2007 TOYOTA LAND CRUISER traction control

153
The brake actuator temperature increases
during the active traction control system
or vehicle stability control system operat-
ing. If the brake actuator temperature be-
comes too high while the active traction
control system or vehicle stability control
system is operating, a buzzer will start to
sound intermittently to indicate that the
active traction control system can no lon-
ger operate. In this case, immediately stop
your vehicle at a safe place. If the system
continues to operate, the buzzer sound
changes from intermittent to continuous.
(The continuous buzzer sounds for about
3 seconds.) At the time, the “VSC/TRAC”
warning light will come on and the active
traction control system temporarily stops
operating in order to protect the brake
actuator. (Although the active traction con-
trol system does not operate, there is no
problem to continue your driving.) The
system will be automatically restored after
a short time and “VSC/TRAC” warning
light goes off if the accelerator pedal is
released.
When the “ABS” warning light come on,
the active traction control system is not
operating.
The “VSC/TRAC” warning light will come
on when the ignition key is turned “ON”,
and will go off after a few seconds.The “VSC/TRAC” warning light may stay
on for 60 seconds after the ignition key
is turned to “ON” position. It is normal if
it goes off after a few seconds.
Depressing the brake pedal repeatedly
may turn on the “VSC/TRAC” warning
light. It is normal if it goes off after a few
seconds.
When the “VSC/TRAC” warning light
comes on the active traction control sys-
tem is not operating, but there is no prob-
lem if you continue to drive.
In the following cases, contact your Toyota
dealer:
The “VSC/TRAC” warning light does not
come on after the ignition key is turned
“ON”.
The “VSC/TRAC” remains on after the
ignition key is turned “ON”.
CAUTION
Under certain slippery road condi-
tions, full traction of the vehicles and
power to 4 wheels may not be main-
tained, even though the active trac-
tion control system is in operation.
Do not drive the vehicle under any
speed or maneuvering conditions
which will cause the vehicle to lose
traction. In situations where the road
surface is covered with ice or snow,
your vehicle should be fitted with
snow tires or tire chains. Always
drive at an appropriate and cautious
speed for the road conditions pres-
ent.

154
The vehicle stability control system
helps provide integrated control of the
systems such as antilock brake, trac-
tion control, engine control, etc. This
system automatically controls the out-
put of the brakes or engine to help
prevent the vehicle from skidding under
adverse conditions.
The vehicle stability control system is acti-
vated when the vehicle speed is about
more than 15 km/h (9 mph).
You may hear a sound in the engine
compartment for a few seconds when the
engine is started or just after the vehicle
begins to move. This means that the ve-
hicle stability control system is in the
self−check mode and does not indicate a
malfunction.CAUTION
Active traction control system, ve-
hicle stability control system and
antilock brake system are electron-
ic systems designed to help the
driver maintain control under ad-
verse conditions. They are not a
substitute for safe driving practices.
Factors including speed, road con-
ditions and driver steering input
can all affect whether active trac-
tion control system, vehicle stability
control system and antilock brake
system will be effective in prevent-
ing a loss of control. Always keep
safety driving in mind. If the slip
indicator light flashes, sounding an
alarm, special care should be taken
while driving.
Only use tires of specified size. The
size, manufacturer, brand and tread
pattern for all 4 tires should be the
same. If you use the tires other
than specified, or different type or
size, the vehicle stability control
system may not function correctly.
When replacing the tires or wheels,
contact your Toyota dealer. (See
“Checking and replacing tires” on
page 333.)
Vehicle stability control
system

155
If the vehicle is going to skid during driv-
ing, the slip indicator light flashes and an
alarm sounds intermittently.
When you turn the ignition switch on, the
slip indicator light will come on. The slip
indicator light will go off after a few sec-
onds.Pushing the center differential lock button
automatically turns the vehicle stability
control system off. At this time, the “VSC
OFF” indicator comes on with the center
differential lock indicator light. (For details,
see “Four−wheel drive system—(a)Four −
wheel drive control” on page 149.)Vehicle stability control system failure
warning
These lights warn when there is a prob-
lem somewhere in the vehicle stability
control system or active traction control
system.
If the “VSC/TRAC” warning light and “VSC
OFF” indicator light come on, have your
vehicle checked by your Toyota dealer as
soon as possible. However, there is no
problem if the “VSC/TRAC” warning light
comes on when the brake actuator tem-
perature becomes high. (For details, see
“Active traction control system” on page
152.)

170
(d) Vehicle height adjustment
To change the mode, push the height
select switch on either side of
“
”(higher) and “”(lower).
The height control indicator light indicates
which mode is selected. (See “(f) Height
control indicator lights” described below.)
NOTICE
 If you change the vehicle height fre-
quently, the pump may overheat. To
prevent this, the active height con-
trol suspension should be stopped
temporarily for a minute between
selections. Operate it again.
 Before you lower the vehicle height
with the height select switch, check
under the vehicle to make sure
nothing to damage the vehicle or
no one to be injured is there and
that the underbody of the vehicle
does not touch the ground.
 After unloading, the height of a ve-
hicle equipped with the active
height control suspension becomes
slightly higher than the normal ve-
hicle height. Take sufficient care
where the overhead height is re-
stricted.
The vehicle height cannot be raised if
the vehicle load exceeds the following
limits:
Up to 4 occupants∗ plus about 280 kg
(617 lb.) in the normal mode
Up to 4 occupants∗ plus about 150 kg
(331 lb.) in the high mode
∗: About 75 kg (165 lb.) for a person
If the above load capacity is exceeded,
the desired vehicle height may not be ob-
tained even if the height select switch is
pushed. (If the vehicle height cannot be
raised in the normal mode and the height
control indicator indicates “LO”, this is be-
cause the vehicle is loaded too heavily.
Under these conditions, drive your vehicle
with due care.)
If the vehicle height cannot be raised
even after unloading, push the height se-
lect switch on the “
” side and then on
the “
” side. If this does not work, turn
off the ignition once and then turn on.
Operate the select switch again.
If the vehicle height is adjusted on the
slope, or with the selector lever in a posi-
tion other than “P” or “N” while the vehicle
is stopped, you may hear a sound caused
by the expansion and contraction of the
propeller shaft.

