2004 TOYOTA SIENNA ECU

04 SIENNA_U (L/O 0408)
356
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
To install the cup holder and small tray:
Cup holder—Hook the front of the cup
holder to the console box under−tray, then
push down the back of the cup holder to
secure it.
Small tray—Hook the back of the small
tray to the console box under −tray, then
push down the front of the small tray to
secure it.
Make sure the cup holder and small tray
are locked securely.
CAUTION
Make sure the the cup holder and
small tray are securely locked by
pushing forward and rearward when
they are installed. Failure to do so
may cause an unexpected accident
or severe injury in the event of
emergency braking or a collision.
Do not place anything other than
cups or drink cans in the cup hold-
er, and do not place anything in the
console box tray, as such items
may be thrown about 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 a sudden
stop while driving, keep the cup
holder and small tray stored when
they are not in use.
Note pad holder

04 SIENNA_U (L/O 0408)
358
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
To fold down the table, pull up the lock
release lever and push against the front
passenger ’s seat side.
Make sure the table is locked securely.
CAUTION
Do not put heavy things on the
front seat side table. The table may
fall down and cause personal injury.
To reduce the chance of injury in
case of an accident or a sudden
stop, always keep the auxiliary box
closed while driving.
Do not place anything else other
than cups or drinkcans in the cup
holder, as such items may be
thrown about 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 a sudden
stop while driving, make sure the
table is folded down and locked se-
curely when it is not in use.
To use the coat hook, pull it down.
CAUTION
Vehicles with side airbags and curtain
shield airbags—Do not hook a hanger,
heavy or sharp pointed object on the
coat hook. If the curtain shield airbag
inflates, those items will be hurled
away with great force or the curtain
shield airbag may not activate cor-
rectly. When you hang clothes, hang
them on the coat hook directly.
Coat hooks

04 SIENNA_U (L/O 0408)
361
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
To secure your luggage, use the tie
down hooks as shown above.
See “—Stowage precautions” on page 389
in Section 2 for precautions when loading
luggage.
CAUTION
To avoid personal injury, keep the tie
down hooks folded when not in use.
The roof luggage carrier consists of
roof rails (1) attached to the roof and
sliding cross rails (2).
To adjust the positions of cross rails, do
this.1. Turn the knobs counterclockwise to loosen the cross rails.
2. Slide the cross rails to the desired position for loading the luggages of
various sizes.
3. After adjusting, be sure to tighten the cross rails by turning knobs clockwise.
Follow the manufacturer ’s instructions and
precautions when installing the attach-
ments or their equivalent.
CAUTION
When you load cargo on the roof lug-
gage carrier, observe the following:
Place the cargo so that its weight
is distributed evenly between the
front and rear axles.
If loading long or wide cargo, never
exceed the vehicle overall length or
width. (See “Dimensions and
weights” on page 488 in Section 8
for information on your vehicle
overall length and width.)
Before driving, make sure the cargo
is securely fastened on the roof
luggage carrier.
Loading cargo on the roof luggage
carrier will make the center of the
vehicle gravity higher. Avoid high
speeds, sudden starts, sharp turns,
sudden braking or abrupt maneu-
vers, otherwise it may result in loss
of control or vehicle rollover due to
failure to operate this vehicle cor-
rectly.
Tiedown hooks Roof luggage carrier

04 SIENNA_U (L/O 0408)
396
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
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 con-
sult 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 park-
ing brake will not hold the vehicle
securely.
If you need greater traction while driv-
ing on sand, mud or snow covered
roadways, use tire chains on the front
wheels.
Always check your brakes for effective-
ness immediately after driving across
sand, mud, or water.
If operating in adverse conditions
frequently, vehicle maintenance should
be increased. (See the separate
“Scheduled Maintenance Guide” or
“Owner ’s Manual Supplement”.)
CAUTION
Observe the following tire instruc-
tions. Otherwise, an accident may oc-
cur resulting in death or serious inju-
ries.
Keep your tire pressure at the prop-
er level. (See “Checking tire infla-
tion pressure” on page 463 in Sec-
tion 72.)
Do not use tires (including snow
tires) of different brands, sizes,
construction or tread patterns. (See
“Checking and replacing tires” on
page 466 and “Installing snow tires
and chains” on page 471 in Section
72.)
Do not use tires with different tread
wear. To equalize the tire wear, ro-
tate tires at the appropriate interval.
(See “Rotating tires” on page 468
in Section 72.)
Use the manufacturer ’s recom-
mended wheels. Do not use wheels
of different sizes and types. (See
“Replacing wheels” on page 473 in
Section 72.)
NOTICE
Do not attempt to go offroad in your
Toyota. It is not designed for offroad
use.
Allwheel driving tips
(AWD models)

