2004 TOYOTA CELICA ECU

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2004 CELICA from Aug. ’03 Prod. (OM20823U)
Exhaust system
If you notice any change in the sound of
the exhaust or smell exhaust fumes, have
the cause located and corrected immedi-
ately. (See “Engine exhaust cautions” in
Section 2.)
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.
Service reminder indicators and warning
buzzers
Check that all service reminder indicators
and warning buzzers function properly.
Steering wheel
Be alert for changes in steering condition,
such as hard steering or strange noise.
Seats
Check that all front seat controls such as
seat adjusters, seatback recliner, etc. op-
erate smoothly and that all latches lock
securely in any position. For folding−down
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.
Clutch pedal
Check the pedal for smooth operation.
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 lever 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.
OUTSIDE THE VEHICLE
Items listed below should be performed
from time to time, unless otherwise
specified.
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 doors including back door
operate smoothly and all latches lock se-
curely. Make sure the engine hood secon-
dary latch secures the hood from opening
when the primary latch is released.

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2004 CELICA from Aug. ’03 Prod. (OM20823U)
2. Unplug the connector. Remove therubber cover.
If the connector is tight, wiggle it.3. Release the bulb retaining spring and remove the bulb along with the
socket. Install a new bulb into the
socket and return the bulb retaining
spring to its original position.
To install a bulb, align the tabs of the
bulb with the cutout of the mounting hole.4. Install the rubber cover with the “TOP” mark upward, and fit it se-
curely on the boss. Plug in the con-
nector.
Make sure the rubber cover fits securely
on the bulb base and the mounting body.
Aiming is not necessary after replacing
the bulb. When aiming adjustment is nec-
essary, contact your Toyota dealer.

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2004 CELICA from Aug. ’03 Prod. (OM20823U)
Engine compartment
Engine compartment
Fuses (type A)1. AUTO ANTENNA 15 A: Power antenna
2. HEAD LH UPR 10 A: No circuit
3. HEAD RH UPR 20 A: No circuit
4. HEAD LVL DRL NO.1 7.5 A: Daytime
running light system, headlight beam
level control system
5. HEAD RH LWR 15 A: Right−hand
headlight (low beam)
6. HEAD LH LWR 15 A: Left−hand head-
light (low beam)
7. ABS NO.2 25 A: Anti−lock brake sys-
tem
Instrument panel
8. SPARE 30 A: Spare fuse
9. HORN 10 A: Horn
10. ALTS 7.5 A: Charging system
11. SPARE 15 A: Spare fuse
12. EFI NO.1 10 A: Multiport fuel injection
system/s equential multiport fuel injec-
tion system
13. DCC 25 A: “RADIO”, “DOME”, “MPX −
B” and “ECU −B” fuses
14. SPARE 10 A: Spare fuse
15. EFI NO.2 10 A: Multiport fuel injection
system/s equential multiport fuel injec-
tion system, emission control system
Fuses

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2004 CELICA from Aug. ’03 Prod. (OM20823U)
16. EFI 20 A: Multiport fuel injection sys-
tem/sequential multiport fuel injection
system, “EFI NO.1” and “EFI NO.2”
fuses
17. ST 7.5 A: Starting system, multiport
fuel injection system/sequential multi-
port fuel injection system
18. AM2 7.5 A: Starting system
19. IG2 15 A: Starting system, multiport
fuel injection system/sequential multi-
port fuel injection system
20. HAZ 10 A: Emergency flashers
21. ETCS 10 A: Electronic throttle control
system
22. HEAD RH UPR 10 A: Right−hand
headlight (high beam)
23. HEAD LH UPR 10 A: Left−hand head-
light (high beam), daytime running light
system
24. S/ROOF 15 A: Electric moon roof
25. FL P/W 20 A: Power windows
26. STOP 10 A: Stop lights, anti −lock
brake system, high mounted stoplight,
multiport fuel injection system/sequen-
tial multiport fuel injection system, elec-
tronically controlled automatic transmis-
sion system, cruise control system 27. SRSIG 7.5 A:
SRS airbag system
28. WASHER 15 A: Windshield washer,
rear window washer
29. RADIO 15 A: Car audio system
30. TURN 7.5 A: Turn signal lights
31. HTR 10 A: Air conditioning system
32. TAIL 10 A: Tail lights, instrument panel
lights, license plate lights, front side
maker lights
33. CIG 15 A: Cigarette lighter
34. AM1 25 A: Starting system, “CIG”,
“ECU ACC”, “SRS −IG”, “WASHER”,
“WIPER”, “BK/UP LP”, “TENS RDC”,
“DEF RLY”, “BODY ECU −IG”, “TURN”,
“HTR”, “WARNING”, “FAN RLY”, “ABS −
IG” and “ECU −IG” fuses
35. DOOR 20 A: Power door lock system
36. FR FOG 15 A: Front fog lights
37. OBD 7.5 A: On−board diagnosis sys-
tem
38. WIPER 25 A: Windshield wipers
39. MIR HTR 10 A: No circuit
40. RR WIPER 15 A: Rear window wiper
41. FR P/W 20 A: Power windows Fuses (type B)
42. SPARE 7.5 A: Spare fuse
43. a. MPXB 7.5 A: Wireless remote con-
trol system
b. RR FOG 7.5 A: No circuit
c. DOME 7.5 A: Clock, interior light
d. ECUB 7.5 A: Ai
r conditioning sys-
tem, gauges and meters
44. a. WARNING 5 A: Charging system,
gauges and meters
b. ECUIG 5 A: Cruise control system
c. ABSIG 5 A: Anti−lock brake sys-
tem
d. FAN RLY 5 A: Electric cooling
fan
45. a. PANEL1 7.5 A: Glove box light, in-
strument panel lights
b. PANEL2 7.5 A: Front fog lights, in-
strument panel lights, instrument
cluster lights
c. ECUACC 7.5 A: Clock, car audio
system, power rear view mirror con-
trols, power antenna

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2004 CELICA from Aug. ’03 Prod. (OM20823U)
46. a. BK/UP LP 5 A: Back−up lights
b. DEF RLY 5 A: Power windows, rear
window defogger
c. BODY ECUIG 5 A: Multiplex com-
munication system
d. TENS RDC 5 A: Electronically con-
trolled automatic transmission sys-
tem, shift lock control system, elec-
tric moon roof, power antenna
Fuses (type C)
47. HTR 50 A: Air conditioning system
48. RDI 30 A: Electric cooling fan
49. ABS NO.1 50 A: Anti−lock brake sys-
tem
50. CDS 30 A: Electric cooling fan
51. MAIN 40 A: Starting system, daytime
running light system, “ST” fuse
52. APMP 50 A: Emission control system
53. HLP CLN 50 A: No circuit
54. DEF 30 A: Rear window defogger
Fuses (type D)
55. ALT 120 A: Cooling system, electric
cooling fan, starting system, rear win-
dow defogger, tail lights, “ABS NO.1”,
“ABS NO.2”, “HTR”, “FR P/W”, “FL
P/W”, “DOOR”, “OBD”, “STOP”, “S/
ROOF”, “MIR HTR”, “FR FOG” and
“AM1” fuses