ECU Lexus IS300 2003 Basic Functions / LEXUS 2003 IS300 OWNER'S MANUAL (OM53439U)

8.
For detailed information, refer to the description given in each section\
.
PICTORIAL INDEX
viii
Page
1Tachometer43
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Headlight high beam indicator light 30
. . . . . . . . . . .
3Low engine oil level warning light 49
. . . . . . . . . . . . .
4Vehicle skid control system warning light 51 . . . . . .
5Turn signal indicator lights 30
. . . . . . . . . . . . . . . . . . .
6Cruise control indicator light 241
. . . . . . . . . . . . . . . .
7Momentary fuel consumption meter 42. . . . . . . . . . .
8Voltmeter42
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9Automatic headlight leveling system warning
light 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . .
10Engine coolant temperature gauge 41
. . . . . . . . . . . .
11Anti±lock brake system warning light 50
. . . . . . . . . .
12Malfunction indicator lamp 49
. . . . . . . . . . . . . . . . . . .
13Fuel gauge 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14Low fuel level warning light 51
. . . . . . . . . . . . . . . . . . .
15Odometer and trip meter 44
. . . . . . . . . . . . . . . . . . . . .
16Power mode indicator light 232
. . . . . . . . . . . . . . . . . . Page
17Snow mode indicator light
232
. . . . . . . . . . . . . . . . . . .
18ODO/TRIP knob 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19Automatic transmission indicator lights 230 . . . . . .
20M mode indicator 233
. . . . . . . . . . . . . . . . . . . . . . . . . . .
21Gear position indicator for manual control 233 . . . .
22Discharge warning light 48
. . . . . . . . . . . . . . . . . . . . . .
23Rear light failure warning light 51
. . . . . . . . . . . . . . . .
24Security indicator light 176. . . . . . . . . . . . . . . . . . . . . .
25Traction control system
off indicator/warning light 51 . . . . . . . . . . . . . . . . . . . .
26Low engine oil pressure warning light 48
. . . . . . . . .
27Slip indicator light 244
. . . . . . . . . . . . . . . . . . . . . . . . . .
28Brake system warning light 46
. . . . . . . . . . . . . . . . . . .
29SRS warning light 47
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
30Open door warning light 50
. . . . . . . . . . . . . . . . . . . . . .
31Driver's seat belt reminder light 47
. . . . . . . . . . . . . . .
2003 IS300 from Aug. '02 Prod. (OM53439U)

10.
For detailed information, refer to the description given in each section\
.
PICTORIAL INDEX
x
Page
1Tachometer43
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Headlight high beam indicator light 30
. . . . . . . . . . .
3Low engine oil level warning light 49
. . . . . . . . . . . . .
4Vehicle skid control system warning light 51 . . . . . .
5Turn signal indicator lights 30
. . . . . . . . . . . . . . . . . . .
6Cruise control indicator light 241
. . . . . . . . . . . . . . . .
7Momentary fuel consumption meter 42. . . . . . . . . . .
8Voltmeter42
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9Automatic headlight leveling system warning
light 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . .
10Engine coolant temperature gauge 41
. . . . . . . . . . . .
11Anti±lock brake system warning light 50
. . . . . . . . . .
12Malfunction indicator lamp 49
. . . . . . . . . . . . . . . . . . .
13Fuel gauge 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14Low fuel level warning light 51
. . . . . . . . . . . . . . . . . . .
15Odometer and trip meter 44
. . . . . . . . . . . . . . . . . . . . .
16Power mode indicator light 232
. . . . . . . . . . . . . . . . . . Page
17Snow mode indicator light
232
. . . . . . . . . . . . . . . . . . .
18ODO/TRIP knob 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19Automatic transmission indicator lights 230 . . . . . .
20M mode indicator 233
. . . . . . . . . . . . . . . . . . . . . . . . . . .
21Gear position indicator for manual control 233 . . . .
22Discharge warning light 48
. . . . . . . . . . . . . . . . . . . . . .
23Rear light failure warning light 51
. . . . . . . . . . . . . . . .
24Security indicator light 176. . . . . . . . . . . . . . . . . . . . . .
25Traction control system
off indicator/warning light 51 . . . . . . . . . . . . . . . . . . . .
26Low engine oil pressure warning light 48
. . . . . . . . .
27Slip indicator light 244
. . . . . . . . . . . . . . . . . . . . . . . . . .
28Brake system warning light 46
. . . . . . . . . . . . . . . . . . .
29SRS warning light 47
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
30Open door warning light 50
. . . . . . . . . . . . . . . . . . . . . .
31Driver's seat belt reminder light 47
. . . . . . . . . . . . . . .
2003 IS300 from Aug. '02 Prod. (OM53439U)

