ECU Lexus GX470 2004 Audio System / LEXUS 2004 GX470 FROM JAN. 2004 THROUGH JUL. 2004 PROD. OWNER'S MANUAL (OM60A87U)

IMPORTANT INFORMATION ABOUT YOUR LEXUS
ii
IMPORTANT INFORMATIONABOUT YOUR LEXUS
Occupant restraint systems
Lexus encourages you and your family to take the time to read
Section 1-6 of this Owner's Manual carefully. In terms of
helping you understand how you can receive the maximum
benefit of the occupant restraint systems this vehicle provides,
Section 1-6 of this Owner's Manual is the most important
Section for you and your family to read.
Section 1-6 describes the function and operation concerning
seats, seat belts, SRS airbags and child restraint systems of
this vehicle and some potential hazards you should be aware
of. These systems work together along with the overall
structure of this vehicle in order to provide occupant restraint
in the event of a crash. The effect of each system is enhanced
when it is used properly and together with other systems. No
single occupant restraint system can, by itself, provide you or
your family with the equal level of restraint which these
systems can provide when used together. That is why it is
important for you and your family to understand the purpose
and proper use of each of these systems and how they relate
to each other. The purpose of all occupant restraint systems is to help reduce
the possibility of death or serious injury in the event of a
collision. None of these systems, either individually or
together, can ensure that there is no injury in the event of
collision. However, the more you know about these systems
and how to use them properly, the greater your chances
become of surviving an accident without death or serious
injury.
Seat belts provide the primary restraint to all occupants of the
vehicle, and every occupant of the vehicle should wear seat
belts
properly at all times. Children should always be secured
in child restraint systems that are appropriate for their age and
size. SRS (Supplemental Restraint System) airbags are, as
their names imply, designed to work with, and be supplemental
to, seat belts and are not substitutes for them. SRS airbags
can be very effective in reducing the risk of head and chest
injuries by preventing contact of the head and chest with
interior portions of the vehicle.
In order to be effective, the SRS airbags must deploy with
tremendous speed. The rapid deployment of the SRS airbags
makes the SRS airbags themselves potential sources of injury
if an occupant is too close to an airbag, or if an object or some
part of his or her body has been placed between the occupant
and the airbag at the time of deployment. This is just one
example of how the instructions in Section 1-6 of this Owner's
Manual will help ensure proper use of the occupant restraint
systems, and increase the safety they can provide to you and
your family in the event of an accident.
Lexus recommends you to read the provisions in Section 1-6
carefully and refer to them from time to time during your time
of ownership of this vehicle.

