Scion iQ. Service Manual - part 15

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4-3. Do-it-yourself maintenance

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Engine compartment (type B)

Fuse

Ampere

Circuit

1

D/C CUT

30 A

ECU-B NO.1, DOME

2

IMMOBI

7.5 A

IMMOBI

3

TURN & HAZ

10 A

Turn signal lights, emergency 
flashers

4

ETCS

10 A

Electronic throttle control system

5

ECU-B NO.2

5 A

Meter, power windows, air condi-
tioning system

6

H-LP MAIN

20 A

H-LP RH LO, H-LP LH LO

7

SPARE

30 A

Spare fuse

8

SPARE

20 A

Spare fuse

9

SPARE

5 A

Spare fuse

10

AM2 NO.1

30 A

Starting system

11

H-LP MAIN HI

25 A

H-LP RH HI, H-LP LH HI

12

DOME

15 A

Interior light, audio system

13

ECU-B NO.1

7.5 A

Main body ECU, power door lock 
system

14

MIR HTR

7.5 A

Outside rear view mirror defoggers

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4-3. Do-it-yourself maintenance

15

DEFOGGER

30 A

Rear window defogger

16

EPS

50 A

Electric power steering

17

RDI

30 A

RDI FAN

18

ABS NO.1

50 A

Vehicle stability control system

19

HTR-B

40 A

HTR, BLR

20

ABS NO.2

30 A

Vehicle stability control system

21

HORN

10 A

Horn

22

EFI-MAIN

20 A

Multiport fuel injection system/
sequential multiport fuel injection 
system, EFI NO.1, Fuel pump

23

ALT-S

7.5 A

Charging system

24

IGN

15 A

Injection, igniter

25

IG2

10 A

SRS airbag system, meter

26

EFI NO.1

10 A

Multiport fuel injection system/
sequential multiport fuel injection 
system

Fuse

Ampere

Circuit

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4-3. Do-it-yourself maintenance

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Engine compartment (type C)

Fuse

Ampere

Circuit

1

PTC NO.1

50 A

PTC heater

2

PTC NO.3

30 A

PTC heater

3

PTC NO.2

30 A

PTC heater

4

H-LP RH HI

10 A

Headlight (high beam)

5

H-LP LH HI

10 A

Headlight (high beam)

6

H-LP RH LO

10 A

Right-hand headlight (low beam)

7

H-LP LH LO

10 A

Left-hand headlight (low beam)

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Under the driver’s side instrument panel

Fuse

Ampere

Circuit

1

ECU-IG NO.1

7.5 A

Vehicle stability control system, 
shift lock control system, electric 
power steering, automatic head-
light system, main body ECU, tire 
pressure warning system

2

GAUGE

10 A

Electric cooling fan, charging sys-
tem, emergency flashers, front 
passenger’s seat belt reminder 
light, back-up lights, multiport fuel 
injection system/sequential multi-
port fuel injection system, wind-
shield wiper ECU

3

HTR-IG

10 A

Air conditioning system, rear win-
dow defogger

4

WASHER RR

10 A

Windshield washer

5

WIPER RR

10 A

Rear window wiper

6

WIPER FR

25 A

Windshield wipers

7

WASHER FR

10 A

Windshield washer

8

OBD

7.5 A

On-board diagnosis system

9

DOOR NO.2

20 A

Power windows

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10

D/L NO.1

15 A

Power door lock system, main 
body ECU

11

DOOR NO.1

30 A

Power windows

12

CIG

15 A

Power outlet

13

ACC

5 A

Outside rear view mirrors, audio 
system, shift lock control system, 
main body ECU

14

PANEL NO.1

5 A

Meter

15

TAIL

10 A

Parking lights, tail lights, license 
plate lights, multiport fuel injection 
system/sequential multiport fuel 
injection system, instrument clus-
ter, windshield wiper ECU

16

(FOG FR)

15 A

No circuit

17

AM1

7.5 A

ACC, starting system

18

STOP

10 A

Vehicle stability control system, 
power management ECU, shift 
lock control system, stop lights, 
multiport fuel injection system/
sequential multiport fuel injection 
system

19

(SEAT-HTR)

15 A

No circuit

■

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. 255)

●

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.

Fuse

Ampere

Circuit

254

4-3. Do-it-yourself maintenance

CAUTION

■

To prevent system breakdowns and vehicle fire

Observe the following precautions.
Failing to do so may cause damage to the vehicle, and possibly a fire or
injury.

●

Never use a fuse of a higher amperage rating than 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.

●

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.

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Light bulbs

You may replace the following bulbs yourself. The difficulty level of

replacement varies depending on the bulb. If necessary bulb

replacement seems difficult to perform, contact your Scion dealer.

For more information about replacing other light bulbs, contact your

Scion dealer.

■

Prepare a replacement light bulb.

Check the wattage of the light bulb being replaced. (

P. 328)

■

Front bulb locations

Headlight (low beam)

Parking/front 
side marker 
light

Headlights (high beam) and 
daytime running light

Front turn signal light

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4-3. Do-it-yourself maintenance

Replacing light bulbs

■

Headlight low beams

Left side

Push the tab in and lift the lid off.

■

Rear bulb locations

Back-up light

Rear turn signal light

Stop/tail and rear 
side marker light

License plate light

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Turn the cover clockwise.

Turn the bulb base counterclock-
wise.

Unplug the connector while
depressing the lock release.

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4-3. Do-it-yourself maintenance

Right side

Turn the cover counterclockwise.

Turn the bulb base counterclock-
wise.

Unplug the connector while
depressing the lock release.

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Headlight high beams and daytime running lights

Left side

Push the tab in and lift the lid off.

Turn the cover clockwise.

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4-3. Do-it-yourself maintenance

Turn the bulb base clockwise.

Unplug the connector while
depressing the lock release.

Right side

Turn the cover counterclockwise.

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Turn the bulb base counterclock-
wise.

Unplug the connector while
depressing the lock release.

■

Parking/front side marker lights

Turn the bulb base counterclock-
wise.

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4-3. Do-it-yourself maintenance

Remove the light bulb.

■

Front turn signal lights

Turn the bulb base counterclock-
wise.

Remove the light bulb.

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Back-up lights, stop/tail and rear side marker lights and rear
turn signal lights

Open the back door. (

P. 33)

Folding down rear seatbacks. (

P. 40)

Remove the cover.

Use a flathead screwdriver which
is wrapped with a cloth.

Turn the bulb bases counter-
clockwise.

Stop/tail and rear side marker
light

Rear turn signal light

Back-up light

Remove the light bulb.

Stop/tail and rear side marker
light

Rear turn signal light

Back-up light

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4-3. Do-it-yourself maintenance

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License plate lights

Disengage the claws.

Use a flathead screwdriver which
is wrapped with a cloth.

Remove the license plate light.

Turn the bulb base counterclock-
wise.

Remove the light bulb.