KEYS AND DOORS
9
Flat key
SV11020
Since 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 engine immobiliser system has been
placed in the key case of the flat key. This chip is needed to
enable 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
SV11011
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 cancelled. (For details, see ºEngine immobiliser
systemºon 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 20 seconds after the security
indicator light goes out. You cannot start the engine if 20
seconds have past 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.
2003 IS300 from Aug. '02 Prod. (OM53439U)

KEYS AND DOORS
12
ENGINE IMMOBILISER SYSTEM
SV11007
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.
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 or the flat key. However, there is a limit to the
number of additional keys your Lexus dealer can make for you. 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 ºFlat keyº on page 9.)
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.
FCC ID: MOZ RI±4ATY
MADE IN JAPAN
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.
CAUTION
Changes or modifications not expressly approved by
the party responsible for compliance could void the
user's authority to operate the equipment.
2003 IS300 from Aug. '02 Prod. (OM53439U)

KEYS AND DOORS
15
Locking/Unlocking the doors
When you push the ºLOCKº button on the key briefly, all
the doors will be locked from outside the vehicle.
At this time, one beep sounds* and the emergency flashers
flash once.** However, when you push the ºLOCKº button with
any door not closed securely, the buzzer sounds for 10
seconds.*** To stop the buzzer, close all the doors securely or
push the ºUNLOCKº 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 ºLOCKº button once again. If they were already
locked, one beep sounds and the emergency flashers will
flash.
NOTE: *The beep sound can be set not to sound. **The emergency flasher can be set not to flash. ***The buzzercan be set not to sound if a door is not closed securely. Askyour Lexus dealer for details.
NOTICE
Sedan only: Do not push the ºLOCKº button any longerthan 2 to 3 seconds. Pushing the button longeractivates an alarm. For details, see page 16.
When you push the ºUNLOCKº button, the driver's door
is unlocked. Pushing that button once again within 3
seconds from the first push, all other doors are also
unlocked.*
NOTE: *The 2±step unlocking function can be changed.Ask your Lexus dealer for details.
At this time, two beeps sound* and the emergency flashers
flash twice.** Together with the activation of unlocking, the
interior light comes on for 15 seconds if the interior light switch
is in ºDOORº position.*** However, this function does not
work when the ignition key is in the ºONº position. For further
information, see ºInterior lightsº on page 57.
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 ºLOCKº or ºUNLOCKº switch is kept pressed in, the
locking or unlocking operation is not repeated. Release the
button and then push again.
NOTE: *The beep sound can be set not to sound. **The emergency flashers can be set not to flash. ***The interiorlight can be set not to come on or the duration of lighting can
be changed. ****The time before automatic re±locking can be changed. Ask your Lexus dealer for details.
2003 IS300 from Aug. '02 Prod. (OM53439U)

KEYS AND DOORS
19
11L029±1
2. Remove the module from the key frame.
11L030±1
3. Remove the 2 screws to take out the lid of the module.
4. Take out the discharged battery and put a new battery with
the positive side up.
NOTICE
Make sure the positive side and negative side of thebattery should be faced correctly.
Do not replace the battery with wet hands. Water may
cause unexpected rust.
Do not touch or move any components inside of the transmitter, or it may interfere with proper operation.
Be careful not to bend the electrode of the batteryinsertion and that dust or oils do not adhere to theinside of 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.
2003 IS300 from Aug. '02 Prod. (OM53439U)

