2004 Lexus GX470 ECU

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
serious 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 as needed 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 401 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Unengaged Parkº warning light 68
. . . . . . . . . . . . . . .
3Automatic transmission fluid temperature
warning light 69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Low washer fluid warning light 73
. . . . . . . . . . . . . . . . .
5Automatic transmission indicator lights 393 . . . . . .
6Driver's seat belt reminder light 65
. . . . . . . . . . . . . . . .
7Turn signal indicator light 36
. . . . . . . . . . . . . . . . . . . . .
8Brake system warning light 64
. . . . . . . . . . . . . . . . . . . .
9Headlight high beam indicator light 36
. . . . . . . . . . . .
10Anti-lock brake system warning light 67
. . . . . . . . . . .
11Open door warning light 68
. . . . . . . . . . . . . . . . . . . . . . .
12Tachometer 60
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13Headlight indicator light 33
. . . . . . . . . . . . . . . . . . . . . . .
14Cruise control indicator light 409
. . . . . . . . . . . . . . . .
15Engine oil replacement reminder light 72
. . . . . . . . . .
16Slip indicator light 421, 423, 426, 428
. . . . . . . . . . . . .
17Low engine oil pressure warning light 71
. . . . . . . . . .
18Discharge warning light 70
. . . . . . . . . . . . . . . . . . . . . . . Page
19Engine coolant temperature gauge
58
. . . . . . . . . . . . .
20Malfunction indicator lamp 66
. . . . . . . . . . . . . . . . . . . .
21Vehicle stability control system off
indicator light 423 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22Roll sensing of curtain shield airbags off
indicator light 193 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23Kinetic dynamic suspension system
warning light 70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24Center differential lock indicator light 401
. . . . . . . .
25Vehicle stability control system and active
traction control system warning light 70 . . . . . . . . . . .
26Downhill assist control system
indicator light 425 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27Rear height control indicator lights 418
. . . . . . . . . . .
28Security indicator light 14, 29
. . . . . . . . . . . . . . . . . . . .
29SRS warning light 66
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30Trip meter reset knob 61
. . . . . . . . . . . . . . . . . . . . . . . . .
31Odometer and trip meter 61
. . . . . . . . . . . . . . . . . . . . . .
32Low fuel level warning light 72
. . . . . . . . . . . . . . . . . . . .
33Low tire pressure warning light 72
. . . . . . . . . . . . . . . .
34Fuel gauge 57
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xvi
Page
1Automatic transmission second start indicator light 401 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Unengaged Parkº warning light 68
. . . . . . . . . . . . . . .
3Automatic transmission fluid temperature
warning light 69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Low washer fluid warning light 73
. . . . . . . . . . . . . . . . .
5Automatic transmission indicator lights 393 . . . . . .
6Driver's seat belt reminder light 65
. . . . . . . . . . . . . . . .
7Turn signal indicator light 36
. . . . . . . . . . . . . . . . . . . . .
8Brake system warning light 64
. . . . . . . . . . . . . . . . . . . .
9Headlight high beam indicator light 36
. . . . . . . . . . . .
10Anti-lock brake system warning light 67
. . . . . . . . . . .
11Open door warning light 68
. . . . . . . . . . . . . . . . . . . . . . .
12Tachometer 60
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13Tail light indicator light 33
. . . . . . . . . . . . . . . . . . . . . . . .
14Cruise control indicator light 409
. . . . . . . . . . . . . . . .
15Slip indicator light 421, 423, 426, 428
. . . . . . . . . . . . .
16Low engine oil pressure warning light 71
. . . . . . . . . .
17Discharge warning light 70
. . . . . . . . . . . . . . . . . . . . . . .
18Engine coolant temperature gauge 58
. . . . . . . . . . . . . Page
19Malfunction indicator lamp
66
. . . . . . . . . . . . . . . . . . . .
20Vehicle stability control system off
indicator light 423 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21Roll sensing of curtain shield airbags off
indicator light 193 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22Kinetic dynamic suspension system
warning light 70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23Center differential lock indicator light 401
. . . . . . . .
24Vehicle stability control system and active
traction control system warning light 70 . . . . . . . . . . .
25Downhill assist control system
indicator light 425 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26Rear height control indicator lights 418
. . . . . . . . . . .
27Security indicator light 14, 29
. . . . . . . . . . . . . . . . . . . .
28SRS warning light 66
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29Trip meter reset knob 61
. . . . . . . . . . . . . . . . . . . . . . . . .
30Odometer and trip meter 61
. . . . . . . . . . . . . . . . . . . . . .
31Low fuel level warning light 72
. . . . . . . . . . . . . . . . . . . .
32Low tire pressure warning light 72
. . . . . . . . . . . . . . . .
33Fuel gauge 57
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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 90.
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.

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
THEFT DETERRENT SYSTEM
To deter theft of the vehicle, this system is designed to
sound an alarm if any of the doors or hood is forcibly
unlocked or the battery terminal is disconnected and then
reconnected while the vehicle is locked.
The alarm blows the horn intermittently and flashes the
headlights, tail lights and turn signal lights.
Further more when the center interior light switch and personal
light switch are in the DOORº position, the center interior light
and personal lights turn on.

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.