04 SIENNA_U (L/O 0408)
400
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
Weight carrying hitchWithout towing package 90 kg (200 lb.)
With towing package
158 kg (350 lb.)
Weight distributing hitch With towing package
238 kg (525 lb.)
Never load the trailer with more
weight in the back than in the
front. About 60% of the trailer load
should be in the front half of the
trailer and the remaining 40% in the
rear.
HITCHES
If you wish to install a trailer hitch, you
should consult with your Toyota dealer.
Use only a hitch recommended by the
hitch manufacturer and the one which
conforms to the total trailer weight
requirement.
The hitch must be bolted securely to
the vehicle frame and installed accord-
ing to the hitch manufacturer ’s instruc-
tions.
The hitch ball and king pin should have
a light coat of grease.
Toyota recommends removing the trail-
er hitch whenever you are not towing
a trailer to reduce the possibility of
additional damage caused by the hitch
if your vehicle is struck from behind.
After removing the hitch, seal any
mounting holes in the vehicle body to
prevent entry of pollutants such as ex-
haust fumes, dirt, water, etc.
NOTICE
Do not use axlemounted hitches as
they can cause damage to the axle
housing, wheel bearings, wheels or
tires. Also, never install a hitch which
may interfere with the normal function
of an Energy Absorbing Bumper, if so
equipped.
BRAKES AND SAFETY CHAINS
Toyota recommends trailers with
brakes that conform to any applica-
ble federal and state/provincial regu-
lations.
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 dam-
aged or separated. For correct safety
chain procedures, follow the hitch or
trailer manufacturer ’s recommenda-
tions.
CAUTION
If the total trailer weight exceeds
453 kg (1000 lb.), trailer brakes are
required.
Never tap into your vehicle’s hy-
draulic system as it would 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 danger of the
trailer wandering over into another
lane.

04 SIENNA_U (L/O 0408)
401
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
TIRES
Ensure that your vehicle’s tires are
properly inflated. See page 463 in Sec-
tion 7−2 and page 491 in Section 8 for
instructions.
The trailer tires should be inflated to
the pressure recommended by the trail-
er manufacturer in respect to the total
trailer weight.
TRAILER LIGHTS
Trailer lights must comply with federal,
state/provincial and local regulations.
See your local recreational vehicle
dealer or rental agency for the correct
type of wiring and relays for your trail-
er. Check for correct operation of the
turn signals and stop lights each time
you hitch up. Direct splicing may dam-
age your vehicle’s electrical system
and cause a malfunction of your lights.
BREAKIN SCHEDULE
Toyota recommends that you do not
tow a trailer with a new vehicle or a
vehicle with any new power train com-
ponent (engine, transmission, differen-
tial, wheel bearing, etc.) for the first
800 km (500 miles) of driving. MAINTENANCE
If you tow a trailer, your vehicle will
require more frequent maintenance due
to the additional load. For this
information, please refer to the
scheduled maintenance information in
the “Scheduled Maintenance Guide” or
“Owner ’s Manual Supplement”.
Retighten all fixing bolts of the towing
ball and bracket after approximately
1000 km (600 miles) of trailer driving.
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 con-
form to any applicable federal, state/
provincial or local regulations. If not,
install the rear view mirrors required
for towing purpose. TRAILER TOWING TIPS
When towing a trailer, your vehicle will
handle differently than when not tow-
ing. The three main causes of vehicle
trailer accidents are driver error, exces-
sive speed and improper trailer loading.
Keep these in mind when towing:
Before starting out, check operation of
the lights and all vehicle
−trailer connec-
tions. After driving a short distance,
stop and recheck the lights and con-
nections. Before actually towing a trail-
er, practice turning, stopping and back-
ing 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 wheel 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 pro-
cedure 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 acci-
dent.

04 SIENNA_U (L/O 0408)
415
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
To store the jack, turn the jack joint
until the jack base fits securely with
the vehicle body.
This prevents the jack from flying for-
ward during a collision or sudden
stop.To remove the wheel nut wrench, turn
the wingnut counterclockwise.
When storing the wheel nut wrench,
turn the wingnut clockwise and make
sure the wrench is securely held.To remove the spare tire:
1. Slide the front passenger ’s seat to the front −most lock position and
the right side second seat to the
rear −most lock position so they
will not interfere with the wheel nut
wrench.
Open the right side sliding door
and you will find the flap on the
floor. Pull back the flap to find the
spare tire clamp bolt.

04 SIENNA_U (L/O 0408)
416
2004 SIENNA from Aug. ’04 Prod. (OM45422U)
2. Loosen the spare tire clamp boltby turning it counterclockwise with
the wheel nut wrench.3. After the tire is lowered completelyto the ground, remove the holding
bracket.
When storing the spare tire, put it in
place with the outer side of the wheel
facing up. Then secure the tire, taking
care that the tire goes straight up
without catching on any other part, to
prevent it from flying forward during
a collision or sudden braking.
As the tire carrier is designed for the
compact spare tire, the standard tire
cannot be stored there.
CAUTION
Do not remove the spare tire
when jacking up the vehicle. The
tire carrier and the spare tire may
interfere with the jack and cause
a serious accident.
NOTICE
 To secure spare tire clamp
bolt:
Do not use impact wrench,
but wheel nut wrench.
 After taking out or stowing
the spare tire, make sure to
secure the tire carrier by
tightening the clamp bolt to
prevent the holding bracket
from hitting the under body
of the vehicle during driving.
 Do not store the flat spare
tire with the tire carrier so it
may not be held securely.