2004 Lexus GX470 Audio System / LEXUS 2004 GX470 THROUGH OCT. 2003 PROD. OWNER'S MANUAL (OM60A46U)

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378
Setting operation

Each function is described below.
1Setting at a desired speed.
The transmission must be in Dº before you set the cruise
control speed.
Bring the vehicle to the desired speed, press the control lever
downward in the - SETº direction and release it. This sets the
vehicle at that speed. Now you may take your foot off the
accelerator pedal. If you need acceleration Ð for example,
when passing Ð depress the accelerator pedal enough for the
vehicle to exceed the set speed. When you release the
accelerator pedal, the vehicle will return to the speed set prior
to the acceleration.
2Cancelling the preset speed
You can cancel the preset speed by either of the following:
a. Pulling the control lever in the CANCELº direction.
b. Depressing the brake pedal.
If the vehicle speed falls below about 40 km/h (25 mph), the
preset speed will be automatically cancelled.
If the vehicle speed drops 16 km/h (10 mph) below the preset
speed, the preset speed will also automatically be cancelled.
If the preset speed automatically cancels out for other than
these reasons, have your vehicle checked by your Lexus
dealer at the earliest opportunity.
3Resetting to a faster speed
Press the control lever upward in the + RESº direction and
hold it. Release the lever when the desired speed is attained.
While the lever is held upward, the vehicle will gradually gain
speed.
When the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
increased 1.6 km/h (1 mph) each time by pressing the control
lever upward in the + RESº direction quickly within 0.6
seconds.
However, a quicker way to reset is to accelerate the vehicle and
then press the control lever downward in the - SETº direction.

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4Resetting to a slower speed
Press the control lever downward in the - SETº direction and
hold it. Release the lever when the desired speed is attained.
While the lever is held downward, the vehicle speed will
gradually decrease.
When the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
lowered 1.6 km/h (1 mph) each time by pressing the control
lever downward in the - SETº direction quickly within 0.6
seconds.
However, a quicker way to reset is to depress the brake pedal
and then press the control lever downward in the - SETº
direction.
Even if you downshift the transmission from the Dº position to
4º position with the cruise control on, engine braking will not
be applied because the cruise control is not cancelled. To
decrease the vehicle speed, reset to a slower speed with the
cruise control lever or depress the brake pedal. If you use the
brake pedal, cruise control is cancelled.
5Resuming the preset speed
If the preset speed is cancelled by pulling the control lever or
by depressing the brake pedal, pushing the lever up in the +
RESº direction will restore the speed set prior to cancellation.
However, once the vehicle speed falls below about 40 km/h (25
mph), the preset speed will not be resumed.
Cruise control failure warning
If the CRUISEº indicator light in the instrument cluster flashes
when using the cruise control, push the main switch to turn the
system off and then push it again to turn it on.
If any of the following conditions then occurs, there is some
trouble in the cruise control system.
The indicator light does not come on.
The indicator light flashes again.
The indicator light goes out after it comes on.
If this is the case, contact your Lexus dealer and have your
Lexus inspected.

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380
REAR HEIGHT CONTROL AIR
SUSPENSION
This rear height control air suspension controls the
vehicle height depending on the vehicle driving condition.
Select your desired height among the HIº (high), Nº
(normal) and LOº (low) modes with the height select
switch.
(a) Vehicle height modes
Nº (normal) mode: The vehicle height in this mode is
standard. Regardless of the number of occupants or the
luggage loading condition, the vehicle height is always
automatically adjusted to a fixed height in any mode while the
engine is running.
This mode is suitable for ordinary driving.HIº (high) mode: The vehicle height is about 40 mm (1.6 in.)
higher at the rear than the Nº mode height.
This mode is suitable when driving on the bumpy roads and
through water.
However, when the vehicle speed exceeds about 30 km/h (19
mph) or over in the HIº mode, the Nº mode is automatically
selected.
CAUTION
The HIº mode should be used for severe off-road
driving condition only. As the vehicle's center of gravity
is higher in this setting, the vehicle may become
unstable when turning abruptly resulting in accident.
LOº (low) mode: The vehicle height is about 20 mm (0.8 in.)
lower at the rear than the Nº mode height.
This mode allows you easy access to the vehicle (getting in and
out) and easy loading and unloading operation.
This mode is available when the vehicle speed is under about
12 km/h (7 mph).

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381
NOTICE
Use the LOº mode when the vehicle is stopped.
Otherwise, when the vehicle speed exceeds about 12
km/h (7 mph), Nº mode is selected automatically. So
be careful when you drive in any place where the
overhead 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 OFFº 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.
LOº
modeNº
modeHIº
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

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382In 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 º (higher) or º (lower).The height control indicator light indicates which mode is
selected. (See (e) Height control indicator lightº described
below.)
Selecting the HIº mode
Push the height select switch on the º side when the vehicle
speed is under about 30 km/h (19 mph).
To change the Nº mode to HIº: Push the switch once.
To change the LOº mode to HIº: Push the switch twice. It
takes about 30 seconds until the LOº mode changes to the HIº
mode.
Selecting the Nº mode
To change the HIº mode to Nº: Push the height select
switch on the º side once.
To change the LOº mode to Nº: Push the height select
switch on the º side once.
Selecting the LOº mode
Push the height select switch on the º side while the vehicle
is stopped.
To change the Nº mode to LOº: Push the switch once.
To change the HIº mode to LOº: 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.

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383
NOTICE
If the vehicle height is changed frequently when the
vehicle is heavily loaded, the compressor may
overheat causing the vehicle height adjustment
operation to stop.
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 vehicle equipped with
the rear height control air suspension becomes
slightly higher than the normal vehicle height. Take
sufficient care where the overhead height is
restricted.
Do not select the LOº mode in the bumpy roads. If
the underbody of the vehicle touches the rugged
road surface, the vehicle may be damaged.

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(d) Turning off the rear height control air
suspension
To turn off the rear height control air suspension with the
vehicle stopped, push the HEIGHT CONTROL OFFº
switch. The height control OFFº 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 OFFº 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 HEIGHT CONTROL OFFº switch, if the vehicle speed
exceeds 30 km/h (19 mph), the rear height control air
suspension automatically selects the Nº mode.
CAUTION
If you drive through deep water over about 700 mm (28
in.) in depth, put the vehicle height in the HIº mode with
the height select switch and then turn off the rear height
control air suspension by pushing the HEIGHT
CONTROL OFFº switch.

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NOTICE
When jacking up or installing tire chains, be sure to
turn off the rear height control air suspension with
the HEIGHT CONTROL OFFº switch and stop the
engine. Otherwise, the vehicle height may change
because of the automatic leveling function resulting
in accident.
If your vehicle must be towed, put the vehicle height
in the Nº mode and turn off the rear height control air
suspension. Otherwise, the vehicle height may
change because of the automatic leveling function
resulting in accident.
If your vehicle gets ditched, turn off the rear height
control air suspension with the HEIGHT CONTROL
OFFº switch. Otherwise, the vehicle height may
change because of the automatic leveling function
resulting in accident.