engine Lexus GX470 2004 Audio System / LEXUS 2004 GX470 FROM NOV. 2003 THROUGH DEC. 2003 PROD. (OM60A74U) Service Manual

AUDIO
299 You can enjoy the rear seat entertainment system with
commercial headphone. See Headphone input jacksº on
page 356 in this Section for details.
You can also enjoy the rear seat entertainment system with a
wireless headphone. The wireless headphone can be used
within rear seat. If the signal becomes weak, the headphone
will mute. For details, refer to the manufacturer's instructions.
With some wireless headphone generally available in the
market, it may be difficult to catch sound properly. Lexus
recommends the use of Lexus genuine wireless headphone.
You can purchase a wireless headphone at a Lexus dealer.
CAUTION
Do not drive with using the headphone. Otherwise,
you may be hard to hear the sound from the outside
while using the headphone and may cause an
accident.
With DVD player:
Conversational speech on some DVDs is recorded at
a low volume to emphasize the impact of sound
effects. If you adjust the volume assuming that the
conversations represent the maximum volume level
that the DVD will play, you may be startled by louder
sound effects or when you change to a different
audio source. Be sure to adjust the volume with this
in mind.
Make sure the volume is not increased, before you
turn on the headphone.
NOTICE
To prevent the battery from being discharged, do not
leave the car audio on longer than necessary when the
engine is not running.

AUDIO
352Audio: This DVD player can play liner PCM, Dolby digital, dts
and MPEG audio format DVD. Other decoded type cannot be
played.
Title and chapter: Video and audio programs stored on DVD
video discs are divided in parts by title and chapter.
Title: The largest unit of the video and audio programs stored
on DVD video discs. Usually, one piece of a movie, one album,
or one audio program is assigned as a title.
Chapter: A unit smaller than a title. A title comprises plural
chapters.
Manufactured under license from Dolby Laboratories.
Dolbyº, Pro Logicº, and 
º are trademarks of Dolby
Laboratories. Confidential unpublished works.
1992 Ð 1997 Dolby Laboratories. All rights reserved.
This product incorporates copyright protection
technology that is protected by method claims of certain
U.S. patents and other intellectual property rights owned
by Macrovision Corporation and other rights owners. Use
of this copyright protection technology must be
authorized by Macrovision Corporation, and is intended
for home and other limited viewing uses only unless
otherwise authorized by Macrovision Corporation.
Reverse engineering or disassembly is prohibited.
dtsº is a trademark of Digital Theater Systems, Inc.
Input terminal adapter
The rear entertainment system plays videos and sound when
your audio system is connected to the input terminal adapter
on the rear console box. For details, refer to the
manufacturer's instructions.
To use the input terminal adapter, push the lid.

AUDIO
355
NOTICE
To prevent the battery from being discharged, do not
use the power outlet longer than necessary when the
engine is not running.
Close the power outlet lid when the power outlet is
not in use. Inserting a foreign object other than the
appropriate plug that fits the outlet may cause
electrical failure or short circuit.

SECTION 3 ± 1
366
STARTING AND DRIVING
Starting and driving
Three-way catalytic converters367 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine exhaust caution370 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before starting the engine372 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition switch with steering lock372 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking brake374 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to start the engine374 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic transmission376 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Four-wheel drive system384 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear view monitor system388 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise control392 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear height control air suspension395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic modulated suspension402 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Active traction control system403 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle stability control system405 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downhill assist control system408 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hill-start assist control system411 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system413 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire pressure warning system417 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake pad wear limit indicators426 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limited-slip differential427 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STARTING AND DRIVING
367
THREE-W AY CATALYTIC
CONVERTERSThree-way catalytic converters are emission control
devices installed in the exhaust system.
The purpose is to reduce pollutants in the exhaust gas.
CAUTION
Keep people and combustible materials away from
the exhaust pipe while the engine is running. The
exhaust gas is very hot.
Do not drive, idle or park your vehicle over anything
that might burn easily such as grass, leaves, paper or
rags.

