wheel Lexus GX470 2008 Operating the lights and windshield wipers / LEXUS 2008 GX470 (OM60D82U) Service Manual

117
2-1. Driving procedures
2
When driving
NOTICE
■Avoiding damage to vehicle parts
●Do not turn the steering wheel fully in either direction and hold it there for a long
time.
Doing so may damage the power steering pump.
●When driving over bumps in the road, drive as slowly as possible to avoid damag-
ing the wheels, underside of the vehicle, etc.
■If you hear a squealing or scraping noise (brake pad wear limit indicators)
Have your Lexus dealer check and replac e the brake pads as soon as possible.
The rotor damage can result if the pads are not replaced when needed.
■If you get a flat tire while driving
A flat or damaged tire may cause the following situations. Hold the steering wheel
firmly and gradually press the brak e pedal to slow down the vehicle.
●It may be difficult to control your vehicle.
●The vehicle will make abnormal sounds.
●The vehicle will behave abnormally.
Replace a flat tire with a new one. ( P. 3 9 1 )
■When encountering flooded roads
Do not drive on a road that has flooded after heavy rain etc. Doing so may cause the
following serious damage to the vehicle.
●Engine stalling
●Short in electrical components
●Engine damage caused by water immersion
In the event that you drive on a flooded road and the vehicle is flooded, be sure to
have your Lexus dealer check the following.
●Brake function
●Changes in quantity and quality of oil an d fluid used for the engine, transmission,
transfer, differentials, etc.
●Lubricant condition for the propeller shaft, bearings and suspension joints (where
possible) and the function of all joints, bearings, etc.

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2-1. Driving procedures
Engine (ignition) switch
■Turning the key from “ACC” to “LOCK”
■Engine (ignition) switch
“LOCK”:
The steering wheel is locked
and the key can be removed.
“A C C ” :
Some electrical components
such as the audio system can be
used.
“ON”:
All electrical components can
be used.
“START”:
For starting the engine.
■Starting the engine
Check that the parking brake is set.
Turn off unnecessary lights and accessories.
Check that the shift lever is set in “P”.
Sit in the driver’s seat and firmly depress the brake pedal.
Turn the engine switch to the “START” position to start the
engine.
STEP1
STEP2
STEP3
STEP4
STEP5
Shift the shift lever to “P”.
Push in the key and turn to the
“LOCK” position.STEP1
STEP2

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2-1. Driving procedures
2
When driving
■Steering lock release
■Starting the engine using the flat keyPut the key case away when the security indicator light goes out. This
means the engine immobilizer system has turned off.
Start the engine within 60 seconds after the security indicator light goes
off.
■Leak detection pump
Several hours after the engine is turned off, you may hear a sound coming from
underneath the luggage compartment for several minutes. This is normal operation
and does not indicate a malfunction.
When starting the engine, the engine switch
may seem stuck in the “LOCK” position. To
free it, turn the key while turning the steering
wheel slightly in either direction.
Remove the flat key from its case. Insert the
key into the engine switch.STEP1
Bring the key case close to the engine switch
within 10 seconds as indicated by an arrow.STEP2
STEP3
STEP4

146
2-4. Using other driving systems
Four-wheel drive system
Use the four-wheel drive control lever and center differential lock button
to select following transfer and center differential modes.
Four-wheel drive control lever
“L” (low speed position)
Driving requiring maximum power and traction such as climbing or
descending steep hills, off-road driving and hard pulling in sand or mud.
“N” (neutral position)
No power is delivered to the wheels.
“H” (high speed position)
Normal driving on all types of roads.

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2-4. Using other driving systems
2
When driving
■The four-wheel drive control lever can be operated when
●The engine switch is in the “ON” position,
●The shift lever is in the “N” position, and
●The vehicle is stopped completely.
Center differential lock/unlock buttonUse this button when your vehi-
cle’s wheel gets stuck in a ditch
or when you are driving on a
loose or bumpy surface.

