brake LEXUS LX570 2014 Service Manual

3472-4. Using other driving systems
2
When driving
LX570_OM_OM60L21U_(U) Driving assist systems To help enhance driving safety and performance, the following systems
operate automatically in response to various driving situations. Be aware,
however, that these systems are supplementary and should not be relied
upon too heavily when operating the vehicle.
■ Multi Terrain ABS (Anti-lock Brake System) Helps to prevent wheel lock when the brakes are applied suddenly, or if
the brakes are applied while driving on a slippery road surface, or in off-
road conditions (such as rough roads, sand and mud).
■ Brake assist Generates an increased level of braking force after the brake pedal is
depressed, when the system detects a panic stop situation.
■ VSC (Vehicle Stability Control) Helps the driver to control skidding when swerving suddenly or turning on
slippery road surfaces.
■ Active TRAC (Traction Control) Helps to maintain drive power and prevent the 4 wheels from spinning
when starting the vehicle or accelerating on slippery roads.
■ Hill-start assist control Helps to prevent the vehicle from rolling backwards when starting on an
incline or slippery slope.
■ VGRS (Variable Gear Ratio Steering) Helps to adjust the wheel turning angle in accordance with the vehicle
speed and steering wheel movement.
■ PCS (Pre-Collision System) (if equipped)  P. 3 5 5

3482-4. Using other driving systems
LX570_OM_OM60L21U_(U) When the VSC/Trailer Sway Control/ Active TRAC/hill-start assist con-
trol systems are operating
The slip indicator light flashes to
indicate that the VSC/Trailer Sway
Control/Active TRAC/hill-start
assist control systems have been
engaged. The stop lights and high mounted
stoplight turn on when the hill-start
assist control system or Trailer
Sway Control is operating.■ Trailer Sway Control Helps the driver to control trailer sway by selectively applying brake pres-
sure for individual wheels and reducing engine torque when trailer sway is
detected.
Trailer Sway Control is part of the VSC system and will not operate if
VSC turned off or expe riences a malfunction.

3502-4. Using other driving systems
LX570_OM_OM60L21U_(U) ■
When the message is displayed on the multi-information display showing that
TRAC has been disabled even if the VSC OFF switch has not been pressed
Active TRAC, hill-start assist control, Cr awl Control cannot be operated. Contact
your Lexus dealer. ■
Automatic reactivation of Active TRAC, VSC and Trailer Sway Control
Turning the “ENGINE START STOP” switch off after turning off the Active TRAC
and VSC systems will auto matically re-e nable them.■
Automatic Active TRAC reactivation
If only the Active TRAC system is turned off, the Active TRAC system will turn on
when vehicle speed increases. ■
Automatic Active TRAC, VSC and Trailer Sway Control reactivation
If the Active TRAC, VSC and Trailer Sway Control are turned off, the systems will
not turn on even when vehicle speed increases. ■
If the brake system overheats
The brake system may overheat. In this case, a buzzer will sound, and the “TRAC
OFF” will be displayed on th e multi-information display, and Active TRAC and hill-
start assist control will be temporarily inop erable. In this event, stop the vehicle
immediately in a safe place, and allow the brake system to cool down sufficiently
until the “TRAC OFF” on the multi-informatio n display goes off. (There is no prob-
lem with continuing normal driving.)

3512-4. Using other driving systems
2
When driving
LX570_OM_OM60L21U_(U) ■
Sounds and vibrations caused by the Multi Terrain ABS, brake assist, Active
TRAC, VSC, Trailer Sway Control, hill-start assist control and VGRS ●
A sound may be heard from the engi ne compartment when the engine is
started or just after the vehicle begins to move. This sound 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 operat-
ing. 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 after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the Multi Terrain ABS is activated.
• The brake pedal may move down slightly after the Multi Terrain ABS is acti-
vated.■
Hill-start assist control is operational when ●
The shift lever is in “D” or “S”. ●
The brake pedal is not depressed.■
VGRS is disabled in the following situations ●
During stopping or the st eering wheel has been moved for a long time while
driving at lower speeds. ●
After the engine is restarted at less than -22°F (-30°C). ●
If you disconnect the battery with the steering wheel turned, the center position
of the steering wheel could be slightly and temporary changed. To initialize the
VGRS, drive for a short while.

3542-4. Using other driving systems
LX570_OM_OM60L21U_(U) CAUTION■
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 conditions of the vehicle, trailer, road sur-
face, and driving environment, the Trailer Sway Control system may not be effec-
tive. 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 wheel. Steer straight ahead.
Do not try to control trailer sway ing by turning the steering wheel.●
Begin releasing the accelerator pedal im mediately 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. 395)

3552-4. Using other driving systems
2
When driving
LX570_OM_OM60L21U_(U) Pre-Collision System 
 : If equippedWhen the radar sensor detects possibilit y of a frontal collision, the pre-col-
lision systems such as the brakes and seat belts are automatically engaged
to lessen impact as well as vehicle damage.
■ Pre-collision seat belts (front seats only) If the pre-collision sensor detects that a collision is unavoidable, the pre-
collision system will retract the seat belt before the collision occurs.
The same will happen if the driver makes an emergency braking or loses
control of the vehicle. (  P. 9 4 )
However, when the VSC system is disabled, the system will not operate in
the event of skidding.
■ Pre-collision brake assist When there is a high possibility of a frontal collision, the system applies
greater braking force in relation to how strongly the brake pedal is
depressed.
■ AVS control When the system determines that there is a high possibility of a frontal col-
lision, the AVS optimizes the damping effect. (  P. 3 2 9 )

