Scion Q EV. Service Manual - part 21

334

8-2. Steps to take in an emergency

If you think something is wrong

● Fluid leaks under the vehicle

(Water dripping from the air conditioning after use is normal.)

● Flat-looking tires or uneven tire wear

● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the EV system

● Stumbling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, spongy feeling, pedal almost touches

the floor

If you notice any of the following symptoms, your vehicle proba-
bly needs adjustment or repair. Contact your Scion dealer as
soon as possible.

Visible symptoms

Audible symptoms

Operational symptoms

335

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8-2. Steps to take in an emergency

If a warning light turns on or a warning 

buzzer sounds

The following warning indicates a possible problem in the brake sys-
tem. Immediately stop the vehicle in a safe place and contact your
Scion dealer.

*

: Brake system warning buzzer:

When there is a possible problem that could affect braking performance,
the warning light will come on and a warning buzzer will sound.

Parking brake engaged warning buzzer:

A buzzer will sound if the vehicle is driven at a speed of approximately 3
mph (5 km/h) or more.

Calmly perform the following actions if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by your Scion dealer.

Stop the vehicle immediately. Continuing to drive the vehicle
may be dangerous.

Warning light

Warning light/Details

Brake system warning light (warning buzzer)

*

• Low brake fluid
• Malfunction in the brake system

This light also comes on when the parking brake is not
released. If the light turns off after the parking brake is
fully released the system is operating normally.

336

8-2. Steps to take in an emergency

The following warning indicates the possibility of damage to the vehi-
cle that may lead to an accident. Immediately stop the vehicle in a
safe place and contact your Scion dealer.

Failure to investigate the cause of the following warnings may lead to
the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Scion dealer immediately.

Stop the vehicle immediately.

Warning light

Warning light/Details

12-volt battery charging system warning light

Indicates a malfunction in the vehicle’s charging system.

Have the vehicle inspected by your Scion dealer immediately.

Warning light

Warning light/Details

SRS warning light

Indicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system; or
• The seat belt pretensioner system

ABS warning light

Indicates a malfunction in:
• The ABS; or
• The brake assist system

Electric power steering system warning light (warning
buzzer)

Indicates a malfunction in the EPS (Electric Power Steer-
ing) system.

(Comes on)

Slip indicator

Indicates a malfunction in:
• The VSC;
• The TRAC; or
• The hill-start assist control
Flashes during the above mentioned systems or ABS
operation. (

P. 211, 213)

Brake system warning light 

Indicates a malfunction in:
• The regenerative brake system; or
• The electronically controlled brake system

337

8-2. Steps to take in an emergency

8

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hen

 troub

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arises

After taking the specified steps to correct the suspected problem,
check that the warning light goes off.

Traction battery warning light

Traction battery inspection period.

(Flashes in 

yellow)

Plug-in indicator

Indicates a malfunction in the charging system circuit.

Follow the correction procedures.

Warning light

Warning light/Details

Warning light

Warning light/Details

Correction procedure

Output control warning
light

Restricts the EV system
output.

Check the warning message
that is shown on the multi-
information display. 
(

P. 347)

Open door warning light

(warning buzzer)

*

1

Indicates that two or more
of the doors is not fully
closed.

Make sure that all the doors
are closed.

(Flashes or 

comes on)

SOC (State of Charge)
warning light 
(warning buzzer)

Comes on: 
SOC (State of Charge)
gauge is two or less.
Flashes: 
SOC (State of Charge)
gauge is almost depleted.

Charge the vehicle.

(On the 

instrument 

cluster)

Driver’s seat belt reminder
light (warning buzzer)

*

2

Warns the driver to fasten
his/her seat belt.

Fasten the seat belt.

338

8-2. Steps to take in an emergency

(On the 

center panel)

Front passenger’s seat
belt reminder light 
(warning buzzer)

*

2

Warns the front passenger
to fasten his/her seat belt.

Fasten the seat belt.

Tire pressure warning
light

When the light comes on:
Low tire inflation pressure
such as

• Natural causes 

(

P. 340)

• Flat tire (

P. 359)

Adjust the tire inflation
pressure to the specified
level.

The light will turn off after
a few minutes. In case
the light does not turn off
even if the tire inflation
pressure is adjusted,
have the system checked
by your Scion dealer.