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xiv
Page
1Automatic transmission second start indicator light 386 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Unengaged Parkº warning light 59
. . . . . . . . . . . . . . .
3Automatic transmission fluid temperature
warning light 59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Low washer fluid warning light 63
. . . . . . . . . . . . . . . . .
5Automatic transmission indicator lights 378 . . . . . .
6Driver's seat belt reminder light 55
. . . . . . . . . . . . . . . .
7Turn signal indicator light 36
. . . . . . . . . . . . . . . . . . . . .
8Brake system warning light 54
. . . . . . . . . . . . . . . . . . . .
9Headlight high beam indicator light 36
. . . . . . . . . . . .
10Anti-lock brake system warning light 58
. . . . . . . . . . .
11Open door warning light 59
. . . . . . . . . . . . . . . . . . . . . . .
12Tachometer 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13Headlight indicator light 33
. . . . . . . . . . . . . . . . . . . . . . .
14Cruise control indicator light 394
. . . . . . . . . . . . . . . .
15Engine oil replacement reminder light 62
. . . . . . . . . .
16Slip indicator light 406, 408, 411, 413
. . . . . . . . . . . . .
17Low engine oil pressure warning light 61
. . . . . . . . . .
18Discharge warning light 60
. . . . . . . . . . . . . . . . . . . . . . . Page
19Engine coolant temperature gauge
49
. . . . . . . . . . . . .
20Malfunction indicator lamp 57
. . . . . . . . . . . . . . . . . . . .
21Vehicle stability control system off
indicator light 408 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22Roll sensing of curtain shield airbags off
indicator light 183 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23Kinetic dynamic suspension system
warning light 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24Center differential lock indicator light 386
. . . . . . . .
25Vehicle stability control system and active
traction control system warning light 60 . . . . . . . . . . .
26Downhill assist control system
indicator light 410 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27Rear height control indicator lights 403
. . . . . . . . . . .
28Security indicator light 14, 29
. . . . . . . . . . . . . . . . . . . .
29SRS warning light 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30Trip meter reset knob 52
. . . . . . . . . . . . . . . . . . . . . . . . .
31Odometer and trip meter 52
. . . . . . . . . . . . . . . . . . . . . .
32Low fuel level warning light 62
. . . . . . . . . . . . . . . . . . . .
33Low tire pressure warning light 62
. . . . . . . . . . . . . . . .
34Fuel gauge 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xvi
Page
1Automatic transmission second start indicator light 386 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Unengaged Parkº warning light 59
. . . . . . . . . . . . . . .
3Automatic transmission fluid temperature
warning light 59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Low washer fluid warning light 63
. . . . . . . . . . . . . . . . .
5Automatic transmission indicator lights 378 . . . . . .
6Driver's seat belt reminder light 55
. . . . . . . . . . . . . . . .
7Turn signal indicator light 36
. . . . . . . . . . . . . . . . . . . . .
8Brake system warning light 54
. . . . . . . . . . . . . . . . . . . .
9Headlight high beam indicator light 36
. . . . . . . . . . . .
10Anti-lock brake system warning light 58
. . . . . . . . . . .
11Open door warning light 59
. . . . . . . . . . . . . . . . . . . . . . .
12Tachometer 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13Tail light indicator light 33
. . . . . . . . . . . . . . . . . . . . . . . .
14Cruise control indicator light 394
. . . . . . . . . . . . . . . .
15Slip indicator light 406, 408, 411, 413
. . . . . . . . . . . . .
16Low engine oil pressure warning light 61
. . . . . . . . . .
17Discharge warning light 60
. . . . . . . . . . . . . . . . . . . . . . .
18Engine coolant temperature gauge 49
. . . . . . . . . . . . . Page
19Malfunction indicator lamp
57
. . . . . . . . . . . . . . . . . . . .
20Vehicle stability control system off
indicator light 408 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21Roll sensing of curtain shield airbags off
indicator light 183 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22Kinetic dynamic suspension system
warning light 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23Center differential lock indicator light 386
. . . . . . . .
24Vehicle stability control system and active
traction control system warning light 60 . . . . . . . . . . .
25Downhill assist control system
indicator light 410 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26Rear height control indicator lights 403
. . . . . . . . . . .
27Security indicator light 14, 29
. . . . . . . . . . . . . . . . . . . .
28SRS warning light 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29Trip meter reset knob 52
. . . . . . . . . . . . . . . . . . . . . . . . .
30Odometer and trip meter 52
. . . . . . . . . . . . . . . . . . . . . .
31Low fuel level warning light 62
. . . . . . . . . . . . . . . . . . . .
32Low tire pressure warning light 62
. . . . . . . . . . . . . . . .
33Fuel gauge 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

KEYS AND DOORS
104. Start the engine within 60 seconds after the security
indicator light goes out. You cannot start the engine if 60
seconds
have passed after the security indicator went off. You
need to remove the key plate from the ignition switch and try
it again from the step 2.
NOTICE

Do not let the key case become bent as the key plate may fall out or become bent also.

The flat key is designed for emergency use only.

