ECU Lexus GX470 2003 Basic Functions / LEXUS 2003 GX470 (OM60979U) Service Manual

COMFORT ADJUSTMENT
164
 Align both third seatbacks at the same angle
 When installing a child restraint system in the third
center position, align both seatbacks at the same
angle. Otherwise, the child restraint system cannot
be securely restrained and this may cause death or
serious injuries in a collision.
1. Sit the child on a booster seat. Run the lap and shoulder
belt through or around the booster seat and across the child
following the instructions provided by its manufacturer and
insert the tab into the buckle.
Make sure the shoulder belt is correctly across the child’s
shoulder and that the lap belt is positioned as low as possible
on child’s hips. See “Seat belts” on page 123 for details.
CAUTION
 Always make sure the shoulder belt is positioned
across the center of child’ s shoulder. The belt should
be kept away from child’s neck, but not falling off
child’s shoulder. Failure to do so could reduce the
amount of protection in an accident and cause
serious injuries in a collision.

COMFORT ADJUSTMENT
167
1. Remove the head restraint.
2. Open the cover of the anchor bracket.
3. Fix the child restraint system with the seat belt.
4. Latch the hook onto the anchor bracket and tighten the
top strap.
For instructions to install the child restraint system, see “Child
restraint system” on page 151.
CAUTION
 Make sure the top strap is securely latched, and
check that the child restraint system is securely by
pushing and pulling it in different directions.
 Follow all the installation instructions provided by its
manufacturer.

COMFORT ADJUSTMENT
170
16PY109
 Type B Type A
3. Latch the hooks of lower straps onto the anchorages
and tighten the lower straps.
Type B
3. Latch the buckles onto the anchorages.
If your child restraint system has a top strap, it should be
anchored.
(For the installation of the top strap, see “Using a top
strap” on page 166.)
For the installation details, refer to the instruction manual
equipped with each product.
CAUTION
 When using the lower anchorages for the child
restraint system, be sure that there are no irregular
objects around the anchorages or that the seat belt is
not caught.
 Push and pull the child restraint system in different
directions to be sure it is secure. Follow all the
installation instructions provided by its
manufacturer.
 Do not install a child restraint system on the second
seat if it interferes with the lock mechanism of the
front seats. This can cause death or serious injury to
the child and front passenger in case of sudden
braking or a collision.

THEFT DETERRENT
175
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 “DOOR” position, the center interior light
and personal lights turn on.
 Security indicator light
Setting the system
1. Turn the ignition key to the “LOCK” position and
remove it.
The engine immobiliser 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.

AUDIO
231
1. Pull the case out while pushing the lock release button to
the side.
2. Remove the discharged battery.
3. Put in a new battery with the positive (+) side up.Put in the case securely.
NOTICE
Make sure that the positive side of the controller
battery is facing correctly.
 Do not replace the battery with wet hands. Water may
cause rust.
 Do not touch or move any components inside of the
controller, or it may interfere with proper operation.
 Be careful not to bend the electrode of the controller
battery insertion and that dust or oil does not adhere
to the transmitter case.
 Close the battery case securely.
After replacing the battery, check that the controller operates
properly. If the controller still does not operate properly , contact
your Lexus dealer.

AUDIO
247
1. Pull the case out while pushing the lock release button to
the side.
2. Remove the discharged battery.
3. Put in a new battery with the positive (+) side up.Put it in the case securely.
NOTICE
Be sure that the positive side of the controller battery
is facing correctly.
 Do not replace the battery with wet hands. Water may
cause rust.
 Do not touch or move any components inside of the
controller, or it may interfere with proper operation.
 Be careful not to bend the electrode of the controller
battery insertion and that dust or oil does not adhere
to the transmitter case.
 Close the battery case securely.
After replacing the battery, check that the controller operates
properly. If the controller still does not operate properly , contact
your Lexus dealer.

DRIVING TIPS
342
CAUTION
Before driving off, make sure the parking brake is
fully released and that the parking brake reminder
light is off.
 Do not leave your vehicle unattended while the
engine is running.
 Do not rest your foot on the brake pedal while driving.
It can cause dangerous overheating, needless wear,
and poor fuel economy.
 To drive down a long or steep hill, reduce your speed
and downshift. Remember, if you ride the brakes
excessively, they may overheat and not work
properly. See page 306.
 Be careful when accelerating, upshifting,
downshifting or braking on a slippery surface. The
abrupt change in engine speed, such as sudden
acceleration or engine braking, could cause the
vehicle to spin or skid.
 Do not drive in excess of the speed limit. Even if the
legal speed limit permits it, do not drive over 140 km/h
(85 mph) unless your vehicle has highspeed
capability tires. Driving over 140 km/h (85 mph) may
result in tire failure, loss of control and possible
injury. Be sure to consult a tire dealer to determine
whether the tires on your vehicle are highspeed
capability tires or not before driving at such speeds.
 Do not continue normal driving when the brakes are
wet. If they are wet, your vehicle will require a longer
stopping distance, and it may pull to one side when
the brakes are applied. Also, the parking brake will
not hold the vehicle securely.
 If you drive through deep water over about 500 mm
(20 in.) in depth, put the vehicle height in the HI (High)
mode with the active height select switch and then
turn off the active height control suspension by
pushing the height control switch. Drive your vehicle
at 30 km/h (19 mph) or lower speed.

