2019 Lexus GX460 ABS

358
GX460_OM_OM60Q84U_(U)4-5. Using the driving support systems
■Sounds and vibrations caused by the AB
S/Multi Terrain ABS, brake assist, TRAC/
Active TRAC, VSC/Trailer Sway Control and hill-start assist control systems
●A sound may be heard from the engine compartment when the engine is started or just
after the vehicle begins to move. This soun d does not indicate that a malfunction has
occurred in any of these systems.
●Any of the following conditions may occur when the above systems are operating.
None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard afte r the vehicle comes to a stop.
• The brake pedal may pulsate slightly afte r the ABS/Multi Terrain ABS is activated.
• The brake pedal may move down slightly after the ABS/Multi Terrain ABS is acti-
vated.
■Reactivation of the TRAC or Active TR AC/VSC/Trailer Sway Control systems after
turning off the engine
Turning off the engine after turning off the TRAC or Active TRAC/VSC/Trailer Sway
Control systems will automatically re-enabled them.
■Reactivation of the TRAC or Active TRAC system linked to vehicle speed
When only the TRAC or Active TRAC system is turned off, the TRAC or Active TRAC
system will turn on when vehi cle speed increases. However, when both TRAC or Active
TRAC and VSC/Trailer Sway Control systems ar e turned off, the systems will not turn on
even when vehicle speed increases.
■When the brake system operates continuously
The brake actuator may overheat . In this case, the TRAC or Active TRAC and hill-start
assist control systems will stop operating, a buzzer will sound and the “TRAC OFF” will
be shown on the multi-information display. Refrain from using the system until the mes-
sage goes off. (There is no proble m with continuing normal driving.)
■If the slip indicator comes on...
It may indicate a malfunction in the TRAC /Active TRAC, VSC/Trailer Sway Control or
hill-start assist control system. Consult your Lexus dealer.
■KDSS
Some difference of vehicle height between left and right side can appear. This does not
indicate a malfunction in the KDSS system. For more information, contact your Lexus
dealer.

GX460_OM_OM60Q84U_(U)
3594-5. Using the driving support systems
4
Driving
CAUTION
■The ABS/Multi Terrain ABS does not operate effectively when
●The limits of tire gripping performance have been exceeded (such as excessively
worn tires on a snow covered road).
●The vehicle hydroplanes while driving at high speed on the wet or slick road.
■Stopping distance when the ABS/Multi Terrain ABS is operating may exceed that of
normal conditions
The ABS/Multi Terrain ABS is not designed to shorten the vehicle’s stopping distance.
Always maintain a safe distance from the vehicle in front of you, especially in the follow-
ing situations:
●When driving on dirt, grav el or snow-covered roads
●When driving with tire chains
●When driving over bumps in the road
●When driving over roads with potholes or uneven surfaces
■TRAC/Active TRAC may not operate effectively when
Directional control and power may not be achievable wh ile driving on slippery road
surfaces, even if the TRAC/Active TRAC system is operating.
Do not drive the vehicle in conditions where stability and power may be lost.
■Hill-start assist control does not operate effectively when
Do not overly rely on the hill-start assist control. The hill-start assist control may not
operate effectively on steep inclines and roads covered with ice.
■When the VSC/Trailer Sway Control is activated
The slip indicator light flas hes. Always drive carefully.
Reckless driving may cause an accident. Exercise particular care when the indicator
light flashes.
■When the TRAC or Active TRAC/VSC/Trail er Sway Control systems are turned off
Be especially careful and drive at a speed appropriate to the road conditions. As these
are the systems to help ensure vehicle stab ility and driving force, do not turn the TRAC
or Active TRAC/VSC/Trailer Sway Co ntrol systems off unless necessary.

360
GX460_OM_OM60Q84U_(U)4-5. Using the driving support systems
CAUTION
■Replacing tires
Make sure that all tires are of the same si
ze, brand, tread pattern and total load capac-
ity. In addition, make sure that the tires ar e inflated to the recommended tire inflation
pressure level.
The ABS/Multi Terrain ABS, TRAC/Active TRAC and VSC/ Trailer Sway Control will
not function correctly if different tires are installed on the vehicle.
Contact your Lexus dealer for further in formation when replacing tires or wheels.
■Handling of tires and the suspension
Using tires with any kind of problem or modi fying the suspension will affect the driving
assist systems, and may caus e the system to malfunction.
■Trailer Sway Control precaution
The Trailer Sway Control system is not able to reduce trailer sway in all situations.
Depending on many factors such as the condit ions of the vehicle, trailer, road surface,
and driving environment, the Trailer Sway Control system may not be effective. Refer to
your trailer owner’s manual for information on how to tow your trailer properly.
■If trailer sway occurs
Observe the following precautions.
Failing to do so may cause death or serious injury.
●Firmly grip the steering wh eel. Steer straight ahead.
Do not try to control trailer sway ing by turning the steering wheel.
●Begin releasing the accelerator pedal immediately but very gradually to reduce
speed.
Do not increase speed. Do not apply vehicle brakes.
If you make no extreme correction with the steering or brakes, your vehicle and trailer
should stabilize. ( P. 188)

