Lexus GX460 2010 Scheduled Maintenance Guide / LEXUS 2010 GX460 OWNERS MANUAL (OM60E69U)

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2-1. Driving procedures
2
When driving
GX460_U.S.A. (OM60E69U)
■Changing “ENGINE START STOP” switch modes
Modes can be changed by pressing the “ENGINE START STOP”
switch with brake pedal released. (The mode changes each time the
switch is pressed.)
Off
*
The emergency flashers can be
used.
ACCESSORY mode
Some electrical components
such as the audio system can be
used.
The “ENGINE START STOP”
switch indicator turns amber.
IGNITION ON mode
All electrical components can
be used.
The “ENGINE START STOP”
switch indicator turns amber.
*: If the shift lever is in a position other than P when turning off
the engine, the “ENGINE
START STOP” switch will be
turned to ACCESSORY mode,
not to OFF.

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2-1. Driving procedures
GX460_U.S.A. (OM60E69U)
When stopping the engine with the shift lever in a position other than PIf the engine is stopped with the shift lever in a position other than P, the
“ENGINE START STOP” switch will not be turned off but instead be
turned to ACCESSORY mode. Perform the following procedure to turn
the switch off:
Check that the parking brake is set.
Shift the shift lever to P.
Check that the indicator on th e “ENGINE START STOP” switch
is illuminated in amber and then press the “ENGINE START
STOP” switch once.
Check that the indicator on th e “ENGINE START STOP” switch
is off.
■Auto power off function
If the vehicle is left in ACCESSORY or IGNITION ON mode (the engine is not
running) for more than an hour with the shift lever in P, the “ENGINE START STOP”
switch will automatically turn off. However, this function cannot entirely prevent bat-
tery discharge. Do not leave the vehicle with the “ENGINE START STOP” switch in
ACCESSORY or IGNITION ON mode for long periods of time when the engine
is not running.
■Operation of the “ENGINE START STOP” switch
When operating the “ENGINE START STOP” switch, one short, firm press is
enough. If the switch is pressed improperly, the engine may not start or the
“ENGINE START STOP” switch mode may not change. It is not necessary to press
and hold the switch.
STEP1
STEP2
STEP3
STEP4

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2-1. Driving procedures
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When driving
GX460_U.S.A. (OM60E69U)
■Electronic key battery depletion
P. 4 5
■Conditions affecting operation
P. 4 0
■Notes for the entry function
P. 4 2
■If the engine does not start
The engine immobilizer system may not have been deactivated. ( P. 114)
■Steering lock
After turning the “ENGINE START STOP” switch off and opening and closing the
doors, the steering wheel will be locked due to the steering lock function. Operat-
ing the “ENGINE START STOP” switch again automatically cancels the steering
lock.
■When the steering lock cannot be released
The green indicator light on the “ENGINE
START STOP” switch will flash and a mes-
sage will be shown on the multi-information
display. Press the “ENGINE START STOP”
switch again while turning the steering wheel
left and right.

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2-1. Driving procedures
GX460_U.S.A. (OM60E69U)
■Steering lock motor overheating prevention
To prevent the steering lock motor from overheating, the motor may be suspended
if the engine is turned on and off repeatedly in a short period of time. In this case,
refrain from operating the engine. After about 10 seconds, the steering lock motor
will resume functioning.
■When the “ENGINE START STOP” switch indicator flashes in amber
The system may be malfunctioning. Have the vehicle inspected by your Lexus
dealer immediately.
■If the electronic key battery is depleted
 P. 6 4 2
CAUTION
■When starting the engine
Always start the engine while sitting in th e driver’s seat. Do not depress the acceler-
ator pedal while starting the engine under any circumstances. 
Doing so may cause an accident resu lting in death or serious injury.
■Caution while driving
If the vehicle begins to slide due to engine failure or other circumstances, do not
lock or open the doors until the vehicle reaches a safe and complete stop. Activa-
tion of the steering lock in this circumstance may lead to an accident, resulting in
death or serious injury.
■Stopping the engine in an emergency
If you want to stop the engine in an emergency while driving the vehicle, press and
hold the “ENGINE START STOP” switch for more than 3 seconds. 
However, do not touch the "ENGINE START STOP" switch while driving except in
an emergency. Turning the engine off while dr iving will not cause loss of steering or
braking control, but the power assist to thes e systems will be lost. This will make it
more difficult to steer and brake, so you should pull over and stop the vehicle as
soon as it is safe to do so.