DRIVING TIPS
349
Tow hitch receiver (on some models)
The tow hitch receiver is installed under the rear bumper.
CAUTION
A tow hitch receiver is rated for weight carrying towing
only up to 2268 kg (5000 lbs.) Only use this tow hitch
receiver on your vehicle. Do not use this tow hitch
receiver on any other vehicle.
Hitches
Use only weight carrying hitch hardware designed for the
total trailer weight with the factory installed hitch.
 If you wish to install an aftermarket hitch, the hitch must be
bolted securely to the vehicle frame and installed according
to the hitch manufactures’ instructions.
 The hitch ball and king pin should have a light coat of grease.
 Lexus recommends the ball mount assembly be removed
when not towing to prevent injury and to prevent damage in
the event of a rear end collision. After removing the ball
mount assembly, install the grommet to the hitch to prevent
entry of dirt and mud.
Trailer ball
Follow these easy steps to properly determine the correct
trailer ball for your application:
1. Determine the correct trailer ball size for the trailer coupler.
Most couplers are stamped with the required trailer ball size.
The sizes you’ll most likely find stamped on the coupler are:
Trailer Class
Typical Trailer Ball Size
III 2−5/16 in.
II 2 in.
I1 −7/8 in.
2. Select the appropriate trailer ball to match or exceed the
gross trailer weight rating of the trailer. The trailer ball load
rating should be printed on the top of the ball.

DRIVING TIPS
351
Brakes and safety chains
Lexus recommends trailers with brakes that conform to
any applicable federal and state/provincial regulations.
 A safety chain must always be used between the towing
vehicle and the trailer. Leave sufficient slack in the
chain for turns. The chain should cross under the
trailer tongue to prevent the tongue from dropping to
the ground in case it becomes damaged or separated.
For correct safety chain procedures, consult your
Lexus dealer.
CAUTION
If the total trailer weight exceeds 453 kg (1000 lb.),
trailer brakes are required.
 Never tap into your vehicle’s hydraulic system as it
will lower its braking effectiveness.
 Never tow a trailer without using a safety chain
securely attached to both the trailer and the vehicle.
If damage occurs to the coupling unit or hitch ball,
there is possible danger of the trailer wandering over
into another lane.
Service connector for towing brake controller
Your vehicle is equipped with a service connector for the
towing brake controller as shown. Link the connector to the
towing brake controller via the sub wire harness stored in the
glove box. The detailed explanation of the sub wire harness
circuit is packed together with the sub wire harness. Be sure
to position the towing brake controller where it does not prevent
the driver from operating the pedal. Lexus recommends that
the sub wire harness be stored in the glove box when it is not
in use.

DRIVING TIPS
354
Pretowing safety check
Check that your vehicle remains level when a loaded or
unloaded trailer is hitched. Do not drive if the vehicle has an
abnormal nose −up or nose− down condition, and check for
improper tongue load, overload, worn suspension or other
possible causes.
 Make sure the trailer cargo is securely loaded so that it
cannot shift.
 Check that your rear view mirrors conform to any federal,
state/provincial or local regulations. If they do not, install
required rear view mirrors appropriate for towing purposes.
Trailer towing tips
When towing a trailer, your vehicle will handle differently
than when not towing. The three main causes of
vehicletrailer accidents are driver error, excessive speed
and improper trailer loading. Keep these in mind when
towing:
 Before starting out, check the operation of the lights and all
vehicle −trailer connections. After driving a short distance,
stop and recheck the lights and connections. Practice
turning, stopping and backing with a trailer in an area away
from traffic until you learn the feel. 
Backing with a trailer is difficult and requires practice. Grip
the bottom of the steering whe el and move your hand to the
left to move the trailer to the left. Move your hand to the right
to move the trailer to the right. (This procedure is generally
opposite to that when backing without a trailer.) Also, just
turn the steering wheel a little at a time, avoiding sharp or
prolonged turning. Have someone guide you when backing
to reduce the risk of an accident.
 Because stopping distance may be increased,
vehicle −to−vehicle distance should be increased when
towing a trailer. For each 16 km/h (10 mph) of speed, allow
at least one vehicle and trailer length between you and the
vehicle ahead. Avoid sudden braking as you may skid,
resulting in jackknifing and loss of control. This is especially
true on wet or slippery surfaces.
 Avoid jerky starts or sudden acceleration.
 Avoid jerky steering and sharp turns. The trailer could hit
your vehicle in a tight turn. Slow down before making a turn
to avoid the need of sudden braking.
 Remember that when making a turn, the trailer wheels will
be closer than the vehicle wheels to the inside of the turn.
Therefore, compensate for this by making a larger than
normal turning radius with your vehicle.