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference,
and (2) this device must accept any interference
received, including interference that may cause
undesired operation.
FCC ID: MOZRI-20BTY
MADE IN JAPAN
KEYS AND DOORS
14
ENGINE IMMOBILIZER SYSTEM
The engine immobilizer system is a theft prevention
system. When you insert the key in the ignition switch, the
transponder chip in the key's head transmits an electronic
code to the vehicle. The engine will start only when the
electronic code in the chip corresponds to the registered
ID code for the vehicle.
The system is automatically set when the key is removed from
the ignition switch. At this time, the security indicator light
flashes. When you insert the key in the ignition switch, the
security indicator light goes out and the system is canceled
automatically, which enables the engine to start.
The transponder chip of the flat key is in its key case. You can
cancel the engine immobilizer system using the flat key. (For
details, see Flat keyº on page 9.)For your Lexus dealer to make you a new key with built-in
transponder chip, your dealer will need your key number and
master key. However, there is a limit to the number of
additional keys your Lexus dealer can make for you.
If you make your own duplicate key, you will not be able to
cancel the system or start the engine.
For vehicles sold in U.S.A.

KEYS AND DOORS
17
Locking/Unlocking the doors
When you push the LOCKº button on the key briefly, all
the side doors and back door can be locked from outside
the vehicle.
At this time, you can hear one beep* and the turn signal lights
flash.** However, when you push the LOCKº button with any
door not closed securely, the buzzer sounds for 10 seconds.***
To stop the buzzer, close all the side doors and back door
securely or push the UNLOCKº button. If the key is in the
ignition switch, locking cannot be done.
Make sure all the doors are locked when you leave the vehicle.
Push the LOCKº button once again. If they were already
locked, the turn signal lights will flash.
NOTE:
* The beep volume can be changed. ** The turn signal lights can be set not to flash. *** The buzzer can be set not to sound if a door is not closedsecurely.
Ask your Lexus dealer for details.
When you push the UNLOCKº button, the driver's door
is unlocked. Pushing that button once again within 3
seconds from the first push, all other side doors and back
door are also unlocked.*
NOTE: * The 2-step unlocking function can be changed. Ask your Lexus dealer for details.
At this time, you can hear two beeps* and the turn signal lights
flash twice.** Together with the activation of unlocking, the
personal lights and center interior light come on for 15 seconds
if the personal light switch and center interior light switch is in
the DOORº position and the running board lights come on for
15 seconds.*** However, this function does not work when the
ignition key is in the ONº position. For further information, see
Illuminated entry systemº on page 80.
You have 30 seconds to open a door after using the wireless
remote unlock feature.**** If a door is not opened by then, all
the doors will be automatically locked again.
Even if the LOCKº or UNLOCKº button is kept pressed in, the
locking or unlocking operation is not repeated. Release the
button and then push again.
NOTE: * The beep volume can be changed. ** The turn signal lights can be set not to flash. *** The personal lights, center interior light and runningboard lights can be set not to come on or the duration oflighting can be changed. **** The time before automatic re-locking can be changed.
Ask your Lexus dealer for details.

KEYS AND DOORS
22
NOTICE

Make sure the positive side and negative side of thebattery are faced correctly.

Do not replace the battery with wet hands. Water may
cause unexpected rust.

Do not touch or move any components inside the transmitter, or it may interfere with proper operation.

Be careful not to bend the electrode when insertingthe battery and that dust or oils do not adhere to theinside the module.

Take care not to lose the screws and O-ring.
5. Install the lid with the 2 screws.
NOTICE
Take care not to damage or bend the O-ring wheninstalling.
6. Install the module into the key frame and secure the cover
with the screw.
7. When pushing any switch on the wireless key, make sure
the indicator light comes on.SIDE DOORS
Locking with key

KEYS AND DOORS
29

Security indicator light
Setting the system
1. Turn the ignition key to the LOCKº position and
remove it.
The engine immobilizer system causes the indicator light to
flash.
2. Close and lock all the doors and hood using an ignition
key or wireless remote control.
If you lock them with wireless remote control, the turn signals
flash once.
The flashing indicator light will remain on when all the doors
and hood are closed and locked.
3. After 30 seconds, the indicator starts flashing and the
system is set.
Cancelling the system
When you unlock any door using an ignition key or
wireless remote control, the system is cancelled.
If you unlock any door with wireless remote control, the turn
signals flash twice.
Activating the system
The alarm sounds for 60 seconds if any of the following are
operated:
 Unlocking any door without using an ignition key or wireless
remote control.
 Opening the hood and any doors forcibly.
 Reconnecting the battery.
If the battery becomes discharged due to the vehicle being
unused for a long time, etc., when the battery is recharged or
replaced, the system will give the alarm. If this happens,
immediately unlock any of the doors with the key or the
wireless remote control, and the alarm will stop.
If any door is unlocked and the ignition key is not in the ignition
switch during the alarm sounding, its door is automatically
locked.
To stop the alarm: Use either of the following methods.
 Unlock the door using an ignition key or wireless remote
control.
 Turn the ignition switch on.