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2-1. Driving procedures
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When driving
GX460_U.S.A. (OM60E69U)
NOTICE
■To prevent battery discharge
●Do not leave the “ENGINE START STOP” switch in ACCESSORY or IGNI-
TION ON mode for long periods of time without the engine running.
●If the indicator on the “ENGINE START STOP” switch is illuminated, the
“ENGINE START STOP” switch is not off. When exiting the vehicle, always
check that the “ENGINE START STOP” switch is off.
●Do not stop the engine when the shift lever is in a position other than P. If the
engine is stopped in another shift lever position, the “ENGINE START STOP”
switch will not be turned off but instead be turned to ACCESSORY mode. If the
vehicle is left in ACCESSORY mode, battery discharge may occur.
■When starting the engine
●Do not race a cold engine.
●If the engine becomes difficult to start or stalls frequently, have the engine
checked immediately.
■Symptoms indicating a malfunction with the “ENGINE START STOP” switch
If the “ENGINE START STOP” seems to be operating somewhat differently than
usual, such as the switch sticking slightly, there may be a malfunction. Contact your
Lexus dealer immediately.

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2-1. Driving procedures
GX460_U.S.A. (OM60E69U)
Automatic transmission
Select a shift position appropriate for the driving conditions.
■Shifting the shift lever
While the “ENGINE START STOP” switch is in IGNITION
ON mode, move the shift lever wi th the brake pedal depressed.
When shifting the shift lever betw een P and D, make sure that
the vehicle is completely stopped.

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2-1. Driving procedures
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When driving
GX460_U.S.A. (OM60E69U)
■Shift position purpose
*1: To improve fuel efficiency 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.
Shift positionFunction
PParking the vehicle/starting the engine
RReversing
NNeutral
DNormal driving*1
SS mode driving*2 (  P. 1 8 9 )

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2-1. Driving procedures
GX460_U.S.A. (OM60E69U)
■Selecting second start mode
Use second start mode for accelerating and driving on slippery
road surfaces such as snow.
Press the menu switch.
The multi-information display
will change modes to electronic
features control mode.
Press the “ENTER” switch
upwards or downwards until
“2ND START” appears.
Press the “ENTER” switch to
change to “ON”. 
The “2nd STRT” indicator will be
displayed.
Each pressing of the switch
turns second start mode on and
off.
Press the menu switch to
change to the normal display.
STEP1
STEP2

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2-1. Driving procedures
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When driving
GX460_U.S.A. (OM60E69U)
Changing shift ranges in S modeWhen the shift lever is in the S position, the shift lever can be operated as
follows: For upshifting
For downshifting
The initial shift range in S mode is set automatically to 5 or 4 according to
vehicle speed. However, the initial shift range may be set to 3 or 2 if AI-
SHIFT has operated while the shift lever was in the D position. 
( P. 190)
■ Shift ranges and their functions
●You can choose from 6 levels of engine braking force.
● A lower shift range will provide gr eater engine braking force than a
higher shift range, and the engi ne speed will also increase.

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2-1. Driving procedures
GX460_U.S.A. (OM60E69U)
■S mode
When the shift range is 5 or lower, holding the shift lever toward “+” sets the shift
range to 6.
■AI-SHIFT
AI-SHIFT automatically selects the optimal gear according to driver performance
and driving conditions.
AI-SHIFT automatically operates when the shift lever is in the D position. (Shifting
the shift lever to the S posi tion cancels the function.)
■When driving with the cruise contro l or dynamic radar cruise control
Engine braking will not occur in S mode, even when downshifting to 5 or 4. 
(  P. 242, 246)
■If the shift lever cannot be shifted from P
P. 7 3 6
■If the “S” indicator does not come on ev en after shifting the shift lever to S
This may indicate a malfunction in the automatic transmission system. Have the
vehicle inspected by Lexus dealer immediately. 
(In this situation, the transmission will operate in the same manner as when the shift
lever is in D.)
■Downshift restriction warning buzzer (S mode)
To help ensure safety and driving perfor mance, downshifting operation may some-
times be restricted. In some circumstances, downshifting may not be possible even
when the shift lever is operated. (A buzzer will sound twice.)