2003 TOYOTA HIGHLANDER ECU

’03 HIGHLANDER_U (L/O 0208)
2282003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
11. Check the air pressure of the re-
placed tire.
Adjust the air pressure to the specification
designated on page 289 in Section 8. If
the pressure is lower, drive slowly to the
nearest service station and fill to the cor-
rect pressure.
Do not forget to reinstall the tire inflation
valve cap as dirt and moisture could get
into the valve core and possibly cause air
leakage. If the cap is missing, have a new
one put on as soon as possible.
12. Restow all the tools and jack secure- ly.
As soon after changing wheels as pos-
sible, tighten the wheel nuts to the torque
specified on page 289 in Section 8 with
a torque wrench. Have a technician repair
the flat tire.
CAUTION
Before driving, make sure all the
tools and jack are securely in place
in their storage location to reduce the
possibility of personal injury during a
collision or sudden braking.
If your vehicle becomes stuck in snow,
mud, sand, etc., then you may attempt
to rock the vehicle free by moving it
forward and backward.
If your vehicle is equipped with the
traction control system, turn off the
system to become unstuck. (For details,
see “Traction control system” on page
119 in Section 16.)
CAUTION
Do not attempt to rock the vehicle
free by moving it forward and back-
ward if people or objects are any-
where near the vehicle. During the
rocking operation the vehicle may
suddenly move forward or backward
as it becomes unstuck, causing injury
or damage to nearby people or ob-
jects.
NOTICE
If you rock your vehicle, observe the
following precautions to prevent dam-
age to the transmission and other
parts.
 Do not depress the accelerator ped-
al while shifting the selector lever
or before the transmission is com-
pletely shifted to forward or reverse
gear.
 Do not race the engine and avoid
spinning the wheels.
 If your vehicle remains stuck after
rocking the vehicle several times,
consider other ways such as tow-
ing.
—After changing wheels If your vehicle becomes stuck

’03 HIGHLANDER_U (L/O 0208)
2312003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
Front
Rear
If towing is necessary, we recommend
you to have it done by your Toyota
dealer or a commercial tow truck ser-
vice.
If towing service is not available in an
emergency, your vehicle may be tempo-
rarily towed by a cable or chain se-
cured to one of the emergency towing
eyelets on the front of the vehicle or
the right emergency towing eyelet un-
der the rear of the vehicle. Use extreme
caution when towing the vehicle.
To install the front towing eyelet, see
“—Installing front towing eyelet” on page
232 in this section.
NOTICE
Only use specified towing eyelet;
otherwise your vehicle may be dam-
aged.
A driver must be in the vehicle to steer
it and operate the brakes.
Towing in this manner may be done only
on hardsurfaced roads for a short dis-
tance and at low speeds. Also, the
wheels, axles, drive train, steering and
brakes must all be in good condition.
CAUTION
Use extreme caution when towing ve-
hicles. Avoid sudden starts or erratic
driving maneuvers which would place
excessive stress on the emergency
towing eyelet and towing cable or
chain. The eyelet and towing cable or
chain may break and cause serious
injury or damage.
NOTICE
Use only a cable or chain specifically
intended for use in towing vehicles.
Securely fasten the cable or chain to
the towing eyelet provided.
Before towing, release the parking brake
and put the transmission in “N”. The key
must be in “ACC” (engine off) or “ON”
(engine running).
CAUTION
If the engine is not running, the pow-
er assist for the brakes and steering
will not work so steering and braking
will be much harder than usual.
—Emergency towing

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2322003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
1. Pull up the deck board and remove the
front towing eyelet by turning it coun-
terclockwise. (For the towing eyelet
location, see “—Required tools and
spare tire” on page 221 in this sec-
tion.)2. Remove the front towing eyelet coveron the front bumper by pushing the
outside of the cover.3. Secure it to the hole on the bumper byturning clockwise.
—Installing front towing eyelet

’03 HIGHLANDER_U (L/O 0208)
2332003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
4. Tighten the front towing eyelet securely
by a wheel nut wrench.
CAUTION
When installing the eyelet on the ve-
hicle, be sure to tighten the front
eyelet securely. If the tightening is
loose, it may come off when being
towed and result in death or serious
injury.
Before emergency towing, check that
the eyelet is not broken or damaged
and that the installation bolts are not
loose.
Fasten the towing cable or chain se-
curely to the eyelet.
Do not jerk the eyelet. Apply steady
and even force.
To avoid damaging the eyelet, do not
pull from the side or at a vertical
angle. Always pull straight ahead.
CAUTION
If the emergency towing eyelet is
used to get out when your vehicle
becomes struck in mud, sand or oth-
er condition from which the vehicle
cannot be driven out under its own
power, make sure to observe the pre-
cautions mentioned below. Otherwise,
excessive stress will be put on the
eyelet and the towing cable or chain
may break, causing serious injury or
damage.
If the towing vehicle can hardly
move, do not forcibly continue the
towing. Contact your Toyota dealer
or a commercial tow truck service
for assistance.
Tow the vehicle as straight ahead
as possible.
Keep away from the vehicle during
towing.
—Emergency towing eyelet
precautions