When the light comes on
after blinking for 1 minute:
Malfunction in the tire pres-
sure warning system 
(

P. 340)

Have the system checked
by your Scion dealer.

Master warning light

A buzzer sounds and the
warning light comes on
and flashes to indicate that
the master warning system
has detected a malfunc-
tion.

P. 344

Warning light

Warning light/Details

Correction procedure

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8-2. Steps to take in an emergency

8

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hen

 troub

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arises

*

1

: Open door warning buzzer:

A buzzer will sound if the vehicle reaches a speed of 3 mph (5 km/h) or
more with any door open.

*

2

: Driver’s and front passenger’s seat belt buzzer:

The driver’s and front passenger’s seat belt buzzer sounds to alert the
driver and front passenger that their seat belt is not fastened. Once the
power switch is turned to ON mode, the buzzer sounds for 6 seconds. The
buzzer sounds once if the driver’s or front passenger’s seat belt is unfas-
tened when the vehicle reaches a speed of 12 mph (20 km/h). Then, if the
seat belt is still unfastened after 30 seconds elapse, the buzzer will sound
intermittently for approximately 10 seconds, followed by a different tone for
approximately 20 more seconds.

■

SRS warning light

This warning light system monitors the airbag sensor assembly, front impact
sensors, side impact sensors (front door), side impact sensors (front), rear
impact sensors, driver’s seat position sensor, driver’s seat belt buckle switch,
front passenger occupant classification system (ECU and sensors), “AIR
BAG ON” indicator light, “AIR BAG OFF” indicator light, front passenger’s
seat belt buckle switch, seat belt pretensioners, airbags, interconnecting wir-
ing and power sources. (

P. 34) 

■

Front passenger detection sensor, passenger seat belt reminder and
warning buzzer

If luggage is placed on the front passenger seat, the front passenger detec-
tion sensor may cause the warning light to flash and the warning buzzer to
sound even if a passenger is not sitting in the seat.

■

Electric power steering system warning light (warning buzzer)

When the 12-volt battery charge becomes insufficient or the voltage tempo-
rarily drops, the electric power steering system warning light may come on
and warning buzzer may sound.

■

When the tire pressure warning light comes on

Check the tire inflation pressure and adjust to the appropriate level. Push-
ing the tire pressure warning reset switch will not turn off the tire pressure
warning light.

340

8-2. Steps to take in an emergency

■

The tire pressure warning light may come on due to natural causes

The tire pressure warning light may come on due to natural causes such
as natural air leaks and tire inflation pressure changes caused by temper-
ature. In this case, adjusting the tire inflation pressure will turn off the
warning light (after a few minutes).

■

If the tire pressure warning system is not functioning

The tire pressure warning system will be disabled in the following condi-
tions: 
(When the condition becomes normal, the system will work properly.)

●

If tires not equipped with tire pressure warning valves and transmitters
are used.

●

If the ID code on the tire pressure warning valves and transmitters is not
registered in the tire pressure warning computer.

●

If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm

2

 or bar) or

higher.

The tire pressure warning system may be disabled in the following conditions: 
(When the condition becomes normal, the system will work properly.)

●

If electronic devices or facilities using similar radio wave frequencies are
nearby.

●

If a radio set at similar frequency is in use in the vehicle.

●

If a window tint that affects the radio wave signals is installed.

●

If there is a lot of snow or ice on the vehicle, particular around the
wheels or wheel housings.

●

If non-genuine Scion wheels are used. (Even if you use Scion wheels,
the tire pressure warning system may not work properly with some types
of tires.)

●

If tire chains are used.

●

If emergency tire puncture repair kit is used.

■

If the tire pressure warning light frequently comes on after blinking
for 1 minute

If the tire pressure warning light frequently comes on after blinking for 1
minute when the power switch is turned to ON mode, have it checked by
your Scion dealer.

■

Warning buzzer

In some cases, the buzzer may not be heard because of noisy place or
an audio sound.

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8-2. Steps to take in an emergency

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■

Customization that can be configured at Scion dealer

The vehicle speed linked seat belt reminder buzzer can be disabled. 
(Customizable features: 

P. 414) However, Scion recommends that the

seat belt reminder buzzer be operational to alert the driver and front pas-
senger that the seat belts are not fastened.

