2014 LEXUS RX270 cruise control

242
2-4. Using other driving systems
RX350/270_EE
■Automatic cancelation of constant speed control
The cruise control will stop maintaining the vehicle speed in the following situations:
●Actual vehicle speed is more than approximately 16 km/h (10 mph) below the
set vehicle speed.
At this time, the memorized set speed is not retained.
●Actual vehicle speed falls below approximately 40 km/h (25 mph).
●VSC is activated.
●VSC+ is activated (if equipped).
■Radar sensor and grille cover
Always keep the sensor and grille cover clean to ensure that the vehicle-to-vehicle
distance control operates properly. (Some obstructions, such as snow, ice and plas-
tic objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
■Warning lights, messages and buzzers for dynamic radar cruise control
Warning lights, messages and buzzers are used to indicate a system malfunction or
to inform the driver of the need for caution while driving. (→P. 5 5 7 ) Grille cover
Radar sensor
RX350_270_EE_48D77E.book 242 ページ ２０１４年１月２４日　金曜日　午前１０時４分

245
2-4. Using other driving systems
2
When driving
RX350/270_EE
CAUTION
■Before using dynamic radar cruise control
Do not overly rely on vehicle-to-vehicle distance control.
Be aware of the set speed. If automatic deceleration/acceleration is not appropri-
ate, adjust the vehicle speed, as well as the distance between your vehicle and vehi-
cles ahead by applying the brakes etc.
■Cautions regarding the driving assist systems
Observe the following precautions.
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 determin-
ing 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
appropriate or not. It is not capable of making any other type of judgement.
Therefore, it is absolutely necessary for the driver to remain vigilant and to deter-
mine 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 no 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.
■To avoid inadvertent dynamic radar cruise control activation
Switch the cruise control off using the “ON-OFF” button when not in use.
RX350_270_EE_48D77E.book 245 ページ ２０１４年１月２４日　金曜日　午前１０時４分

246
2-4. Using other driving systems
RX350/270_EE
CAUTION
■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
resulting in death or serious injury.
●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 expressways
●When weather conditions are bad enough that they may prevent the sensors
from functioning correctly (fog, snow, sandstorm, heavy rain, etc.)
●When an approach warning buzzer is heard often
●When your vehicle is towing a trailer or during emergency towing
■When the sensor may not be correctly detecting the vehicle ahead
Apply the brakes as necessary when any of the following types of vehicles are in
front of you.
As the sensor may not be able to correctly detect these types of vehicles, the
approach warning (→P. 239) will not be activated, and a fatal or serious accident
may result.
●Vehicles that cut in suddenly
●Vehicles traveling at low speeds
●Vehicles that are not moving
●Vehicles with small rear ends (trailers with no load on board etc.)
●Motorcycles traveling in the same lane
RX350_270_EE_48D77E.book 246 ページ ２０１４年１月２４日　金曜日　午前１０時４分

247
2-4. Using other driving systems
2
When driving
RX350/270_EE
CAUTION
■Conditions under which the vehicle-to-vehicle distance control may not function
correctly
Apply the brakes as necessary in the following conditions as the radar sensor may
not be able to correctly detect vehicles ahead, and a fatal or serious accident may
result:
●When water or snow thrown up by the surrounding vehicles hinders the function-
ing of the radar sensor
●When your vehicle is pointing upwards (caused by a heavy load in the luggage
compartment etc.)
●When the road curves or when the lanes are narrow
●When steering wheel operation or your position in the lane is unstable
●When the vehicle ahead of you decelerates suddenly
■Handling the radar sensor
Observe the following to ensure the cruise control system can function effectively.
Otherwise, the system may not function correctly and could result in an accident.
●Keep the sensor and grille cover clean at all times.
Clean the sensor and grille cover with a soft cloth so you do not mark or damage
them.
●Do not subject the sensor or surrounding area to a strong impact.
If the sensor moves even slightly off position, the system may malfunction. If the
sensor or surrounding area is subject to a strong impact, always have the area
inspected and adjusted by any authorized Lexus dealer or repairer, or another
duly qualified and equipped professional.
●Do not disassemble the sensor.
●Do not attach accessories or stickers to the sensor, grille cover or surrounding
area.
●Do not modify or paint the sensor and grille cover.
●Do not replace them with non-genuine parts.
RX350_270_EE_48D77E.book 247 ページ ２０１４年１月２４日　金曜日　午前１０時４分