KEYS AND DOORS
23
To open the back door from the outside, open it during
pressing the back door opener.
If the back door will not open even pressing the back door
opener, press it again.
When
opening the back door, make sure that the back door will
not come down by itself.
The back door can be opened when the vehicle is stopped.
The back door can be locked or unlocked in the following ways.
 Operate the power door lock switch. (See ºDoorsº on page
20.)
 Operate the wireless remote control. (See ºWireless
remote controlº on page 13.)
 Locking (or unlocking) the driver's door will lock (or unlock)
all the other doors simultaneously. In the driver's door lock,
turning the key once will unlock the driver's door and twice
in succession will unlock all doors simultaneously.
If the battery terminal is disconnected and reconnected, the
back door will be automatically locked. Be careful not to lock
your keys in the vehicle.
See ºLuggage stowage precautionsº on page 80 for
precautions in loading luggage.
SV11023
When closing the back door, use the inside handle for
easier reach to the back door.
To close the back door, lower it and press down on it. After
closing the back door, try pulling it up to make sure it is securely
closed.
When closing the back door, make sure it is securely closed.
See ºLuggage stowage precautionsº on page 80 for
precautions in loading luggage.
2003 IS300 from Aug. '02 Prod. (OM53439U)

GAUGES, METERS AND SERVICE REMINDER INDICATORS
49
(g) Low Engine Oil Level Warning Light
This light warns that the engine oil level is too low. Add oil as
soon as possible. (For instructions, see ºChecking the engine
oil levelº on page 315.)
While driving on steep inclines or rough roads which causes
the vehicle to substantially sway or on curves, this light may
come on due to the movement of engine oil in the engine.
In normal conditions, due to engine oil consumption, this light
may come on earlier than the specified service interval of the
scheduled maintenance. This is because the engine oil is
consumed to the low level within the scheduled maintenance
interval and does not indicate a problem. (For detailed
information, see ºFacts about engine oil consumptionº on page
313.)
NOTICE
Continued engine operation with low engine oil will damage the engine.
(h) Malfunction Indicator Lamp
This lamp comes on when the ignition key is turned to the
ºONº 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 this lamp comes on and the engine speed does not increase
with the accelerator pedal depressed down to about the middle
position, there may be a problem somewhere in your electronic
throttle control system.
At this time, if you depress the accelerator pedal more firmly
and slowly, you can drive your vehicle at low speeds. Have
your Lexus 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 ºACCº or ºLOCKº position.
2003 IS300 from Aug. '02 Prod. (OM53439U)

INTERIOR EQUIPMENT
63
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
SV14007

1Buttons 2Indicator light
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 ºProgramming 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 ºRolling 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 ºRolling Codeº type, proceed to the
heading ºProgramming a rolling code systemº.
6. Repeat steps 2 through 5 for each remaining HomeLink

button to program another device.
2003 IS300 from Aug. '02 Prod. (OM53439U)

INTERIOR EQUIPMENT
64
Programming a rolling code system
If your device is ºªRolling Codeº equipped, it is necessary
to follow steps 1 through 4 under the heading
ºProgramming the HomeLink
º before proceeding with
the steps listed below.
1. Locate the ºtrainingº 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 ºtrainingº button.
2. Press the ºtrainingº 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 in 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 an entrance gate /
Programming all devices in the Canadian
market
1. Decide which of the 3 HomeLink buttons you want to
program.
2. Place your hand± held gate/device 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. Press and hold the selected HomeLink
 button.
4. Continuously press and release (cycle) the hand± held
gate/device transmitter button every two seconds until step 5
is complete.
5. When the indicator light on the HomeLink
 changes from
a slow to a rapid flash after 20 seconds, you can release both
buttons.
6. Test the operation of the HomeLink
 by pressing the newly
programmed button. Check to see if the gate/device operates
correctly.
7. Repeat steps 1 through 6 for each remaining HomeLink

button to program another device.
Programming other devices
To program other devices such as home security systems,
home door locks or lighting, contact your authorized Lexus
dealer for assistance.
2003 IS300 from Aug. '02 Prod. (OM53439U)