TOYOTA tC 2012 Owners Manual (in English)

331
4-3. Do-it-yourself maintenance
4
Maintenance and care
Scion_tC_U_(OM21041U)
Driver’s side instrument panel
Remove the instrument panel.
After a system failure, see “Fuse layout and amperage rat-
ings” ( P. 333) for details about which fuse to check.
Remove the fuse.
Only type A fuses can be
removed using the pullout
tool.
STEP 3
STEP 4

332 4-3. Do-it-yourself maintenance
Scion_tC_U_(OM21041U)
Check if the fuse is blown.
Ty p e A Normal fuse
Blown fuse
Replace the blown fuse with a
new fuse of an appropriate
amperage rating. The amper-
age rating can be found on the
fuse box lid.
Ty p e B
Normal fuse
Blown fuse
Replace the blown fuse with a
new fuse of an appropriate
amperage rating. The amper-
age rating can be found on the
fuse box lid.
Ty p e CNormal fuse
Blown fuse
Contact your Scion dealer.
STEP 5

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4-3. Do-it-yourself maintenance
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Maintenance and care
Scion_tC_U_(OM21041U)
Fuse layout and amperage ratings
■ Engine compartment
FuseAmpereCircuit
1
FAN NO.230 AElectric cooling fan
2 FAN NO.1 40 A Electric cooling fan
3 ABS NO.2 30 A ABS, VSC
4 ABS NO.1 50 A ABS, VSC
5 HTR 50 A Air conditioning system
6 ALT 120 A Charging system
7 EPS 80 A Electric power steering system
8 P/I-B 50 A EFI NO.1, EFI NO.2, HORN, IG2

334 4-3. Do-it-yourself maintenance
Scion_tC_U_(OM21041U)
9 H-LP MAIN 50 AH-LP LH-LO, H-LP RH-LO, H-LP
LH-HI, H-LP RH-HI, headlights,
daytime running light system
10 SPARE 10 A Spare fuse
11 SPARE 20 A Spare fuse
12 SPARE 30 A Spare fuse
13 H-LP RH-HI 10 A Right hand headlight (high beam),
gauges and meters
14 H-LP LH-HI 10 A Left hand headlight (high beam)
15 H-LP RH-LO 10 A Right hand headlight (low beam),
gauges and meters
16 H-LP LH-LO 10 A Left hand headlight (low beam)
17 ETCS 10 A Multiport fuel injection system/
sequential multiport fuel injection
system
18 HAZ 10 A Turn signal lights, emergency
flashers, gauges and meters
19 ALT-S 7.5 A Charging system
20 AM2 NO.2
*7.5 A Power management system
21 AM2 30 A IG2 NO.2, starting system
22 STRG LOCK
*20 A Steering lock system
23 AMP 30 A Audio system
24 MIR HTR 10 A Outside rear view mirror defoggers,
multiport fuel injection system/
sequential multiport fuel injection
system
FuseAmpereCircuit

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4-3. Do-it-yourself maintenance
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Maintenance and care
Scion_tC_U_(OM21041U)
25 ECU-B NO.2 10 A
Automatic transmission, power
windows, clock, smart key system,
wireless remote control, front pas-
senger occupant classification sys-
tem
26 ECU-B 10 ABody ECU, gauges and meters,
steering sensor, wireless remote
control, smart key system
27 RAD NO.1 15 A Audio system
28 DOME 10 AInterior light, personal light, lug-
gage compartment light
29 STOP 10 AMultiport fuel injection system/
sequential multiport fuel injection
system, ABS, VSC, automatic
transmission, shift lock system,
stop lights, high mounted stoplight,
power management system
FuseAmpereCircuit