STARTING AND DRIVING
368
NOTICE
A large amount of unburned gases flowing into the
three-way catalytic converter may cause it to overheat
and create a fire hazard. To prevent this and other
damage, observe the following precautions:
Use only unleaded gasoline.
Do not drive with an extremely low fuel level; running
out of fuel could cause the engine to misfire, creating
an excessive load on the three-way catalytic
converter.
Do not allow the engine to run at idle speed for more
than 20 minutes.
Avoid racing the engine.
Do not push-start or pull-start your vehicle.
Do not turn off the ignition while the vehicle is
moving.
Keep your engine in good running order.
Malfunctions in the engine electrical system, electric
ignition system or fuel system could cause an
extremely high three-way catalytic converter
temperature.
If the engine becomes difficult to start or stalls
frequently, take your vehicle in for a check-up as
soon as possible. Remember, your Lexus dealer
knows your vehicle and its three-way catalytic
converter system best.

STARTING AND DRIVING
370
ENGINE EXHAUST CAUTIONCAUTION
Avoid inhaling the engine exhaust. It contains
carbon monoxide, which is a colorless and odorless
gas. It can cause unconsciousness or even death.
Make sure the exhaust system has no holes or loose
connections. The system should be checked from
time to time. If you hit something, or notice a change
in the sound of the exhaust, have the system checked
immediately.
Do not run the engine in a garage or enclosed area
except for the time needed to drive the vehicle in or
out. The exhaust gases cannot escape, making this
a particularly dangerous situation.
Do not remain for a long time in a parked vehicle with
the engine running. If it is unavoidable, however, do
so only in an unconfined area and adjust the heating
or cooling system to force outside air into the vehicle.
Keep the back door closed while driving. An open or
unsealed back door may cause exhaust gases to be
drawn into the vehicle.

STARTING AND DRIVING
372
BEFORE STARTING THE ENGINE
1. Check the area around the vehicle before entering it.
2. Adjust seat position, seatback angle, head restraint height
and steering wheel angle.
3. Adjust the inside and outside rear view mirrors.
4. Lock all doors.
5. Fasten seat belts.
Remember to check that the service reminder indicators
function when turning the key to ONº, and check the fuel
gauge to see that you have sufficient fuel.
IGNITION SWITCH WITH STEERING
LOCK
STARTº Ð Starter motor on. The key will return to the
ONº position when released.
For starting tips, see page 374.
It is not a malfunction even if the needle of the tachometer, fuel
gauge or engine coolant temperature gauge returns to the
bottom position when the ignition switch is turned to the
STARTº position.
ONº Ð Engine on and all accessories on.
This is the normal driving position.
It is not malfunction even if the needle on the speedometer may
move when the ignition switch is turned to the ONº position.

STARTING AND DRIVING
373
NOTICE
Do not leave the key in the ONº position if the engine
is not running. The battery will discharge and the
electronic ignition system could be damaged.
ACCº Ð Accessories such as the radio operate, but the
engine is off.
If you leave the key in the ACCº or LOCKº position and open
the driver's door, a buzzer will remind you to remove the key.
LOCKº Ð Engine is off and the steering wheel is locked.
The ignition key can be removed only at this position.
To turn the key from ACCº to the LOCKº position, you must
put the transmission selector lever in the Pº position.
Once you remove the key, the engine immobilizer system is
automatically set. See Engine immobilizer systemº on page
14.
When starting the engine, the key may seem stuck at the
LOCKº position. To free it, first be sure the key is pushed all
the way in, and then rock the steering wheel slightly while
turning the key gently.
If, in an emergency, you must turn the engine off while the
vehicle is moving, turn the key only to ACCº.

STARTING AND DRIVING
374
PARKING BRAKE
To set: Pull up the lever. For better holding power, first
depress the brake pedal and hold it while setting the
parking brake.
To release: Pull up the lever slightly (
1), press the lock
release button (2), and lower the lever (3).
Before leaving your vehicle, firmly apply the parking brake. For
better holding power, first depress the brake pedal and hold it
while setting the parking brake.
CAUTION
Before driving, make sure the parking brake is fully
released and that the parking brake reminder light is off.
HOW TO START THE ENGINE
Cranking hold function
Once you turn the ignition key to STARTº position and release
it, the cranking hold function continues to crank the engine in
ONº position until it starts.
The function stops cranking the engine after about 25 seconds
maximum if the engine has not started yet. When you crank
the engine again, wait a few seconds and restart it.
If you hold the key in STARTº position, the function will keep
cranking for about 30 seconds maximum.
Before cranking
1. Apply the parking brake firmly.
2. Turn off unnecessary lights and accessories.
3. Put the selector lever in Pº. If you need to restart the engine
while the vehicle is moving, put the selector lever in Nº. A
starter safety device will prevent the starter from operating if
the selector lever is in any drive position.
4. Depress the brake pedal and hold it to the floor until driving
off.