stop start Lexus GX470 2005 Engine / LEXUS 2005 GX470 (OM60B11U) Owner's Guide

STARTING AND DRIVING
423
NOTICE
Use the ªLOº mode when the vehicle is stopped.Otherwise, when the vehicle speed exceeds about 12km/h (7 mph), ªNº mode is selected automatically. Sobe careful when you drive in any place where theoverhead height is limited.
(b) Vehicle height mode changing condition
To change the vehicle height, it is necessary to meet the
following conditions.
 The engine should be running.
 The height control ªOFFº indicator light should go off. 
When selecting a mode, there is a vehicle speed limit. Refer
to the following table.
Yes = The mode can be selected.
No = The mode cannot be selected.
ªLOº
modeªNº
modeªHIº
mode
Under about
12 km/h (7 mph)Ye sYe sYe s
Under about
30 km/h (19 mph)NoYe sYe s
About 30 km/h
(19 mph) or overNoYe sNo

STARTING AND DRIVING
424In the following cases, the rear height control suspension
will not operate.

The underbody of the vehicle has touched the surface on
bumpy roads.
 The area around the rear suspension is coated with ice.
If the vehicle is moved to its usual location or the ice is removed
and the height select switch is pressed, the vehicle height
control cannot be operated. In this case, turn off and restart the
engine, then push the control switches.
(c) Vehicle height adjustment

1Higher2Lower
To change the mode, push the height select switch on
either side of ª º (higher) or ªº (lower). The height control indicator light indicates which mode is
selected. (See ª(e) Height control indicator lightº described
below.)

Selecting the ªHIº mode
Push the height select switch on the ª º side when the vehicle
speed is under about 30 km/h (19 mph).
To change the ªNº mode to ªHIº: Push the switch once.
To change the ªLOº mode to ªHIº: Push the switch twice. It
takes about 30 se conds until the ªLOº mode changes to the ªHIº
mode.
 Selecting the ªNº mode
To change the ªHIº mode to ªNº: Push the height select
switch on the ª º side once.
To change the ªLOº mode to ªNº: Push the height select
switch on the ª º side once.
 Selecting the ªLOº mode
Push the height select switch on the ªº side while the vehicle
is stopped.
To change the ªNº mode to ªLOº: Push the switch once.
To change the ªHIº mode to ªLOº: Push the switch twice.
Even if the engine is stopped while the vehicle height is being
lowered, the operation continues for up to 25 seconds. If within
this 25 seconds, any of the side doors or the back door is
opened, operation will continue for a further 15 seconds.

STARTING AND DRIVING
425
NOTICE
If the vehicle height is changed frequently when thevehicle is heavily loaded, the compressor mayoverheat causing the vehicle height adjustmentoperation to stop.
Before you lower the vehicle height with the heightselect switch, check under the vehicle to make surenothing to dam age 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 vehicle equipped with
the rear height control air suspension becomes
slightly higher than the normal vehicle height. Takesufficient care where the overhead height isrestricted.
Do not select the ªLOº mode in the bumpy roads. Ifthe underbody of the vehicle touches the ruggedroad surface, the vehicle may be damaged.

STARTING AND DRIVING
426
(d) Turning off the rear height control airsuspension
To turn off the rear height control air suspension with the
vehicle stopped, push the ªHEIGHT CONTROL OFFº
switch. The height control ªOFFº indicator light comes on
and the vehicle height is fixed in the same mode as the
height control switch is pushed.
This status is memorized in the system even after the engine
is stopped.
If you push the switch again, the height control ªOFFº indicator
light goes out and the rear height control air suspension is
turned on.
Even after the rear height control air suspension is turned off
with the ªHEIGHT CONTROL OFFº switch, if the vehicle speed
exceeds 30 km/h (19 mph), the rear height control air
suspension automatically selects the ªNº mode.
CAUTION
If you drive through deep water over about 700 mm (28
in.) in depth, put the vehicle height in the ªHIº mode with
the height select switch and then turn off the rear height
control air suspension by pushing the ªHEIGHT
CONTROL OFFº switch.

STARTING AND DRIVING
427
NOTICE
When jacking up or installing tire chains, be sure toturn off the rear height control air suspension withthe ªHEIGHT CONTROL OFFº switch and stop theengine. Otherwise, the vehicle height may changebecause of the automatic leveling function resultingin accident.
If your vehicle must be towed, put the vehicle heightin the ªNº mode and turn off the rear height control airsuspension. Otherwise, the vehicle height may
change because of the automatic leveling functionresulting in accident.
If your vehicle gets ditched, turn off the rear heightcontrol air suspension with the ªHEIGHT CONTROLOFFº switch. Otherwise, the vehicle height maychange because of the automatic leveling functionresulting in accident.

STARTING AND DRIVING
429
(f) Parking and stopping tips
If you immediately stop the engine to park the vehicle after
off±road driving, the vehicle height is lowered slightly as the
vehicle becomes cool. When parking, make sure there is
nothing that will be in contact with the underbody of the vehicle.
When you start the engine, the vehicle returns to the previous
height.
If you park the vehicle for a long time, the vehicle height may
be gradually lowered. When parking for a long time, make sure
there is nothing that will be in contact with the underbody of the
vehicle. When you start the engine, the vehicle returns to the
previous height.
If you stop the engine, the vehicle height may change in
accordance with the change in the temperature. When you
start the engine, the vehicle returns to the previous height.
(g) Rear height control failure warning
If there is a problem somewhere in the rear height control air
suspension, the ªNº mode is automatically selected. If this
occurs, the height control ªOFFº indicator light blinks and the
vehicle height control cannot be activated until the malfunction
is corrected. If this is the case, bring your vehicle to your Lexus
dealer as soon as possible and have it checked.
ELECTRONIC MODULATED SUSPENSION
This electronic modulated suspension adjusts the
damping effect on the shock absorbers with the control
switch. Select one of the 4 modes which is suited to the
driving conditions with the control switch to provide good
riding comfort and stability.
1For driving on a bumpy road
2For ordinary driving such as in the city traffic
3For moderate high speed driving
4For sporty type driving such as on winding mountain
roads and high speed driving
5Soft
6Firm

