ECU Lexus GX470 2003 Basic Functions / LEXUS 2003 GX470 OWNER'S MANUAL (OM60979U)

For detailed information, refer to the description given in each section\
.
PICTORIAL INDEX
xPage
1Automatic transmission second start
indicator light 309
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Unengaged “Park” warning light 49
. . . . . . . . . . . . . . .
3Automatic transmission fluid temperature
warning light 49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Low washer fluid warning light 51
. . . . . . . . . . . . . . . . .
5Automatic transmission indicator lights 303 . . . . . .
6Driver’s seat belt reminder light 45
. . . . . . . . . . . . . . . .
7Turn signal indicator light 25
. . . . . . . . . . . . . . . . . . . . .
8Brake system warning light 44
. . . . . . . . . . . . . . . . . . . .
9Headlight high beam indicator light 25
. . . . . . . . . . . .
10“ABS” warning light 48
. . . . . . . . . . . . . . . . . . . . . . . . . .
11Open door warning light 49
. . . . . . . . . . . . . . . . . . . . . . .
12Tachometer 42
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13Headlight indicator light 24
. . . . . . . . . . . . . . . . . . . . . . .
14Cruise control indicator light 312
. . . . . . . . . . . . . . . .
15Engine oil replacement reminder light 51
. . . . . . . . . .
16Engine coolant temperature gauge 41
. . . . . . . . . . . . . Page
17Discharge warning light
50
. . . . . . . . . . . . . . . . . . . . . . .
18Low engine oil pressure warning light 50
. . . . . . . . . .
19Malfunction indicator lamp 47
. . . . . . . . . . . . . . . . . . . .
20Slip indicator light 322, 324, 327, 329
. . . . . . . . . . . . .
21Vehicle skid control system off
indicator light 324 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22Center differential lock indicator light 309
. . . . . . . .
23“VSC TRAC” warning light 50
. . . . . . . . . . . . . . . . . . . . .
24Downhill assist control system
indicator light 326 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25Rear height control indicator lights 319
. . . . . . . . . . .
26Security indicator light 12, 175
. . . . . . . . . . . . . . . . . . .
27SRS warning light 46
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28Trip meter reset knob 42
. . . . . . . . . . . . . . . . . . . . . . . . .
29Odometer and trip meter 42
. . . . . . . . . . . . . . . . . . . . . .
30Low fuel level warning light 51
. . . . . . . . . . . . . . . . . . . .
31Fuel gauge 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

KEYS AND DOORS
9
Flat key
As a transponder chip is built in its key case, you can start
the engine with this key.
The flat key works in every lock.
A transponder chip for the engine immobiliser system has been
placed in the key case of the flat key. This chip is required for
the system to function correctly, so be careful not to lose this
key. If you make your own duplicate key, you will not be able
to cancel the system or start the engine.
Insert your key plate in its key case as shown. We recommend
that you always carry this with you for emergency use. Do not
leave it in your vehicle.
Starting the engine using a flat key
1. Remove the key plate from the key case.
2. Insert the key plate into the ignition switch. The indicator
light keeps flashing.
3. Bring the key case closer to the ignition switch within 10
seconds as indicated by the arrow head. The indicator light
goes out. This means the engine immobiliser system is
automatically canceled. (For details, see “Engine immobiliser
system” on page 12.) You can put the key case away then. You
cannot cancel the engine immobiliser system if 10 seconds
have past after you inserted the key plate. You need to remove
the key plate from the ignition switch and try it again from the
step 2.
4. 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.

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 re-
ceived, including interference that may cause unde-
sired operation.
FCC ID: MOZRI20BTYMADE IN JAPAN
KEYS AND DOORS
12
ENGINE IMMOBILISER SYSTEM
The engine immobiliser 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 immobiliser system using the flat key. (For
details, see “Flat key” 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.
CAUTION
Changes or modifications not expressly approved by
the party responsible for compliance could void the
user’s authority to operate the equipment.

KEYS AND DOORS
14The wireless remote control key is an electronic
component. Observe the following instructions in order
not to cause damage to the key.

Do not leave the wireless remote control key on places
where the temperature becomes high such as on the
dashboard.
 Do not disassemble it.
 Avoid knocking it hard against other objects or dropping it.
 Avoid putting it in water.
Locking/Unlocking the doors
When you push the “LOCK” 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 “LOCK” 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 “UNLOCK” 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 “LOCK” 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 closed
securely. Ask your Lexus dealer for details. When you push the “UNLOCK” 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 2step 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 “DOOR” position and the running board lights come on for
15 seconds.*** However , this function does not work when the
ignition key is in the “ON” position. For further information, see
“Illuminated entry system” on page 65.
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 “LOCK” or “UNLOCK” 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 running
board lights can be set not to come on or the duration of
lighting can be changed.
****The time before automatic relocking can be changed.
Ask your Lexus dealer for details.