244
When the “ABS” warning light is on (and
the brake system warning light is off), the
anti−lock brake system, the brake assist
system, the vehicle stability control sys-
tem and/or active traction control system
do/does not operate, but the brake system
still operates conventionally.
When the “ABS” warning light is on (and
the brake system warning light is off), the
anti −lock brake system does not operate
so that the wheels could lock up during
a sudden braking or braking on slippery
road surfaces.
If either of the following conditions oc-
curs, this indicates a malfunction some-
where in the components monitored by
the warning light system. Contact your
Toyota dealer as soon as possible to
service the vehicle.
The light does not come on when the
ignition key is turned to the “ON” posi-
tion, or remains on.
The light comes on while you are driv-
ing.
A warning light turning on briefly during
operation does not indicate a problem.
CAUTION
If the “ABS” warning light remains on
together with the brake system warn-
ing light, immediately stop your ve-
hicle at a safe place and contact your
Toyota dealer.
In this case, not only the antilock
brake system will fail but also the
vehicle will become extremely unsta-
ble during braking.
Either of the following conditions may
occur, but do not indicate a malfunc-
tion.
The light may stay on for about 60
seconds after the ignition key is turned
to “ON” position. It is normal if it turns
off after a while.
Depressing the brake pedal repeatedly
may turn on the light. It is normal if it
turns off after a few seconds. DRUMINDISC TYPE PARKING BRAKE
SYSTEM
Your vehicle has a drum
−in −disc type
parking brake system. This type of brake
system n eeds bedding −down of the brake
shoes periodically or whenever the parking
brake shoes and/or drums are replaced.
Have your Toyota dealer perform the bed-
ding− down.
BRAKE ASSIST SYSTEM
When you slam the brakes on, the
brake assist system judges as an emer-
gency stop and provides more powerful
braking for a driver who cannot hold
down the brake pedal firmly.
When you slam the brakes on, more pow-
erful braking will be applied. At this time,
you may hear a sound in the engine
compartment and feel the vibrations of the
brake pedal. This does not indicate a mal-
function.
The brake assist system becomes opera-
tive after the vehicle has accelerated to
a speed in excess of approximately 10
km/h (6 mph). It stops operating when the
vehicle decelerates to a speed below
approximately 5 km/h (3 mph).

251
—Uniform tire quality grading
This information has been prepared
in accordance with regulations issued
by the National Highway Traffic Safe-
ty Administration of the U.S. Depart-
ment of Transportation. It provides
the purchasers and/or prospective
purchasers of Toyota vehicles with in-
formation on uniform tire quality grad-
ing.
Your Toyota dealer will help answer
any questions you may have as you
read this information.
DOT quality grades—All passenger
vehicle tires must conform to Fed-
eral Safety Requirements in addi-
tion to these grades. Quality
grades can be found where appli-
cable on the tire sidewall between
tread shoulder and maximum sec-
tion width. For example: Treadwear
200 Traction AA Temperature A.Tread wear—
The tread wear grade
is a comparative rating based on the
wear rate of the tire when tested un-
der controlled conditions on a speci-
fied government test course. For ex-
ample, a tire graded 150 would wear
one and a half (1 −1/2) times as well
on the government course as a tire
graded 100. The relative performance
of tires depends upon the actual
conditions of their use, however, and
may depart significantly from the
norm due to variations in driving hab-
its, service practices and differences
in road characteristics and climate. Traction AA, A, B, C—
The traction
grades, from highest to lowest, are
AA, A, B, and C, and they represent
the tire’s ability to stop on wet pave-
ment as measured under controlled
conditions on specified government
test surfaces of asphalt and concrete.
A tire marked C may have poor trac-
tion performance.
Warning: The traction grade assigned
to this tire is based on braking
(straight ahead) traction tests and
does not include cornering (turning)
traction.

260
Types of tires
Determine what kind of tires your
vehicle is originally equipped with.1. Summer tires
Summer tires are high −speed capabil-
ity tires best suited to highway driving
under dry conditions.
Since summer tires do not have the
same traction performance as snow
tires, summer tires are inadequate for
driving on snow −covered or icy roads.
For driving on snow −covered or icy
roads, we recommend using snow
tires. If installing snow tires, be sure
to replace all four tires.
2. All season tires
All season tires are designed to pro-
vide better traction in snow and to be
adequate for driving in most winter
conditions, as well as for use all year
round. All season tires, however, do not have
adequate traction performance
compared with snow tires in heavy or
loose snow. Also, all season tires fall
short in acceleration and handling
performance compared with summer
tires in highway driving.
The details about how to distinguish
summer tires from all season tires are
described on page 248.
CAUTION

Do not mix summer and all sea-
son tires on your vehicle as
this can cause dangerous han-
dling characteristics, resulting
in loss of control.
 Do not use tires other than the
manufacturer’s designated
tires, and do not mix tires or
wheels of the sizes different
from the originally equipped
tires and wheels as this could
result in loss of control and
could cause death or serious
injury.