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2-4. Using other driving systems
■The center differential lock/unlock button can be operated when
●The engine switch is in the “ON” position, and
●The four-wheel drive control lever is in the “H” or “L” position.
■Locking/unlocking the center differential
●When the center differential is locked, VSC is automatically turned off. (The
center differential lock and “VSC OFF” indicator lights come on.)
●If the operation is not completed, the center differential lock indicator blinks. If
the indicator light does not go off when unlocking the center differential, drive
straight ahead while accelerating or decelerating, or drive in reverse.
●If center differential lock system oper ation is not completed within 5 seconds
while the cruise control system is set, cancel the cruise control system.
CAUTION
■While driving
Never move the four-wheel drive control lever if the wheels are slipping. Doing so
may cause an accident resulting in death or serious injury.
NOTICE
■To prevent damage to the center differential
●Unlock the center differential after the wh eels are out of the ditch or off the loose
or bumpy surface.
●Do not push the center differential lock/u nlock button when the vehicle is corner-
ing or when its wheels are spin ning freely off the ground.

156
2-4. Using other driving systems
Electronic modulated suspension
■Driving mode
●Mode is suitable for ordinary driving.
●Mode or is suitable for heavy load or driving on a unpaved road.
●With the four-wheel drive control lever at “L”, the damping effect suitable for off-
road driving will be provided.
The electronic modulated suspension controls the suspension according to
the road and driving conditions. Selected driving mode allows for good
riding comfort and stability.
For driving on a bumpy road
For ordinary driving such as
in the city traffic
For moderate high speed
driving
For sporty type driving such
as on winding mountain
roads and high speed driving.
Soft Hard

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2-4. Using other driving systems
2
When driving
DAC (Downhill Assist Control system)
The DAC helps to prevent excessive speed on steep downhill slopes.
The system will operate when the vehicle is traveling under 15 mph
(25 km/h) and the four wheel drive control lever is in the “L” position.
■System operation
Press the “DAC” switch. The
indicator will come on, and the
system will operate.
When the system is in operation,
the slip indicator light will flash,
and the stop lights/high
mounted stop lights will be lit.
■Turning off the system
Press the “DAC” switch while the system is in operation. The indica-
tor will flash as the system gradua lly ceases operation, and will turn
off when the system is fully off.
Press the “DAC” switch while the indicator is flashing to start the
system again.

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2-4. Using other driving systems
■Operating tips
The system will operate when the shift lever is in a position other than “P”, however
to make effective use of the system it is recommended that the shift lever be shifted
to “2” or “L”.
■If the four wheel drive control lever is in “H”
The system will not operate.
■If the brake system overheats
The system will cease operation and a bu zzer will sound to alert the driver.
Stop the vehicle in a safe place. (There is no problem with continuing normal driv-
ing.)
■System malfunction
●The “DAC” indicator does not come on when the engine switch is turned to the
“ON” position.
●The “DAC” indicator does not come on when the “DAC” switch is pressed.
In the above cases have your vehicle checked by your Lexus dealer.
CAUTION
■The system may not operate on the following surfaces, which may lead to an acci-
dent causing death or serious injury.
●Slippery surfaces such as wet or muddy roads
●Icy surfaces
●Unpaved roads

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2-4. Using other driving systems
2
When driving
Driving assist systems
To help enhance driving safety and performance, the following systems
operate automatically in response to various driving situations. Be aware,
however, that these systems are supplementary and should not be relied
upon too heavily when operating the vehicle.
■ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenly, or if
the brakes are applied while driving on a slippery road surface.
■Brake Assist
Generates an increased level of braking force after the brake pedal is
depressed, when the system detects a panic stop situation.
■VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or turning on
slippery road surfaces.
■ Active traction control
Maintains drive power and prevents the 4 wheels from spinning when
starting the vehicle or accelerating on slippery roads.
■Hill-start assist control
Helps prevent the vehicle from rolling backwards when starting on an
incline or slippery slope. It operates for approximately 5 seconds at maxi-
mum.
■ Limited Slip Differential
Transfers drive power to the rear tires when front tires spin, and vice versa,
in order to improve traction.
■Kinetic Dynamic Suspension System (if equipped)
Kinetic Dynamic Suspension System helps to significantly enhance han-
dling response by reducing roll stiffn ess of the suspension stabilizer bars
through means of a hydraulic control system.