309
2-5. Driving information
2
When driving
RX350/270_EE
CAUTION
■When the gross vehicle mass limit or maximum permissible axle capacity is
exceeded
Do not exceed the established speed limit for towing a trailer in built-up areas or
100 km/h (62 mph), whichever is the lower.
■Vehicle speed while towing
Observe the legal maximum speeds for trailer towing.
■Before descending hills or long declines
Reduce speed and downshift. However, never downshift suddenly while descend-
ing steep or long downhill grades.
■Operation of the brake pedal
Do not hold the brake pedal depressed often or for long periods of time.
Doing so may result in the brake overheating or reduce braking effects.
■To avoid accident or injury
●For vehicles with electronically modulated air suspension, set the vehicle height
to LO mode and turn off the electronically modulated air suspension to prevent
the vehicle height from automatically changing.
●Do not use cruise control when you are towing.
●Do not tow the vehicle with the compact spare tire installed.
RX350_270_EE_48D77E.book 309 ページ ２０１４年１月２４日　金曜日　午前１０時４分

510
4-3. Do-it-yourself maintenance
RX350/270_EE
35A/F*110 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
WIP-S*27. 5 ACruise control
36ECU-IG1 NO. 410 A
Adaptive front-lighting system, air
conditioning system, rear window
defogger, vehicle stability control sys-
tem, electric cooling fans
37BK/UP LP7. 5 ABack-up lights
38ECU-IG1 NO. 515 AAir conditioning system
39ECU-IG1 NO. 610 A
Adaptive front-lighting system, head
light cleaner, cruise control, electroni-
cally modulated air suspension, vehi-
cle stability control, air conditioning
system
40EFI NO. 210 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
41F/ P M P*215 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
42DEICER25 AWindshield wipers and washer
43STOP7. 5 A
Vehicle stability control, vehicle
dynamics integrated management,
stop lights, electronic controlled
transmission, multiport fuel injection
system/sequential multiport fuel injec-
tion system, shift lock control system,
starter system
44TOW IN G BAT T20 ATr a i l e r b a t t e r y
FuseAmpereCircuit
RX350_270_EE_48D77E.book 510 ページ ２０１４年１月２４日　金曜日　午前１０時４分

556
5-2. Steps to take in an emergency
RX350/270_EE
Indicates a malfunction in the cruise control system
or the radar cruise control system (If equipped)
Press the “ON-OFF” button once to deactivate the
system, and then press the button again to reactivate
the system.
(If equipped)
Indicates a malfunction in the automatic headlight
leveling system
Indicates a malfunction in:
• The SRS airbag system; or,
• The seat belt pretensioner system
Indicates a malfunction in:
•The ABS; or,
• The brake assist system
Indicates a malfunction in the EPS (Electric Power
Steering) system
Warning messageDetails
RX350_270_EE_48D77E.book 556 ページ ２０１４年１月２４日　金曜日　午前１０時４分

560
5-2. Steps to take in an emergency
RX350/270_EE
(If equipped)
Indicates that the radar
cruise control sensor is
dirty or covered with ice
A buzzer also sounds.
Clean the sensor.
(If equipped)
Indicates that the radar
cruise control system is
unable to judge vehicle-
to-vehicle distance
A buzzer also sounds.
• Switch driving mode to
normal.
• If the windshield wipers
are on, turn them off or
set them to a mode other
than “AUTO” or high
speed wiper operation.
(Flashes)
(If equipped)
Indicates that there is a
high possibility of a fron-
tal collision, or that the
pre-crash braking func-
tion is operating
A buzzer also sounds.
At the same time,
will appear on
the head-up display (the
image flashes).
Slow the vehicle by apply-
ing the brakes.
Wa r n i n g m e s s a g eDetailsCorrection procedure
RX350_270_EE_48D77E.book 560 ページ ２０１４年１月２４日　金曜日　午前１０時４分