2015 Lexus GX460 transmission

GX460_OM_OM60L72U_(U)
1934-2. Driving procedures
4
Driving
■Driving on a downhill
On declines, there may be case where the vehicle shifts down automatically to obtain
engine braking. As a result of the down shifting, the engine speed may increase.
■Second start mode automatic deactivation
Second start mode is automatically deactivated if the engine is turned off after driving in
second start mode.
■S mode
When the shift range is 5 or lower, holding th e shift lever toward “+” sets the shift range to
6.
■AI-SHIFT
AI-SHIFT automatically shifts the gear to the suitable position according to driver perfor-
mance and driving conditions.
AI-SHIFT automatically operates when the shift lever is in the D position. (Shifting the
shift lever to the S position cancels the function.)
■When driving with the cruise control or dynamic radar cruise control
Engine braking will not occur in S mode, even when downshifting to 5 or 4.
(  P. 218, 221)
■If the shift lever cannot be shifted from P
 P. 5 4 8
■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 your Lexus dealer immediately.
(In this situation, the transmission will operat e in the same manner as when the shift lever
is in D.)
■Downshift restriction warning buzzer (S mode)
To help ensure safety and driving performa nce, downshifting operation may sometimes
be restricted. In some circumstances, downshifting may not be possible even when the
shift lever is operated. (A buzzer will sound twice.)
CAUTION
■When driving on slippery road surfaces
Do not accelerate or shift gears suddenly.
Sudden changes in engine braking may cause th e vehicle to spin or skid, resulting in an
accident.

GX460_OM_OM60L72U_(U)
3054-5. Using the driving support systems
4
Driving
■The Multi-terrain Select can be operated when
The Crawl Control is off.
■When using Multi-terrain Select
The following functions cannot be switched on or off.
●VSC
●Active TRAC
●Second start mode
A message will be shown on the multi-inform ation display stating that these functions
cannot be switched using the VSC OFF swit ch or the menu and “ENTER” switches.
■When selecting a terrain mode
If you are unsure which mode is appropriate, select MOGUL when the four-wheel drive
control switch is in L4 or select MUD & SAND when it is in H4.
Guidance DisplayVehicle StatusProcedure
SHIFT TO L4LOOSE ROCK, MOGUL or ROCK
mode is selected when the four-wheel
drive control switch is in H4Set the four-wheel
drive control switch to
L4
STOP THE VEHI-
CLE AND SHIFT
THE AUTO-
MATIC TRANS-
MISSION TO NThe four-wheel drive control switch
has been shifted to H4 or L4 and
LOOSE ROCK, MOGUL or ROCK
mode is selected, but the automatic
transmission is not in N position or the
vehicle is not stopped
Stop the vehicle com-
pletely and shift the
shift lever into N
ACCELER ATE OR
DECELERATE
The center differential lock/unlock
switch is pressed when Multi-terrain
Select is operating, but the center dif-
ferential cannot be switched between
lock and unlockDrive straight ahead
while accelerating or
decelerating, or drive
in reverse
RETURN THE
FOUR-WHEEL
DRIVE CON-
TROL SWITCHThe four-wheel drive control switch is
shifted when Multi-terrain Select is
operating, but the transfer cannot be
shifted to H4 or L4 positionReturn the four-wheel
drive control switch to
L4 or H4
MULTI-TERRAIN
SELECT NOT
AVA I L A B L EThe VSC, EFI, 4WD and/or Multi-ter-
rain Select system may be malfunc-
tioningContact your Lexus
dealer

342
GX460_OM_OM60L72U_(U)4-5. Using the driving support systems
■When the Crawl Control system is operated continuously
This may cause the brake actuator to overheat. In this case, the Crawl Control system will
stop operating, a buzzer will sound, the Crawl
Control indicator will turn off after flashing
and the “TRAC OFF” will be shown on the mult i-information display. In this case, quickly
stop the vehicle in a safe place and give the actuator adequate time to cool off. Refrain
from using the system until the message goes off. (The vehicle can be driven normally
during this time.)
■If the automatic transmission system overheats
The system will cease operation, a buzzer will sound and a warning message will be dis-
played to alert the driver. Stop the vehicle in a safe place until the warning message turns
off. ( P. 5 2 4 )
■Sounds and vibrations caused by the Crawl Control system
●A sound may be heard from the engine compartment when the engine is started or just
after the vehicle begins to move. This sound does not indicate that a malfunction has
occurred in Crawl Control system.
●Either of the following conditions may occu r when the Crawl Control system is operat-
ing. None of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■If the slip indicator comes on...
It may indicate a malfun ction in the system. Consult your Lexus dealer.
CAUTION
■When using Crawl Control
Do not rely solely on the Crawl Control. This function does not extend the vehicle’s
performance limitations. Always thoroughly check the road conditions, and drive
safely.
■These conditions may cause the system not to operate properly
When driving on the following surfaces, the sy stem may not be able to maintain a fixed
low speed, which may re sult in an accident:
●Extremely steep inclines.
●Extremely uneven surfaces.
●Snow-covered roads, or other slippery surfaces.