’03 HIGHLANDER_U (L/O 0208)
2472003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
If you are a skilled doityourself mechan-
ic, the Toyota service manuals are recom-
mended. Please be aware that doityour-
self maintenance can affect your warranty
coverage. See “Owner ’s Warranty Informa-
tion Booklet” or “Owner ’s Manual Supple-
ment” for the details. Listed below are the general maintenance
items that should be performed as fre-
quently as specified. In addition to check-
ing the items listed, if you notice any
unusual noise, smell or vibration, you
should investigate the cause or take your
vehicle to your Toyota dealer or a quali-
fied service shop immediately. It is recom-
mended that any problem you notice be
brought to the attention of your dealer or
the qualified service shop for their advice.
CAUTION
Make these checks only where ade-
quate ventilation can be obtained if
you run the engine.
OUTSIDE THE VEHICLE
Items listed below should be performed
from time to time, unless otherwise
specified.
Tire pressure
Check the pressure with a gauge every
two weeks, or at least once a month. See
page 267 in Section 72 for additional
information.Tire surface and wheel nuts
Check the tires carefully for cuts, damage
or excessive wear. See page 268 in Sec-
tion 72 for additional information. When
checking the tires, make sure no nuts are
missing, and check the nuts for loose-
ness. Tighten them if necessary.
Tire rotation
Rotate the tires according to the
maintenance schedule. (For scheduled
maintenance information, please refer to
the “Scheduled Maintenance Guide” or
“Owner ’s Manual Supplement”.) See page
270 in Section 72 for additional
information.
Fluid leaks
Check underneath for leaking fuel, oil, wa-
ter or other fluid after the vehicle has
been parked for a while. If you smell fuel
fumes or notice any leak, have the cause
found and corrected immediately.
Doors and engine hood
Check that all side doors and back door
operate smoothly and all latches lock se-
curely. Make sure the engine hood sec-
ondary latch secures the hood from open-
ing when the primary latch is released.
General maintenance

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2482003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
INSIDE THE VEHICLE
Items listed below should be checked
regularly, e.g. while performing periodic
services, cleaning the vehicle, etc.
Lights
Make sure the headlights, stop lights, tail
lights, turn signal lights, and other lights
are all working. Check headlight aim.
Service reminder indicators and warning
buzzers
Check that all service reminder indicators
and warning buzzers function properly.
Steering wheel
Check that it has the specified free play.
Be alert for changes in steering condition,
such as hard steering or strange noise.
Seats
Check that all seat controls such as seat
adjusters, seatback recliner, etc. operate
smoothly and that all latches lock securely
in any position. Check that the head re-
straints move up and down smoothly and
that the locks hold securely in any latched
position. For foldingdown rear seatbacks,
check that the latches lock securely. Seat belts
Check that the seat belt system such as
buckles, retractors and anchors operate
properly and smoothly. Make sure the belt
webbing is not cut, frayed, worn or dam-
aged.
Accelerator pedal
Check the pedal for smooth operation and
uneven pedal effort or catching.
Brake pedal
Check the pedal for smooth operation and
that the pedal has the proper clearance.
Check the brake booster function.
Brakes
At a safe place, check that the brakes do
not pull to one side when applied.
Parking brake
Check that the pedal has the proper travel
and that, on a safe incline, your vehicle
is held securely with only the parking
brake applied.
Automatic transmission “Park” mecha-
nism
Check the lock release button of the se-
lector lever for proper and smooth opera-
tion. On a safe incline, check that your
vehicle is held securely with the selector
lever in “P” position and all brakes re-
leased.
IN THE ENGINE COMPARTMENT
Items listed below should be checked
from time to time, e.g. each time when
refueling.
Washer fluid
Make sure there is sufficient fluid in the
tank. See page 279 in Section 73 for
additional information.
Engine coolant level
Make sure the coolant level is between
the “F” and “L” lines on the seethrough
reservoir when the engine is cold. See
page 263 in Section 72 for additional
information.
Radiator, condenser and hoses
Check that the front of the radiator and
condenser are clean and not blocked with
leaves, dirt or insects. See page 264 in
Section 72 for additional information.