Finish
GAUGES, METERS AND SERVICE REMINDER INDICATORS
57
(e) Malfunction Indicator Lamp
This lamp comes on when the ignition key is turned to the
ONº position and goes off after the engine starts. This
means that the warning light system is operating properly.
If the lamp remains on, or the lamp comes on while driving,
first check the followings.
 Empty fuel tank
If the fuel tank is empty, refuel immediately.
 Loose fuel tank cap
If the fuel tank cap is loose, securely tighten it.
These cases are temporary malfunctions. The malfunction
indicator lamp will go off after taking several driving trips.
If the lamp does not go off even after several trips, contact your
Lexus dealer as soon as possible.
If the fuel tank is not empty or the fuel tank cap is not
loose...
 There is a problem somewhere in the engine, emission
control system, electronic throttle control system, automatic
transmission electrical system or warning light system itself.
Contact your Lexus dealer as soon as possible to service the
vehicle.
If engine speed does not increase when the accelerator pedal
is depressed, there may be a problem somewhere in the
electronic throttle control system. At this time, vibration may occur. However, if you depress the
accelerator pedal more firmly and slowly, you can drive your
vehicle at low speeds. Have your vehicle checked by your
Lexus dealer as soon as possible.
Even if the abnormality of the electronic throttle control system
is corrected during low speed driving, the system may not be
recovered until the engine is stopped and the ignition key is
turned to ACCº or LOCKº position.
CAUTION
Be especially careful to prevent erroneous pedal
operation.
Emissions inspection and maintenance (I/M) programs
Your vehicle may not pass a state emission inspection if the
malfunction indicator lamp remains on. Contact your Lexus
dealer to check your vehicle's emission control system and
OBD (On-Board Diagnostics) system before taking your
vehicle for the inspection.
For details, see Emissions inspection and maintenance (I/M)
programsº on page 451.

Finish
INTERIOR EQUIPMENT
88
GARAGE DOOR OPENER
The garage door opener (Universal
Transceiver) is manufactured under license from
HomeLink
 and can be programmed to operate garage
doors, gates, entry doors, door locks, home lighting
systems, and security systems, etc.
(a) Programming the HomeLink
1Indicator light2Buttons
The HomeLink in your vehicle has 3 buttons and you can
store one program for each button.
To ensure correct programming into the HomeLink
, install a
new battery in the hand-held transmitter prior to programming. The battery side of the hand-held transmitter must be pointed
away from the HomeLink
 during the programming process.
For Canadian users, follow the procedure in Programming an
entrance gate/Programming all devices in the Canadian
marketº.
1. Decide which of 3 HomeLink
 buttons you want to program.
2. Place your hand-held garage transmitter 25 to 75 mm (1 to
3 in.) away from the surface of the HomeLink
.
Keep the indicator light on the HomeLink
 in view while
programming.
3. Simultaneously press and hold the hand-held garage
transmitter button along with the selected HomeLink
 button.
4. When the indicator light on the HomeLink
 changes from a
slow to a rapid flash after 20 seconds, you can release both
buttons.
5. Test the operation of the HomeLink
 by pressing the newly
programmed button. If programming a garage door opener,
check to see if the garage door opens and closes.
If the garage door does not operate, identify if your garage
transmitter is of the Rolling Codeº type. Press and hold the
programmed HomeLink
 button. The garage door has the
rolling code feature if the indicator light (on the HomeLink)
flashes rapidly and then remains lit after 2 seconds. If your
garage transmitter is the Rolling Codeº type, proceed to the
heading Programming a rolling code systemº.
6. Repeat steps 2 through 5 for each remaining HomeLink

button to program another device.