KEYS AND DOORS
18
NOTICE
Make sure the positive side and negative side of the
battery should be faced correctly.
 Do not replace the battery with wet hands. Water may
cause unexpected rust.
 Do not touch or move any components in the
transmitter, or it may interfere with proper operation.
 Be careful not to bend the electrode of the battery
insertion and that dust or oils do not adhere to the
inside of the module.
 Take care not to lose the screws and Oring.
5. Install the lid with the 2 screws.
NOTICE
Take care not to damage or bend the Oring when
installing.
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
 1 Lock2 Unlock
Turn the key towards the front of the vehicle to lock and
towards the back to unlock.
All the side doors and back door lock and unlock
simultaneously with the driver’s door. In the driver’s door lock,
turning the key once will unlock the driver’s door and twice in
succession will unlock all the side doors and back door
simultaneously.*
NOTE:
*The 2step unlocking function can be changed.
Ask your Lexus dealer for details.

Finish
GAUGES, METERS AND SERVICE REMINDER INDICATORS
47
(e) Malfunction Indicator Lamp
This lamp comes on when the ignition key is turned to the
“ON” 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 will not go off even after the 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 the engine speed does not increase with the accelerator
pedal depressed down, there may be a problem somewhere
in your 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 “ACC” or “LOCK” 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)
programs” on page 401.

Finish
INTERIOR EQUIPMENT
71
GARAGE DOOR OPENER
The garage door opener (HomeLink
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
 1 Indicator light 2 Buttons
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.
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 Code” 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 Code” type, proceed to the
heading “Programming a rolling code system”.
6. Repeat steps 2 through 5 for each remaining HomeLink

button to program another device.

Finish
INTERIOR EQUIPMENT
72
Programming a rolling code system
If your device is “Rolling Code” equipped, it is necessary
to follow steps 1 through 4 under the heading
“Programming the HomeLink
” before proceeding with
the steps listed below.
1. Locate the “training” button on the ceiling mounted garage
door opener motor. The exact location and color of the button
may vary by brand of garage door opener. Refer to the owner’s
guide supplied by the garage door opener manufacturer for the
location of this “training” button.
2. Press the “training” button on the ceiling mounted garage
door opener motor.
Following this step, you have 30 seconds in which to initiate
step 3 below.
3. Press and release the vehicle’s programmed HomeLink

button twice. The garage door may open. If the door does
open, the programming process is complete. If the door does
not open, press and release the button a third time. This third
press and release will complete the programming process by
opening the garage door.
The ceiling mounted garage door opener motor should now
recognize the HomeLink
 unit and be able to activate the
garage door up/down.
4. Repeat steps 1 through 3 for each remaining HomeLink

button to program another rolling code system.
Programming other devices
To program other devices such as home security systems,
home door locks or lighting, contact your authorized Lexus
dealer for assistance.
Reprogramming a button
Individual HomeLink buttons cannot be erased, however, to
reprogram a single button, follow the procedure “Programming
the HomeLink
”.
(b) Operating the HomeLink
To operate the HomeLink, press the appropriate HomeLink
button to activate the programmed device. The HomeLink
indicator light should come on. The HomeLink continues to
send the signal for up to 20 seconds as long as the button is
pressed.

Finish
This device complies with FCC Rules part 15.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference,
and (2) this device must accept any interference that
may be received, including interference that may
cause undesired operation. WARNING: This trans-
mitter has been tested and complies with FCC
and DOC/MDC rules. Changes or modifications
not expressly approved by the party responsible
for compliance could void the user’s authority to
operate the device.
FCC ID: CB2070NHL3
CANADA: 279 103 1936A
INTERIOR EQUIPMENT
73
(c) Erasing the entire HomeLink memory (all
three programs)
To erase all previously programmed codes at one time, press
and hold down the 2 outside buttons for 20 seconds until the
indicator light flashes.
If you sell your vehicle, be sure to erase the programs stored
in the HomeLink
 memory.
CAUTION
 When programming the HomeLink Universal
Transceiver, you may be operating a garage door or
other device. Make sure people and objects are out
of the way of the garage door or other device to
prevent potential harm or damage.
 Do not use this HomeLink
 Universal Transceiver
with any garage door opener that lacks the safety
stop and reverse feature as required by federal safety
standards. (This includes any garage door opener
model manufactured before April 1, 1982.) A garage
door opener which cannot detect an object (signaling
the door to stop and reverse), does not meet current
federal safety standards. Using a garage door opener
without these features increases risk of serious
injury or death.
CUP HOLDERS
Front
 In front of the rear console box
To use the cup holder, push the cup holder lid.
The cup holder is designed for holding cups or drink −cans
securely.
The cup holder can be adjusted to the size of the cups by
changing the separator position or moving the separator arms.
You can use it as an accessory box by removing the separator
inside.

Finish
INTERIOR EQUIPMENT
74
 In the rear console box
To use the cup holder, open the rear console box and pull
down the cup holder.
The cup holder is designed for holding cups or drink −cans
securely.
CAUTION
 Do not place anything else other than cups or
drinkcans in the cup holder, as such items may be
thrown about in the compartment and possibly injure
people in the vehicle during sudden braking or in an
accident.
 To reduce the chance of injury in case of an accident
or sudden stop while driving, keep the cup holder
closed when not in use.
Rear
 Second seat armrest
To use the cup holder, pull down the second seat armrest
and push the cup holder portion of the armrest.
The cup holder is designed for holding cups or drink −cans
securely.