378
GX460_OM_OM60Q84U_(U)4-5. Using the driving support systems
CAUTION
■Limitations of the
pre-collision system
The driver is solely responsible for safe driving. Always drive safely, taking care to
observe your surroundings.
Do not use the pre-collision system instead of normal braking operations under any
circumstances. This system will not prevent collis ions or lessen damage or injuries in all
cases. Do not overly rely on this system. Failure to do so may cause an accident, result-
ing in death or serious injury.
This system has been designed to help avoid and redu ce the impact of collisions. How-
ever, the system operates differently depending on the situation ( P. 375, 376). As a
result, the same level of performance may no t be expected in all cases. Also, the pre-
collision brakes may not operate if the driver is depressing the brake pedal or turning
the steering wheel, as the sy stem will determine such conditions as collision avoidance
operations.
■Cautions regarding the assist contents of the system
By means of alarms and brake control, the pr e-collision system is intended to assist the
driver in avoiding collisions through the process of LOOK-JUDGE-ACT. There are
limits to the degree of assistance the system can provide, so please keep in mind the
following important points.
●Assisting the driver in watching the road
The pre-collision system is only able to detect obstacles directly in front of the vehicle,
and only within a limited range. It is not a mechanism that allows careless or inatten-
tive driving, and it is not a system that can assist the driver in low- visibility conditions. It
is still necessary for the driver to pay close attention to the vehicle’s surroundings.
●Assisting the driver in making correct judgment
When attempting to estimate the possibility of a collis ion, the only data available to
the pre-collision system is that from obstacles it has detected directly in front of the
vehicle. Therefore, it is absolutely necessa ry for the driver to remain vigilant and to
determine whether or not there is a possib ility of collision in any given situation.
●Assisting the driver in taking action
The pre-collision system’s braking assist feature is designed to help reduce the sever-
ity of a collision, and so only acts when the system has judged that a collision is
unavoidable. This system is not capable of automatically avoiding a collision or bring-
ing the vehicle to a stop safely without appropriate operations performed by the
driver. For this reason, when encountering a dangerous situation the driver must take
direct and immediate action in order to ensure the safety of all involved.

468
GX460_OM_OM60Q84U_(U)6-3. Do-it-yourself maintenance
■Brake fluid can absorb moisture from the air
Excess moisture in the fluid can cause a dang
erous loss of braking efficiency. Use only
newly opened brake fluid.
CAUTION
■When filling the reservoir
Take care because brake fluid can harm yo ur hands or eyes and damage painted sur-
faces. If fluid gets on your eyes, flush the affected area with clean water immediately. If
you still experience discomfort, see a doctor.
NOTICE
■If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads wear or when
the fluid level in the accumulator is high. If the reservoir needs freq uent refilling, it may
indicate a serious problem.

GX460_OM_OM60Q84U_(U)
4996-3. Do-it-yourself maintenance
6
Maintenance and care
Replace the light bulb, and install
the bulb base.
Align the 3 tabs on the light bulb with
the mounting, and insert.
Turn and secure the bulb base.
Shake the bulb base gently to check
that it is not loose, turn the headlights
on once and visually confirm that no
light is leaking through the mounting.
When installing the cover, conduct in reverse.
4
5
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518
GX460_OM_OM60Q84U_(U)7-2. Steps to take in an emergency
If a warning light turns on or a warning buzzer
sounds
Calmly perform the following actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, but then goes off, this does not necessar-
ily indicate a malfunction in the system
. However, if this continues to occur,
have the vehicle inspecte d by your Lexus dealer.
Warning light and warning buzzer list
Warning lightWarning light/Details/Actions
(U.S.A.)
(Canada)
Brake system warning light (warning buzzer) Indicates that:
• The brake fluid level is low; or
• The brake system is malfunctioning.
 Immediately stop the vehicle in a safe place and contact your
Lexus dealer. Continuing to drive the vehicle may be dangerous.
Charging system warning light
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and contact your
Lexus dealer.
(U.S.A.)
(Canada)
Malfunction indicator lamp Indicates a malfunction in:
• The electronic engine control system;
• The electronic throttle control system; or
• The electronic automatic transmission control system
 Have the vehicle inspected by your Lexus dealer immediately.
SRS warning light
Indicates a malfunction in:
• The SRS airbag system; or
• The seat belt pretensioner system
 Have the vehicle inspected by your Lexus dealer immediately.
(U.S.A.)
(Canada)
ABS warning light Indicates a malfunction in:
• The ABS; or
• The brake assist system
 Have the vehicle inspected by your Lexus dealer immediately.

5237-2. Steps to take in an emergency
GX460_OM_OM60Q84U_(U)
7
When trouble arises
CAUTION
■If both the ABS and the brake sy stem warning lights remain on
Stop your vehicle in a safe place immediat ely and contact your Lexus dealer. The vehi-
cle will become extremely unstable during br aking, and the ABS system may fail, which
could cause an accident resultin g in death or serious injury.
■If the tire pressure warning light comes on
Be sure to observe the following precautions. Failure to do so could cause loss of vehi-
cle control and result in death or serious injury.
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pressure
immediately.
●If the tire pressure warning light comes on even after tire inflation pressure adjust-
ment, it is probable that you have a flat tire. Check the tires. If the tire is flat, change to
the spare tire and have the flat tire repaired by the nearest Lexus dealer.
●Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could lose
control of the steering wheel or the brakes.
■If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.