-
lem.) • The sensor is frozen. (Thawing the area will resolve this problem.) In especially cold weather, if a sensor is frozen the screen may show an abnormal
display, or obstacles may not be detected. • The sensor is covered in any way.• The vehicle is leaning considerably to one side.
• On an extremely bumpy road, on an incline, on gravel, or on grass. • The vicinity of the vehicle is noisy due to vehicle horns, motorcycle engines, airbrakes of large vehicles, or other loud noises producing ultrasonic waves.
• There is another vehicle equipped with parking assist sensors in the vicinity. • The sensor is coated with a sheet of spray or heavy rain. • The vehicle is equipped with a fender pole or wireless antenna.
• Towing eyelets are installed. • The bumper or sensor receives a strong impact.
• The vehicle is approaching a tall or curved curb. • In harsh sunlight or intense cold weather.• The area directly under the bumpers is not detected.
• If obstacles draw too close to the sensor. • A non-genuine Lexus suspension (low ered suspension etc.) is installed. • People may not be detected if they are wearing certain types of clothing.
In addition to the examples above, there are instances in which, because of their shape, signs and other objects may be judged by a sensor to be closer than they are.

3784-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
●The shape of the obstacle may prevent a sensor from detecting it. Pay particular atten- tion to the following obstacles:
• Wires, fences, ropes, etc.
• Cotton, snow and other materials that absorb sound waves • Sharply-angled objects• Low obstacles
• Tall obstacles with upper sections projecting outwards in the direction of your vehi- cle
●The following situations may occur during use.
• Depending on the shape of the obstacle and other factors, the detection distance may shorten, or detection may be impossible.
• Obstacles may not be detected if they are too close to the sensor. • There will be a short delay between obst acle detection and display. Even at slow speeds, there is a possibility that the obstacl e will come within the sensor’s detection
areas before the display is shown and the buzzer sounds. • Thin posts or objects lower than the sens or may not be detected when approached, even if they have been detected once.
• It might be difficult to hear beeps due to the volume of audio system or air flow noise of the air conditioning system.
■If “Clean Parking Assist Sensor” is di splayed on the multi-information display
A sensor may be dirty or covered with snow or ice. In such cases, if it is removed from the sensor, the system should return to normal. Also, due to the sensor being frozen at low temperatures, a malfunction display may
appear or an obstacle may not be detected. If the sensor thaws out, the system should return to normal.
■If “Parking Assist Malfun ction” is displayed on the multi-information display
Depending on the malfunction of the sensor , the device may not be working normally. Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional.
■Customization
Some functions can be customized. ( P. 376,740)
WARNING
■When using the Lexus parking assist-sensor
Observe the following precautions.
Failing to do so may result in the vehicle be ing unable to be driven safely and possibly cause an accident.
●Do not use the sensor at speeds in excess of 10 km/h (6 mph).
●The sensors’ detection areas and reaction times are limited. When moving forward or reversing, check the areas surrounding the vehicle (especially the sides of the vehi-cle) for safety, and drive slowly, using the brake to control the vehicle’s speed.
●Do not install accessories within the sensors’ detection areas.

3804-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
The system will operate in situations such as the following if an object is detected
in the traveling direction of the vehicle.
◆When traveling at a low speed and the brake pedal is not depressed, or is
depressed late
: If equipped
Intelligent Clearance Sonar (ICS) 
If a collision with an object may occur due to the vehicle suddenly moving for-
ward due to an accidental accelerato r pedal operation, the vehicle moving
the unintended direction due to the wrong shift position being selected, or
while parking or traveling at low speeds, the sensors detect objects, such a
wall, in the traveling direction of the ve hicle, and the system operates to lessen
an impact with an object and reduce the resulting damage.
Examples of system operation

3824-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
If a radar sensor detects a vehicle approaching from the right or left at the rear of
the vehicle and a collision may occur, this function will perform brake control to
reduce the likelihood of an impact with the approaching vehicle.
■Examples of system operation
The system will operate in situations such as the following if an object is
detected in the traveling direction of the vehicle.
◆When reversing, a vehicle is approaching and the brake pedal is not
depressed, or is depressed late
Rear Crossing Traffic Auto Brake function (if equipped)

3844-5. Using the driving support systems
RX350/RX200t_EE_OM48F32E
If the engine output restriction control or brake control operates, a buzzer will
sound and a message will be displayed on the multi-information display to alert
the driver.
Depending on the situation, engine output restriction control will operate to either limit acceleration or restrict output as much as possible.
Displays and buzzers for engine output restriction control and brake
control
ControlSituationMulti-information displayICS OFF IndicatorBuzzer
Engine output
restriction control is operating (acceler-ation restriction)
Acceleration
greater than a cer- tain amount is not possible.
“Object DetectedAcceleration
Reduced”
Not illu- minated
Shortbeep
Engine output
restriction control is operating (output restricted as much
as possible)
Stronger-than-nor- mal brake opera-tion is necessary.“BRAKE!”
Brake control is operatingEmergency brak-ing is necessary.
Vehicle stopped by
system operation
The vehicle has been stopped by
brake control oper- ation.
“Switch to Brake”Illumi-
nated