3572-4. Using other driving systems
2
When driving
LX570_OM_OM60L21U_(U) ●
Pre-collision brake assist
• Vehicle speed is greater than about 19 mph (30 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle
running ahead of you is greater than about 19 mph (30 km/h).
• The brake pedal is depressed. ●
AV S
• Vehicle speed is greater than about 4 mph (5 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle
running ahead of you is greater than about 19 mph (30 km/h).■
Conditions that may trigger the system even if there is no possibility of collision ●
When there is an object by the roadside at the entrance to a curve ●
When passing an oncoming vehicle on a curve ●
When driving over a narrow iron bridge●
When there is a metal object on the road surface ●
When driving on an uneven road surface (nose up, nose down)●
When passing an oncoming vehicle on a left-turn ●
When your vehicle rapidly closes on the vehicle in front ●
When a grade separation/interchange, sign, billboard, or other structure
appears to be directly in the vehicle’s line of travel ●
When climbing a steep hill causes an over head billboard or ot her metallic struc-
ture to appear directly in the vehicle’s line of travel ●
When an extreme change in vehicle height occurs ●
When the axis of the radar is out of adjustment ●
When passing through certain toll gates ●
When passing through an overpass ●
When passing through a tunnel
When the system is activated in the situations described above there is also a possi-
bility that the seat belts will retract quickly and the brakes will be applied with a force
greater than normal. When the seat belt is locked in the retracted position, stop the
vehicle in a safe place, release the seat belt and refasten.

3642-5. Driving information
LX570_OM_OM60L21U_(U) CAUTION■
Off-road driving precautions
Always observe the following precautions to minimize the risk of serious personal
injury or damage to your vehicle: ●
Drive carefully when off the road. Do not take unnecessary risks by driving in
dangerous places. ●
Do not grip the steering wheel spokes wh en driving off-road. A bad bump could
jerk the wheel and injure your hands. Keep both hands and especially your
thumbs on the outside of the rim. ●
Always check your brakes for effectiveness immediately after driving in sand,
mud, water or snow. ●
After driving through tall grass, mud, rock, sand, rivers, etc., check that there is no
grass, bush, paper, rags, stone, sand, etc. adhering or trapped on the underbody.
Clear off any such matter from the underbody. If the vehicle is used with these
materials trapped or adhering to the underbody, a breakdown or fire could occur. ●
When driving off-road or in rugged te rrain, do not drive at excessive speeds,
jump, make sharp turns, strike objects, etc. This may cause loss of control or vehi-
cle rollover causing death or serious injury. You are also risking expensive dam-
age to your vehicle’s suspension and chassis.

3652-5. Driving information
2
When driving
LX570_OM_OM60L21U_(U) NOTICE■
To prevent the water damage
Take all necessary safety measures to en sure that water dama ge to the engine or
other components does not occur. ●
Water entering the engine air intake will cause severe engine damage. ●
Water entering the automatic transmission will cause deterioration in shift quality,
locking up of your transmission accompanied by vibration, and ultimately dam-
age. ●
Water can wash the grease from wheel bearings, causing rusting and premature
failure, and may also enter the differentials, transmission and transfer case, reduc-
ing the gear oil’s lubricating qualities.■
When you drive through water
If driving through water, such as when crossing shallow streams, first check the
depth of the water and the bottom of the river bed for firmness. Drive slowly and
avoid deep water. ■
Inspection after off-road driving ●
Sand and mud that has accumulated in brake drums and around brake discs may
affect braking efficiency and may damage brake system components. ●
Always perform a maintenance inspection after each day of off-road driving that
has taken you through rough terrain, sand, mud, or water. For scheduled mainte-
nance information, refer to the “Warra nty and Services Guide/Owner’s Manual
Supplement/Schedul ed Maintenance”.

3702-5. Driving information
LX570_OM_OM60L21U_(U) CAUTION■
Things that must not be carri ed in the luggage compartment
The following things may cause a fire if loaded in the luggage compartment. ●
Receptacles containing gasoline ●
Aerosol cans■
Storage precautions
Observe the following precautions.
Failing to do so may result in death or serious injury. ●
Stow cargo and luggage in the lugga ge compartment whenever possible.●
Do not stack anything in the luggage compartment higher than the seatbacks.
Such items may be thrown about and possib ly injure people in the vehicle during
sudden braking, sudden swerving or in an accident. ●
Do not place cargo or luggage in or on the following locations as the items may
get under the brake or accelerator pedal and prevent the pedals from being
depressed properly, block the driver’s vision, or hit the driver or passengers,
causing an accident.
•Driver’s feet
• Front passenger or rear seats (when stacking items)
•Instrument panel
•Dashboard
• Auxiliary box or tray that has no lid ●
Secure all items in the occupant compartment, as they may shift and injure some-
one during sudden braking, sudd en swerving or an accident.●
When you fold down the rear seats, long items should not be placed directly
behind the front seats. ●
Never allow anyone to ride in the luggage compartment. It is not designed for
passengers. They should ride in their seat s with their seat belt s properly fastened.
Otherwise, they are much more likely to suffer death or serious injury, in the
event of sudden braking, sudd en swerving or an accident.