2006 Lexus GS300 transmission

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If the system malfunction is detected when dynamic radar
cruise control is in the “RADAR READY” mode or
operating, the above message appears.
If this message appears, stop your vehicle in a safe place, turn
the engine switch off, and then restart it to reset the system.
If the setting still cannot be made or the same message
appears again, the system might have malfunctioned.
Although it is no problem to continue driving, contact your
Lexus dealer.
NOTICE
While you are cruising with the dynamic radar cruise
control on, if the master warning light comes on, the
“CRUISE” indicator light flashes, “CHECK CRUISE
SYSTEM” appears on the multi−information display and
the warning tone sounds, turn the engine switch off and
then on again. If the function is cancelled again after
setting or if settings cannot be made, the dynamic radar
cruise control system may be malfunctioning.
Although it is no problem to continue driving, have your
vehicle checked by your Lexus dealer.
Conventional (fixed speed) cruise control
mode
This mode allows you to cruise at a desired speed over
about 45 km/h (28 mph) with your foot off the accelerator
pedal.
Cruising speed can be maintained, although a slight speed
change may occur when driving up or down a gradient, within
the limits of engine performance. On steeper hills, the speed
will change more radically so it is better to drive without cruise
control.
When cruise control is on, the driving pattern of the automatic
transmission is fixed in the normal mode, regardless of the
position of the selector switch.

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CAUTION
In the conventional (fixed speed) cruise control
mode, an approach warning does not activate even if
you are too close to the vehicle ahead, as neither the
presence of the vehicle ahead nor the
vehicle−to−vehicle distance is detected. Pay special
attention to the distance between your vehicle and
the vehicle ahead. Always confirm the setting in the
multi−information display.
The conventional (fixed speed) cruise control mode
of the dynamic radar cruise control should not be
used in the following conditions, which could result
in death or serious injury.
♦To help maintain maximum control of your vehicle,
do not use fixed speed control mode when using
dynamic radar cruise control while driving in
heavy or varying traffic, or on slippery (rainy, icy
or snow−covered) or winding roads.
♦Avoid vehicle speed increasing when driving
downhill. If the vehicle speed is too fast in relation
to the preset speed in the fixed speed control
mode, cancel the fixed control mode and then
downshift the transmission to use engine braking
to slow down.
(a) Turning the system on
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To operate conventional cruise control mode, push the
“ON−OFF” button. This turns the system on. The “CRUISE”
indicator light in the instrument cluster comes on and “RADAR
READY” appears on the multi−information display. Push the
control lever in the “MODE” direction for longer than 1 second
to change to conventional cruise control mode. The indicator
on the multi−information display is as shown. You can now set
your desired cruising speed. Pushing the “ON−OFF” button
again will turn the system completely off and “CRUISE OFF”
will appear on the multi−information display.
However, once the vehicle−to−vehicle distance control mode
activates and is used, it cannot be changed to the conventional
(fixed speed) cruise control mode using the above operation.
To change the mode, push the “ON−OFF” button to turn the
system off and then push it again to turn it on. Next push the
lever in the “MODE” direction for longer than about 1 second.

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414When the engine switch is turned off, the system is also
automatically turned off. To use the dynamic radar cruise
control again, push the “ON−OFF” button again to turn it on.
CAUTION
To avoid accidentally engaging cruise control , keep the
“ON−OFF” button off when not using dynamic radar
cruise control.
(b) Setting operation
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Each function is described below.
1
Setting the desired speed
The transmission must be in “D”, “6” (sixth range), “5” (fifth
range) or “4” (fourth range) before you set the cruise control
speed in the conventional cruise control mode of the dynamic
radar cruise control.
After bringing the vehicle to the desired speed, press the
control lever downward in the “– SET” direction and release it.
This sets the vehicle at that speed and the multi−information
display shows the preset speed. At this time, you may take
your foot off the accelerator pedal. If you need to accelerate
− for example, when passing − depress the accelerator pedal
enough for the vehicle to exceed the preset speed. When you
release the accelerator pedal, the vehicle will return to the
speed set prior to acceleration.

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3
Resetting to a faster speed
Press the control lever upward in the “+ RES” 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 “+ RES” direction quickly within 0.6
seconds.
A quicker way to reset the speed is to accelerate and then
press the control lever downward in the “– SET” direction. 4
Resetting to a slower speed
Press the control lever downward in the “– SET” 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 “– SET” direction quickly within 0.6
seconds.
A quicker way to reset the preset speed is to depress the brake
pedal and then press the control lever downward in the “– SET”
direction.
Even if you downshift the transmission from the “D” or “6” (sixth
range) to “5” (fifth range), or from “D” or “5” (fifth range) to “4”
(fourth range) in the conventional cruise control mode, engine
braking will not be applied because this mode is not cancelled.
To slow down, reset the cruise control to a slower speed with
the cruise control lever or depress the brake pedal. If you use
the brake pedal, cruise control is cancelled.