Scion Q EV. Service Manual - part 19

302

7-3. Do-it-yourself maintenance



Motor compartment (type B fuse box)

1. Press the claw and remove the

washer inlet from the bracket.

2. Push the tab in and lift the lid

off.

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

Under the driver’s side instrument panel

Remove the lid.

Remove the fuse with the pull-
out tool.

Only type A fuse can be
removed using the pullout tool.

4

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7-3. Do-it-yourself maintenance

Check if the fuse is blown.

Normal fuse

Blown fuse

Replace the blown fuse with a new fuse of an appropriate amperage rat-
ing. The amperage rating can be found on the fuse box lid.

5

1
2



Type A



Type B



Type C

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■

Motor compartment (type A fuse box)

Fuse layout and amperage ratings

Fuse

Ampere

Circuit

1

D/C CUT

30 A

ECU-B NO.1, DOME

2

IMMOBI

7.5 A

Smart key system

3

TURN & HAZ

10 A

Turn signal lights, emergency flashers

4

DCM

5 A

Navigation system

5

ECU-B NO.2

7.5 A

Power management ECU, air condition-
ing system

6

AM2

7.5 A

Power management ECU

7

H-LP MAIN LO

20 A

Headlight (low beam)

8

ABS MTR NO.1

30 A

Electric control brake system

9

SPARE

30 A

Spare fuse

10 SPARE

20 A

Spare fuse

11 SPARE

7.5 A

Spare fuse

12 IG CT

30 A

IGCT NO.2, PCU, IGCT NO.3, INV W/P

13 ECU-B NO.3

7.5 A

EV system

14 PI

30 A

DCDC-S, HORN, BATT FAN, IG2, IG2
NO.2

15 STRG LOCK

20 A

Steering lock system

16 H-LP MAIN HI

25 A

Headlight (high beam)

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7-3. Do-it-yourself maintenance

17 DOME

10 A

Navigation system, interior light

18 ECU-B NO.1

7.5 A

Smart key system, main body ECU,
enhanced VSC

19 RDI

5 A

Radiator fan

20 DEFOGGER

30 A

Rear window defogger

21 BK/UP

10 A

Back-up lights

22 ABS NO.2

7.5 A

Electric control brake system

23 RDI

30 A

Radiator fan

24 HTR-B

40 A

Air conditioning system

25 ABS NO.2

30 A

Electric control brake system

26 HORN

10 A

Horn

27 BATT FAN

15 A

Battery cooling fan, power management
ECU

28 DCDC-S

5 A

EV system

29 IG2

10 A

Power management ECU, electric con-
trol brake system

30 IG2 NO.2

5 A

Smart key system, steering lock system,
meter, navigation system

Fuse

Ampere

Circuit

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Motor compartment (type B fuse box)

Fuse

Ampere

Circuit

1

PCU

20 A

EV system

2

IGCT NO.2

10 A

EV system

3

IGCT NO.3

10 A

EV system, power management ECU

4

INV W/P

15 A

EV system

5

HWD NO.1

50 A

Heated windshield defroster

6

PIMR

10 A

EV system, power management ECU

7

ABS NO.1

20 A

Electric control brake system

8

HWD NO.2

50 A

Heated windshield defroster

9

H-LP RH HI

10 A

Right-hand headlight (high beam)

10 H-LP LH HI

10 A

Left-hand headlight (high beam)

11 H-LP RH LO

10 A

Right-hand headlight (low beam)

12 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

Enhanced VSC, shift lock control system,
electric power steering, main body ECU,
tire pressure warning system, electric
control brake system, air conditioning
system

2

GAUGE

10 A

Rear window defogger, instrument panel
light control, emergency flashers, front
passenger’s seat belt reminder light, nav-
igation system

3

HTR-IG

10 A

Air conditioning system, switch illumina-
tion

4

WASHER RR

10 A

Rear window washer

5

WIPER RR

10 A

Rear window wiper

6

WIPER FR

25 A

Front windshield wiper

7

WASHER FR

10 A

Front windshield washer

8

OBD

7.5 A

On-board diagnosis system

9

DOOR NO.2

20 A

Power windows

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, navigation
system, main body ECU

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14 PANEL NO.1

5 A

Switch illumination, meter

15 TAIL

10 A

Parking lights, side marker lights, tail
lights, license plate lights, main body
ECU

16 (FOG FR)

15 A

No circuit

17 AM1

7.5 A

No circuit

18 STOP

10 A

Power management ECU, stop lights,
high mounted stoplight, electric control
brake system

19 (SEAT-HTR)

15 A

Seat heaters

Fuse

Ampere

Circuit

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7-3. Do-it-yourself maintenance

■

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. 311)

●

If the replaced fuse blows again, have the vehicle inspected by your Scion
dealer.

■

If there is an overload in a circuit

The fuses are designed to blow, protecting the wiring harness from damage.

CAUTION

■

To prevent system breakdowns and vehicle fire

Observe the following precautions.
Failure 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 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.

●

Do not modify the fuses or fuse boxes.

■

Fuse box near the power control unit

Never check or replace the fuses as there are high voltage parts and wiring
near the fuse box.
Doing so may cause electric shock, resulting in death or serious injury.

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

Check the wattage of the light bulb to be replaced. (

P. 401)

■

Front

You may replace the following bulbs by 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.

Preparing for light bulb replacement

Bulb locations

Front turn signal lights

Headlight low beams

Parking/front side marker lights

Headlight high beams

1
2
3
4

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Rear

Rear turn signal lights

Stop/tail and rear side marker lights

License plate lights

Back-up lights

1
2
3
4

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Headlight low beams



Left side

Push the tab in and lift the lid
off.

Turn the cover clockwise and
remove it.

Replacing light bulbs

1

2

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7-3. Do-it-yourself maintenance

Turn the bulb base counter-
clockwise.

Unplug the connector while
pulling the lock release.

Replace the light bulb, and
install the bulb base.

Align the 3 tabs on the light bulb
with the mounting, and insert.

Turn and secure the bulb
base.

Shake the bulb base gently to
check that it is not loose, turn
the headlights on once and visu-
ally confirm that no light is leak-
ing through the mounting.

When replacing the left side bulb, install by conducting step 
with the directions reversed.

3

4

5

6

7

1

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

Right side

Press the claw and remove
the washer inlet from the
bracket.

Turn the cover counterclock-
wise and remove it.

1

2

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7-3. Do-it-yourself maintenance

Turn the bulb base counter-
clockwise.

Unplug the connector while
pulling the lock release.

Replace the light bulb, and
install the bulb base.

Align the 3 tabs on the light bulb
with the mounting, and insert.

Turn and secure the bulb
base.

Shake the bulb base gently to
check that it is not loose, turn
the headlights on once and visu-
ally confirm that no light is leak-
ing through the mounting.

When replacing the right side bulb, install by conducting step 
with the directions reversed.

3

4

5

6

7

1

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Headlight high beams



Left side

Push the tab in and lift the lid
off.

Turn the cover clockwise and
remove it.

1

2