’03 HIGHLANDER_U (L/O 0208)
2902003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
Engine compartment
Instrument panel
Fuses (type A)
1. STARTER 7.5 A: Multiport fuel injection
system/s equential multiport fuel injec-
tion system
2. ABS3 7.5 A: Vehicle skid control sys-
tem
3. HEAD LP RH LWR 15 A: Righthand
headlight (low beam)
4. HEAD LP LH LWR 15 A: Lefthand
headlight (low beam)
5. A/F 25 A: Air fuel ratio sensor
6. ALTS 7.5 A: Charging system
7. TOWING 20 A: Trailer lights
Engine compartment
(with daytime running light system)
8. HORN 10 A: Horns
9. SECURITY 15 A: Theft deterrent sys-
tem
10. HEAD LP RH UPR 10 A: Righthand
headlight (high beam)
11. ECUB 7.5 A: Theft deterrent system,
air conditioning system, vehicle skid
control system, gauges and meters,
wireless remote control system, power
door lock
12. EFI 20 A: Multiport fuel injection sys-
tem/sequential multiport fuel injection
system, fuel pump, engine immobiliser
system
Fuses

’03 HIGHLANDER_U (L/O 0208)
2912003 HIGHLANDER from Aug. ’02 Prod. (OM48441U)
13. DOOR LOCK 25 A: Power door lock
system, theft deterrent system
14. HEAD LP LH UPR 10 A: Lefthand
headlight (high beam)
15. RADIO NO.1 25 A: Car audio system
16. DOME 10 A: Personal light, interior
lights, vanity mirror lights, ignition
switch light, wireless remote control
system, g auges and meters
17. HAZARD 15 A: Emergency flashers,
instrument panel light
18. SPARE 7.5 A: Spare fuse
19. SPARE 15 A: Spare fuse
20. SPARE 25 A: Spare fuse
21. IGN 7.5 A: Gauges and meters, SRS
airbag system
22. RADIO NO.2 7.5 A: Car audio system
23. CIG 15 A: Cigarette lighter
24. D RR DOOR 20 A: Power windows
25. PWR OUTLET 15 A: Power outlets
26. FR FOG 10 A: Front fog lights
27. SRSIG 15 A: SRS airbag system
28. ECUIG 15 A: Electric moon roof,
antilock brake system, vehicle skid
control system, shift lock system,
charging system, cruise control system,
emergency flashers, starting system 29. WIPER 25 A:
Windshield wipers and
washer
30. P RR DOOR 20 A: Power windows
31. P FR DOOR 25 A: Power windows,
door courtesy lights, power door lock
system
32. S/ROOF 20 A: Electric moon roof
33. HEATER 15 A: Air conditioning system,
electric cooling fan, rear defogger, out-
side rear view mirror defogger, gauges
and meters
34. IG1 7.5 A: Backup lights, vehicle skid
control system, multiport fuel injection
system/s equential multiport fuel injec-
tion system, outside rear view mirror
heaters, power door lock system, wire-
less remote control system
35. RR WIP 15 A: Rear window wiper
36. STOP 20 A: Stop lights, high mounted
stoplight, antilock brake system, ve-
hicle skid control system, shift lock
system, cruise control system, multiport
fuel injection system/sequential multi-
port fuel injection system
37. OBD 7.5 A: Onboard diagnosis sys-
tem
38. SEAT HTR 15 A: Seat heaters 39. IG2 15 A:
Multiport fuel injection sys-
tem/sequential multiport fuel injection
system, charging system, starter sys-
tem
40. WASHER 20 A: Washer fluid level
warning light
41. RR FOG 7.5 A: No circuit
42. FR DEF 20 A: Air conditioning system,
outside rear view mirror defoggers
43. D FR DOOR 20 A: Power windows,
door courtesy lights
44. TAIL 10 A: Tail lights, license plate
lights, instrument panel lights, front fog
lights, front side marker lights, rear
side marker lights, parking lights
45. PANEL 7.5 A: Instrument panel lights
46. DRL 7.5 A: Daytime running light sys-
tem
Fuses
(type B)
47. AM2 30 A: Multiport fuel injection sys-
tem/sequential multiport fuel injection
system, starting system
48. ABS2 40 A: Antilock brake system,
vehicle skid control system
49. ABS1 40 A: Antilock brake system,
vehicle skid control system
50. HEATER 50 A: Air conditioning system