STARTING AND DRIVING
431

Slip indicator light
Leave the system on during the ordinary driving so that it
can operate when needed.
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 active traction control
system is in the self±check mode, but does not indicate a
malfunction.
When the active traction control system is operating, the
following conditions occur:
 The system controls the spinning of the 4 wheels. At this
time, the slip indicator light blinks.
 You may feel vibration or noise in your vehicle, caused by
operation of the brakes. This indicates the system is
functioning properly. The slip indicator light comes on for a few seconds when the
ignition key is turned to ªONº. If the indicator light does not
come on when the ignition is turned on, contact your Lexus
dealer.
The brake actuator temperature increase during continuous
operation of the following systems.

Active traction control system
 Vehicle stability control system
 Downhill assist control system
 Hill±start assist control
If the brake actuator temperature becomes too high while any
of the systems is operating, a buzzer will start to sound
intermittently to indicate that the active traction control system
can no longer 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 slip indicator light
will come on and the active traction control system temporarily
stops operating in order to protect the brake actuator.
(Although the active traction control system does not operate,
there is no problem to continue your driving.) The system will
be automatically restored after a short time and the slip
indicator light goes out.

STARTING AND DRIVING
437
If the downhill assist control system indicator light flashes, the
transmission selector lever may be in ªNº or four±wheel drive
control lever may be in the ªHº position.
If the indicator light does not come on when the switch is
pushed, contact your Lexus dealer.

Slip indicator light
With the vehicle traveling at a speed of 25 km/h (15 mph) or
less, release your foot from the accelerator or brake pedal to
activate the system. The vehicle will descend the hill at a low
speed. While the system is operating, the slip indicator light on
the instrument panel will flash and the stop lights and high
mounted stoplight will be lit.
If you push the ªDACº switch to turn the system off while it is
in operation, the system will stop operating gradually. The
downhill assist control system indicator light will flash to alert
the driver. To continue driving at a low speed, push the ªDACº
switch to turn the system on.
The slip indicator light and downhill assist control system
indicator l
ight come on for a few seconds when the ignition key
is turned to ªONº. If any of the indicator lights does not come
on when the ignition is turned on, contact your Lexus dealer.
The brake actuator temperature increases during continuous
operation of the following systems.
 Active traction control system
 Vehicle stability control system
 Downhill assist control system
 Hill±start assist control
If the brake actuator temperature becomes too high while any
of the systems is operating, a buzzer will start to sound
intermittently to indicate that the downhill assist control system
can no longer operate. In this case, stop your vehicle
immediately 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 this time, the slip indicator light
will come on and the downhill assist control system stops
operating temporarily in order to protect the brake actuator.
(Although the downhill assist control system does not operate,
it is no problem to continue your driving.) The system will be
automatically restored after a short time and the slip indicator
light goes out.

STARTING AND DRIVING
439
HILL±START ASSIST CONTROL
The hill±start assist control assists you in starting to move
up a steep or slippery hill. When you start to move up the
hill slope, the system helps to prevent the vehicle from
rolling backward in the interval while you move your foot
from the brake pedal to the accelerator pedal.
CAUTION
Do not rely excessively on the hill±start assist
control. The vehicle may not be able to start
smoothly on road surfaces or off±road surfaces such
as extremely steep slopes or icy roads, on which
sliding can occur very easily.
 Do not use the hill±start assist control to stop the
vehicle. The hill±start assist control is not designed
as a function for stopping the vehicle on a uphill
slope.
The hill±start assist control will operate for 5 seconds
maximally when all of the following conditions apply.
When the transmission is in any of positions ªDº, ª4º,
ª3º, ª2º or ªLº
 When the brake pedal is not depressed
The system is designed to operate when the vehicle is starting
on an uphill slope; therefore, if the transmission is in ªPº or ª\
Nº
it will not operate. It will not operate either if the vehicle starts
to move in reverse on a slope with the transmission in the ªRº.

Slip indicator light
When the hill±start assist control is operating, the slip indicator
light flashes and an alarm sounds intermittently. At the same
time, the stop lamps and high mounted stoplight are lit.
The slip indicator light comes on for a few seconds when the
ignition key is turned to ªONº. If the indicator light does not
come on when the ignition is turned on, contact your Lexus
dealer.

STARTING AND DRIVING
440Keep in mind the following when driving.

The hill±start assist control operates for 5 seconds
maximally. If both the brake and accelerator pedals remain
undepressed for longer than 5 seconds, the buzzer will
sound at more frequent intervals and the system will
gradually stop operating.
 The hill±start assist control is not designed as a function for
stopping the vehicle on a uphill slope. When stopping the
vehicle, be sure to depress the brake pedal.
The brake actuator temperature increases during continuous
operation of the following systems.
 Active traction control system
 Vehicle stability control system
 Downhill assist control system
 Hill±start assist control
If the brake actuator temperature becomes too high while any
of the systems is operating, a buzzer will start to sound
intermittently to indicate that the hill±start assist control can no
longer operate. In this case, stop your vehicle immediately 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 this time, the slip indicator light
will come on and the hill±start assist control stops operating
temporarily in order to protect the brake actuator. (Although
the hill±start assist control does not operate, it is no problem
to continue your driving.) The system will be automatically
restored after a short time and the slip indicator light goes out.