378
GX460_OM_OM60L72U_(U)4-6. Driving tips
NOTICE
■To prevent the water damage
Take all necessary safety measures to ensure
that water damage to the engine or other
components does not occur.
●Water entering the engine air intake will cause severe engine damage.
●Water entering the automatic transmission will cause deterioration in shift quality,
locking up of your transmission accompan ied by vibration, and ultimately damage.
●Water can wash the grease from wheel be arings, causing rusting and premature fail-
ure, and may also enter the differentials, tr ansmission and transfer case, reducing the
gear oil’s lubricating qualities.
■When you drive through water
If driving through water, such as when crossing shallow streams, first check the depth of
the water and the bottom of the riverbed for firmness. Drive slowly and avoid deep
water.
■Inspection after off-road driving
●Sand and mud that has accumulated in brake drums and around brake discs may
affect braking efficiency and may damage brake system components.
●Always perform a maintenance inspection after each day of off-road driving that has
taken you through rough terr ain, sand, mud, or water. For scheduled maintenance
information, refer to the “Warranty and Services Guide”, “Owner’s Manual Supple-
ment” or “Scheduled Maintenance”.

448
GX460_OM_OM60L72U_(U)6-2. Maintenance
Vehicle interior
ItemsCheck points
Accelerator pedal• The accelerator pedal should move smoothly
(without uneven pedal effort or catching).
Automatic transmission
“Park” mechanism• When parked on a slope and the shift lever is in P, isthe vehicle securely stopped?
Brake pedal
• Does the brake pedal move smoothly?
• Does the brake pedal have appropriate clearance
from the floor? ( P. 5 6 9 )
• Does the brake pedal have the correct amount of
free play? ( P. 5 6 9 )
Brakes
• The vehicle should not pull to one side when the
brakes are applied.
• The brakes should work effectively.
• The brake pedal should not feel spongy.
• The brake pedal should not get too close to the floor when the brakes are applied.
Head restraints• Do the head restraints move smoothly and lock
securely?
Indicators/buzzers• Do the indicators and buzzers function properly?
Lights• Do all the lights come on?
• Are the headlights aimed correctly? ( P. 488)
Parking brake• Does the parking brake pedal move smoothly?
• When parked on a slope and the parking brake is on,
is the vehicle securely stopped?
Seat belts•Do the seat belt s operate smoothly?
• The seat belts should not be damaged.
Seats• Do the seat controls operate properly?
Steering wheel
• Does the steering wheel rotate smoothly?
• Does the steering wheel have the correct amount of free play?
• There should not be an y strange sounds coming
from the steering wheel.

452
GX460_OM_OM60L72U_(U)6-3. Do-it-yourself maintenance
Headlight aim
(
 P. 4 8 8 )• Phillips-head screwdriver
Light bulbs
( P. 4 9 0 )
• Bulb with same number and wattage rating as original
• Phillips-head screwdriver•Flathead screwdriver
•Wrench
Power steering fluid
level ( P. 4 6 3 )• Automatic transmission fluid DEXRON® II or III
•Rag or paper towel•Clean funnel
Radiator and con-
denser ( P. 4 6 1 )
Tire inflation pres-
sure (P. 4 7 5 )•Tire pressure gauge• Compressed air source
Wa s h e r f l u i d
( P. 4 6 7 )• Water or washer fluid containi ng antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)
ItemsPa r t s a n d t o o l s

GX460_OM_OM60L72U_(U)
4636-3. Do-it-yourself maintenance
6
Maintenance and care
■Fluid level
The fluid level should be within the appropriate range.Full (when cold)
Add fluid (when cold)
Full (when hot)
Add fluid (when hot)
Hot: The vehicles has been driven around 50 mph (80 km/h) for 20 min- utes, or slightly longer in frigid temperatures.
(Fluid temperature, 140 F - 175 F [60 C - 80 C]).
Cold: The engine has not been run for about 5 hours. (Room temperature, 50 F - 85 F [10 C - 30 C]).
■Checking the fluid level
Make sure to check the fluid type and prepare the necessary items.
Clean all dirt off the reservoir.
Remove the cap by turnin g it counterclockwise.
Wipe the dipstick clean.
Reinstall the cap and remove it again.
Check the fluid level.
Power steering fluid
1
2
3
4
Fluid typeAutomatic transmission fluid DEXRON® II or III
ItemsRag or paper, clean funnel (only for adding fluid)
1
2
3
4
5

504
GX460_OM_OM60L72U_(U)7-2. Steps to take in an emergency
If your vehicle needs to be towed
The following may indicate a problem with your transmission. Contact your
Lexus dealer or commercial towing service before towing.
●The engine is running but the vehicle will not move.
●The vehicle makes an abnormal sound.
If towing is necessary, we recommend having your vehicle towed by your
Lexus dealer or commercial towing service, using a lift-type truck or flatbed
truck.
Use a safety chain system for all towing, and abide by all state/provincial and
local laws.
Situations needs to contact dealers before towing