CAUTION

■

If both the ABS and the brake system warning lights remain on

Stop your vehicle in a safe place immediately and contact your Scion
dealer. The vehicle will become extremely unstable during braking, and
the ABS system may fail, which could cause an accident resulting in
death or serious injury.

■

When the electric power steering system warning light comes on

The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold
firmly and operate using more force than usual.

■

If the tire pressure warning light comes on

Be sure to observe the following precautions. Failure to do so could
cause a loss of vehicle control and result in death or serious injury.

●

Stop your vehicle in a safe place as soon as possible. Adjust the tire
inflation pressure immediately. 

●

If the tire pressure warning light comes on even after tire inflation pres-
sure adjustment, it is probable that you have a flat tire. Check the tires.
If a tire is flat, repair the flat tire by using emergency tire puncture
repair kit.

●

Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate,
you could lose control of the steering wheel or the brakes.

■

If a blowout or sudden air leakage should occur

The tire pressure warning system may not activate immediately.

342

8-2. Steps to take in an emergency

CAUTION

■

Maintenance of the tires

Each tire, including the spare (if provided), should be checked monthly
when cold and inflated to the inflation pressure recommended by the
vehicle manufacturer on the vehicle placard or tire inflation pressure
label (tire and load information label). (If your vehicle has tires of a dif-
ferent size than the size indicated on the vehicle placard or tire inflation
pressure label [tire and load information label], you should determine
the proper tire inflation pressure for those tires.)

As an added safety feature, your vehicle has been equipped with a tire
pressure monitoring system (TPMS-tire pressure warning system) that
illuminates a low tire pressure telltale (tire pressure warning light) when
one or more of your tires is significantly under-inflated. Accordingly,
when the low tire pressure telltale (tire pressure warning light) illumi-
nates, you should stop and check your tires as soon as possible, and
inflate them to the proper pressure. Driving on a significantly under-
inflated tire causes the tire to overheat and can lead to tire failure.
Under-inflation also reduces fuel efficiency (for electric vehicles, traction
battery efficiency) and tire tread life, and may affect the vehicle’s han-
dling and stopping ability.

Please note that the TPMS (tire pressure warning system) is not a sub-
stitute for proper tire maintenance, and it is the driver’s responsibility to
maintain correct tire pressure, even if under-inflation has not reached
the level to trigger illumination of the TPMS low tire pressure telltale (tire
pressure warning light).

Your vehicle has also been equipped with a TPMS (tire pressure warn-
ing system) malfunction indicator to indicate when the system is not
operating properly. The TPMS (tire pressure warning system) malfunc-
tion indicator is combined with the low tire pressure telltale (tire pressure
warning light). When the system detects a malfunction, the telltale will
flash for approximately one minute and then remain continuously illumi-
nated. This sequence will continue upon subsequent vehicle start-ups
as long as the malfunction exists. When the malfunction indicator is illu-
minated, the system may not be able to detect or signal low tire pres-
sure as intended.

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8-2. Steps to take in an emergency

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CAUTION

TPMS (tire pressure warning system) malfunctions may occur for a vari-
ety of reasons, including the installation of replacement or alternate tires
or wheels on the vehicle that prevent the TPMS (tire pressure warning
system) from functioning properly. Always check the TPMS (tire pres-
sure warning system) malfunction telltale after replacing one or more
tires or wheels on your vehicle to ensure that the replacement or alter-
nate tires and wheels allow the TPMS (tire pressure warning system) to
continue to function properly.

NOTICE

■

Precaution when installing a different tire

When differently constructed tires or tires of different makers, models or
tread patterns are installed, the tire pressure warning system may not
operate properly.

344

8-2. Steps to take in an emergency

If a warning message is displayed

Master warning light

The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the multi-
information display.

Multi-information display

If any of the warning light comes on again after the following actions
have been performed, contact your Scion dealer.

The following warning indicates a possible problem in the brake sys-
tem. Immediately stop the vehicle in a safe place and contact your
Scion dealer.

If a warning is shown on the multi-information display, stay calm
and perform the following actions:

1

2

Stop the vehicle immediately. Continuing to drive the vehicle
may be dangerous.

Warning message

Details

Indicates the following:

• The electric control brake system; or,
• The regenerative brake system.

A buzzer also sounds.