336 4-3. Do-it-yourself maintenance
Scion_tC_U_(OM21041U)
*: Vehicles with a smart key system only
30 DEF 40 A MIR HTR, rear window defoggers
31 EFI NO.2 15 A
Multiport fuel injection system/
sequential multiport fuel injection
system, fuel pump
32 EFI NO.1 15 A Multiport fuel injection system/
sequential multiport fuel injection
system, automatic transmission
33 HORN 10 A Horn
34 IG2 15 A MET, IGN, Multiport fuel injection
system/sequential multiport fuel
injection system
FuseAmpereCircuit

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4-3. Do-it-yourself maintenance
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Maintenance and care
Scion_tC_U_(OM21041U)
■
Under the driver’s side instrument panel
FuseAmpereCircuit
1S/ROOF30 AMoon roof
2 FOG FR 15 A No circuit
3 FOG RR 7.5 A No circuit
4 AM1 5 A Starting system, body ECU
5 OBD 7.5 A On-board diagnosis system
6 D/L 20 A Power door lock system
7 DOOR FR 20 A Power windows
8 WASHER RR 7.5 A Rear window washer
9 WASHER FR 10 A Windshield washer
10 WIP RR 15 A Rear window wiper 11 WIP FR 30 A Windshield wipers
12 PWR OUTLET 15 A Power outlet
13 ECU-IG1 NO.1 5 A Electric power steering, shift lock
system, moon roof, tire pressure
warning system, charging system,
paddle shift switches

338 4-3. Do-it-yourself maintenance
Scion_tC_U_(OM21041U)
14 ACC5 ABody ECU, clock, outside rear view
mirror, shift lock system, audio sys-
tem
15 IG 5 ARear window defoggers, electric
cooling fan, multiport fuel injection
system/sequential multiport fuel
injection system
16 TAIL 10 AParking lights, tail lights, side
marker lights, license plate lights,
multiport fuel injection system/
sequential multiport fuel injection
system
17 IGN 7.5 AMultiport fuel injection system/
sequential multiport fuel injection
system, automatic transmission,
clock, smart key system, steering
lock system, SRS airbag system,
fuel pump, front passenger occu-
pant classification system
18 PANEL 5 AGauges and meters, air condition-
ing system, seat heater, VSC OFF
switch, shift lever illumination,
steering switch, clock, audio sys-
tem
19 S/HTR FL 10 A Seat heater (driver’s side)
20 MET 7.5 A Gauges and meters
FuseAmpereCircuit

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4-3. Do-it-yourself maintenance
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Maintenance and care
Scion_tC_U_(OM21041U)
■
Driver’s side instrument panel
21 S/HTR FR 10 ASeat heater (front passenger’s
side)
22 IG2 NO.2 7.5 A Starting system
23 BKUP LP 7.5 ABack-up light, automatic transmis-
sion, multiport fuel injection sys-
tem/sequential multiport fuel
injection system
24 ECU-IG1 NO.2 5 A Body ECU, ABS, VSC, steering
sensor, yaw rate & G sensor
25 ECU-IG1 NO.3 5 A Turn signal lights, emergency
flashers
26 HTR-IG 7.5 A Air conditioning system
FuseAmpereCircuit
1DOOR FL30 APower windows
FuseAmpereCircuit

340 4-3. Do-it-yourself maintenance
Scion_tC_U_(OM21041U)
■After a fuse is replaced
● If the lights do not turn on even after the fuse has been replaced, a bulb
may need replacement. (P. 341)
● If the replaced fuse blows again, have the vehicle inspected by your
Scion dealer.
■ If there is an overload in the circuits
The fuses are designed to blow, protecting the wiring harness from damage.
CAUTION
■To prevent system breakdowns and vehicle fire
Observe the following precautions. 
Failing to do so may cause damage, and possibly a fire or injury.
● Never use a fuse of a higher amperage rating than that indicated, or use
any other object in place of a fuse.
● Always use a genuine Scion fuse or equivalent. 
Never replace a fuse with a wire, even as a temporary fix. 
This can cause extensive damage or even fire.
● Do not modify the fuse or the fuse box.
NOTICE
■Before replacing fuses
Have the cause of electrical overload determined and repaired by your Scion
dealer, as soon as possible.