2008 Lexus IS250 engine

122
2-1. Driving procedures
08_IS350/250_U_(L/O_0708)
Automatic Transmission (if equipped)
Select a shift position appropriate for the driving conditions.
■Shifting the shift lever
While the “ENGINE
START STOP” switch is
in IGNITION ON
mode, depress the brake
pedal and move the shift
lever.

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2-1. Driving procedures
2
When driving
08_IS350/250_U_(L/O_0708)
■Shift position uses
*1: To improve fuel consumption and reduce noises, set the shift lever in the D
position for normal driving.
*2: Selecting shift ranges using S mode re stricts the upper limit of the possible
gear ranges, controls engine brakin g forces, and prevents unnecessary
upshifting.
■ Selecting a driving mode
The following patterns can be selected to suit current driving and
operating conditions.
Power mode
For powerful acceleration
and driving in mountainous
regions.
Normal mode
Snow mode
For accelerating and driving
on slippery road surfaces,
such as on snow.
Press “SNOW” to return to nor-
mal mode.
Shift positionFunction
PParking the vehicle or starting the engine
RReversing
NNeutral
DNormal driving*1
SS mode driving*2 (→P. 1 2 4 )

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2-1. Driving procedures
08_IS350/250_U_(L/O_0708)
Changing shift ranges in S modeShift the shift lever to the S position and operate the shift lever or shift
paddle switch. Upshifting
Downshifting
The initial shift range in S mode is automatically set to 5 or 4 according to
vehicle speed. However, the initial shift range may be set to 3 or 2 if the
AI-SHIFT has operated while the sh ift lever was in the D position.
(→P. 125)
■ Shift ranges and their functions
A lower shift range will provide greater engine braking forces than a higher shift
range.
Shift rangeFunction
6Automatically selecting gears between 1 and 6
according to vehicle speed and driving conditions.
5Automatically selecting gears between 1 and 5
according to vehicle speed and driving conditions.
4Automatically selecting gears between 1 and 4
according to vehicle speed and driving conditions.
3Automatically selecting gears between 1 and 3
according to vehicle speed and driving conditions.
2Automatically selecting gears between 1 and 2
according to vehicle speed and driving conditions.
1Setting the gear at 1.

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2-1. Driving procedures
2
When driving
08_IS350/250_U_(L/O_0708)
■Gear position display when driving in S mode
The current gear is displayed on the multi-information display. (
→P. 1 4 2 )
■Downshifting restrictions warning buzzer (in the S mode)
To help ensure safety and driving performance, downshifting operation may some-
times be restricted. In some circumstances, downshifting may not be possible even
when the shift lever or shift paddle switch is operated. (The warning buzzer will
sound twice.)
■When driving with the cruise control system or dynamic radar cruise control sys-
tem
The engine brake will not operate in the S mode, even when downshifting to 5 or 4.
(
→P. 152, 155)
■Snow mode automatic deactivation
Snow mode is automatically deactivated if the “ENGINE START STOP” switch is
turned off after driving in snow mode.
■If the shift lever cannot be shifted from P
→P. 3 9 2
■If does not come on even after shifting the shift lever to S
This may indicate a malfunction in the automatic transmission system. Have the
vehicle inspected by your Lexus dealer immediately.
(In this situation, the vehicle will operate as if the shift lever is in D.)
■AI-SHIFT
The AI-SHIFT automatically shifts the gear to the optimal position according to the
driver performance and driving conditions.
The AI-SHIFT automatically operates when the shift lever is in the D position. (Shift-
ing the shift lever to the S position cancels the function.)

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2-1. Driving procedures
2
When driving
08_IS350/250_U_(L/O_0708)
■Maximum downshifting speed
Adhere to the downshifting speeds in the following table in order to prevent over-
revving the engine. mph (km/h)
Shift positionMaximum speed
133 (54)
256 (90)
383 (134)
4108 (172)

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2-1. Driving procedures
08_IS350/250_U_(L/O_0708)
Turn signal lever
■Turn signals can be operated when
The “ENGINE START STOP” switch is in IGNITION ON mode.
■If the indicators flash faster than usual
Check that a light bulb in the front or rear turn signal lights has not burned out.
Left turn
Right turn
Move and hold the lever part-
way to signal a lane change
The left hand signal will flash
until you release the lever.
Move and hold the lever part-
way to signal a lane change
The right hand signal will flash
until you release the lever.

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08_IS350/250_U_(L/O_0708)
2-2. Instrument cluster
Gauges and meters
The units used on the speedometer and the tachometer gauge display may
differ depending on the model/type.

The following gauges, meters and display illuminate when the
“ENGINE START STOP” switch is in IGNITION ON mode.Speedometer
Displays the vehicle speed.
Multi-information display
→P. 1 3 9
Tachometer
Displays the engine speed in revolutions per minute.
Tacho indicator
When the set engine speed is reached, this ring-shaped indicators comes
on in yellow. The indicator comes on in red when the engine speed
reaches a dangerous range.
Engine coolant temperature gauge
Displays the engine coolant temperature.

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2-2. Instrument cluster
2
When driving
08_IS350/250_U_(L/O_0708)■
Changing the indicator setting
The satellite switch can be used to change the set speed at which the
yellow speed or tacho indicator ring comes on.
The setting can be made only when the “ENGINE START STOP”
switch is in IGNITION ON mode and the vehicle is stopped.
Push
< or > to select the speed or tacho indicator set mode. ( ) Turn the
speed or tacho indicator to “OFF” and then “ON” by pushing the “ON/
OFF” button. ( )
After one second, the mode enters
the indicator setting mode.
The speedometer or tachometer
needle moves to the previously set
speed.
STEP1