345

8-2. Steps to take in an emergency

8

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hen

 troub

le 
arises

A buzzer sounds and a warning message is shown on the multi-infor-
mation display. The following warning indicates the possibility of dam-
age to the vehicle that may lead to an accident. Immediately stop the
vehicle in a safe place and contact your Scion dealer.

A buzzer sounds and a warning message is shown on the multi-infor-
mation display. Failure to investigate the cause of the following warn-
ings may lead to the system operating abnormally and possibly cause
an accident. Have the vehicle inspected by your Scion dealer.

Stop the vehicle immediately.

Warning message

Details

Indicates a malfunction in the EV system

A buzzer also sounds.

Have the vehicle inspected immediately.

Warning message

Details

Indicates a malfunction in the steering lock
system

A buzzer also sounds.

(Flashes)

346

8-2. Steps to take in an emergency

A buzzer sounds and a warning message is shown on the multi-infor-
mation display. After taking the specified steps to correct the sus-
pected problem, check that the warning message goes off.

Follow the correction procedures.

Warning message

Details

Correction procedure

Indicates that either
or both side the doors
are not fully closed

The system also indi-
cates which doors
are not fully closed.
If the vehicle
reaches a speed of
3 mph (5 km/h),

 flashes to

indicate that either
or both side doors
are not yet fully
closed.

Make sure that both
side doors are closed.

Indicates that the
back door is not fully
closed

If the vehicle
reaches a speed of
3 mph (5 km/h),

 flashes to

indicate that the
back door is not yet
fully closed.

Close the back door.

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8-2. Steps to take in an emergency

8

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hen

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arises

Indicates that the EV
system has over-
heated

This message may
be displayed when
driving under severe
operating conditions.
(For example, when
driving up a long
steep hill.)

A buzzer also
sounds.

Stop and check. 
(

P. 390)

The power output of
the EV system is
restricted

This message may
be displayed when
driving under severe
operating conditions.
(For example, when
driving up a long
steep hill.)

A buzzer also
sounds.

• Avoid sudden starting

or sudden accelera-
tion.

• Stop the vehicle and

wait until the mes-
sage disappears.

Regenerative braking
has been restricted

Braking force of the
regenerative brake
has reduced due to a
low traction battery
temperature.
A buzzer also
sounds.

Firmly depress the
brake pedal to deceler-
ate the vehicle.

Warning message

Details

Correction procedure

348

8-2. Steps to take in an emergency

Indicates that the
traction battery’s tem-
perature is low

The power output of
the traction battery
has been restricted.
The message may
appear the traction
battery’s remaining
charge has dis-
charged while driving.

A buzzer also
sounds.

Charge the traction bat-
tery. (

P. 181, 195)

Indicates that the
traction battery’s
remaining charge has
almost run out

A buzzer also sounds
3 times.

Charge the traction bat-
tery. (

P. 181, 195)

Indicates that the
traction battery has
completely run out
while driving

A buzzer also
sounds.

• Stop the vehicle in a

safe place.

• Charge the traction

battery. 
(

P. 181, 195)

Indicates that the
traction battery has
completely run out.

Charge the traction bat-
tery. (

P. 181, 195)

Warning message

Details

Correction procedure

(Flashes)

(Flashes)

(Flashes)

(Flashes)

349

8-2. Steps to take in an emergency

8

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hen

 troub

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arises

Indicates that the
recharge inlet door is
open during the EV
system operating or
while the shift lever is
in a position other
than P.

Close the recharge
inlet door.

Indicates that the
accelerator pedal is
depressed while the
shift lever is in P

A buzzer also
sounds.

• Release the acceler-

ator pedal.

• Check that the accel-

erator pedal is not
sticking.

Indicates that the
accelerator pedal is
depressed while the
shift lever is in N

A buzzer also
sounds.

Release the accelera-
tor pedal and shift the
shift lever to D or R.

Indicates that the
parking brake is still
engaged

If the vehicle reaches
a speed of 3 mph (5
km/h), and a buzzer
sounds to indicate
that the parking
brake is still
engaged.

Release the parking
brake.

Indicates that the
driver’s door was
opened with the shift
lever in a position
other than P

A buzzer also
sounds. 

• Shift the shift lever to

P.

• Close the driver’s

door.

Warning message

Details

Correction procedure

(Flashes)

(Flashes)

(Flashes)

(Flashes)