warning light TOYOTA PRIUS PRIME 2023 Owners Manual

5568-2. Steps to take in an emergency
■High coolant temperature warning light (warning buzzer)
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the multi-information display with a message.
■Hybrid system overheat warning light* (warning buzzer)
*: This light illuminates on the multi- information display with a message.
■Malfunction indicator lamp
Warning lightDetails/Actions
Indicates that the engine is overheating
Immediately stop the vehicle in a safe
place.
Handling method ( P.594)
Warning lightDetails/Actions
Indicates that the engine oil pressure is too low
 Immediately stop the vehicle in a safe
place and contact your Toyota dealer.
( P.506)
Warning lightDetails/Actions
Indicates that the hybrid system has overheated
 Stop the vehicle in a safe place. Handling
method ( P.595)
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The hybrid system;
 The electronic engine control system;
 The electronic throttle control system; or
 The emission control system (if equipped)
 Have the vehicle inspected by your Toyota
dealer immediately.

5578-2. Steps to take in an emergency
8
When trouble arises
■SRS warning light (warning buzzer)
This warning light indicates problems with the following:
 Airbag sensor assembly
 Front impact sensors
 Side impact sensors (front door)
 Side impact sensors (front)
 Front passenger occupant classification sensors
 Front passenger’s seat belt buckle switch
 SRS warning light
 “PASSENGER BAG ON” indicator light
 “PASSENGER BAG OFF” indicator light
 SRS airbags
 SRS system related wiring harnesses and power sources
■ABS warning light (warning buzzer)
Warning lightDetails/Actions
Indicates a malfunction in:
The SRS airbag system; or
 The seat belt pretensioner system
 Have the vehicle inspected by your Toyota
dealer immediately.
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The ABS; or
 The brake assist system
 Have the vehicle inspected by your Toyota
dealer immediately.

5588-2. Steps to take in an emergency
■Electric power steering system warning light (warning
buzzer)
■PCS warning light (warning buzzer)
■LTA indicator (warning buzzer)
■LDA indicator (warning buzzer)
Warning lightDetails/Actions
(Red)
(Yellow)
Indicates a malfunction in the EPS (Electric
Power Steering) system
 Have the vehicle inspected by your Toyota
dealer immediately.
Warning lightDetails/Actions
Indicates a malfunction in the PCS (Pre-Colli-
sion System).
Follow the instructions displayed on the
multi-information display.
If the PCS (Pre-Collision System) or VSC (Vehi-
cle Stability Control) system is disabled, the
PCS warning light will illuminate.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the LTA (Lane Trac-
ing Assist)
 Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the LDA (Lane Depar-
ture Alert)
Follow the instructions displayed on the
multi-information display.

5598-2. Steps to take in an emergency
8
When trouble arises
■PDA indicator (warning buzzer)
■Cruise control indicator (warning buzzer)
■Dynamic radar cruise control indicator (warning buzzer)
■Driving assist information indicator
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the PDA (Proactive
Driving Assist).
Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the cruise control sys-
tem.
Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the dynamic radar
cruise control system.
Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
Indicates one of the following systems is mal-
functioning.
PCS (Pre-Collision System)
 LDA (Lane Departure Alert)
 Follow the instructions displayed on the
multi-information display.
Indicates one of the following systems is mal-
functioning or disabled.
 PKSB (Parking Support Br ake) (if equipped)
 RCD (Rear Camera Detection) (if equipped)
 BSM (Blind Spot Monitor) (if equipped)
 RCTA (Rear cross traffic alert) (if equipped)
 Safe Exit Assist (if equipped)
 Follow the instructions displayed on the
multi-information display.

5608-2. Steps to take in an emergency
■Intuitive parking assist OFF indicator (warning buzzer)
■Slip indicator light
■Inappropriate pedal operation warning light* (warning buzzer)
*: This light illuminates on the multi-information display with a message.
Warning lightDetails/Actions
When a buzzer sounds:
Indicates a malfunction in the Intuitive parking
assist function
Have the vehicle inspected by your Toyota
dealer immediately.
When a buzzer does not sound:
Indicates that the system is temporarily unavail-
able, possibly due to a sensor being dirty or cov-
ered with ice, etc.
 Follow the instructions displayed on the
multi-information display. ( P.365, 566)
Warning lightDetails/Actions
Indicates a malfunction in:
The VSC system;
 The TRAC system; or
 The hill-start assist control system
 Have the vehicle inspected by your Toyota
dealer immediately.
Warning lightDetails/Actions
When a buzzer sounds:
Brake Override System is malfunctioning
 Drive-Start Control is malfunctioning
 Drive-Start Control is operating
 Follow the instructions displayed on the
multi-information display.
When a buzzer does not sound:
Brake Override System is operating.
 Release the accelerator pedal and
depress the brake pedal.

5618-2. Steps to take in an emergency
8
When trouble arises
■Brake hold operated indicator (warning buzzer)
■Parking brake indicator (warning buzzer)
■Tire pressure warning light (warning buzzer)
Warning lightDetails/Actions
(Flashes)
Indicates a malfunction in the brake hold system
 Have the vehicle inspected by your Toyota
dealer immediately.
Warning lightDetails/Actions
(U.S.A.)
(Flashes)
(Canada)
(Flashes)
It is possible that the parking brake is not fully
engaged or released
 Operate the parking brake switch once
again.
This light comes on when the parking brake is
not released. If the light turns off after the park-
ing brake is fully released, the system is operat-
ing normally.
Warning lightDetails/Actions
When the light comes on after blinking for
approximately 1 minute (a buzzer does not
sounds):
Malfunction in the tire pressure warning system
 Have the system checked by your Toyota
dealer.
When the light comes on (a buzzer sounds):
 Low tire inflation pressure from natural causes
 After the temperature of the tires has low-
ered sufficiently, check the inflation pres-
sure of each tire and adjust them to the
specified level.
 Low tire inflation pressure from flat tire
 Immediately stop the vehicle in a safe
place and perform the necessary actions.

5628-2. Steps to take in an emergency
■Low fuel level warning light
■Driver’s and front passenger’s seat belt reminder light (warn-
ing buzzer*)
*: Driver’s seat belt warning buzzer:The driver’s seat belt warning buzzer sounds to alert the driver that his or
her seat belt is not fastened. Once th e power switch is turned to ON, the
buzzer sounds. If the seat belt is still unfastened, the buzzer sounds inter-
mittently for a certain period of time after the vehicle reaches a certain
speed.
Front passenger’s seat belt warning buzzer:
The front passenger’s seat belt warning buzzer sounds to alert the front
passenger that his or her seat belt is not fastened. If the seat belt is
unfastened, the buzzer sounds intermit tently for a certain period of time
after the vehicle reaches a certain speed.
■Rear passengers’ seat belt reminder light*1 (warning
buzzer*2)
*1: Regardless of whether or not a rear passenger is present, this light will
also illuminate for a certain period of time after the rear door is opened
and closed.
*2: Rear passengers’ seat belt warning buzzer: The rear passengers’ seat belt warning buzzer sounds to alert the rear
Warning lightDetails/Actions
Indicates that remaining fuel is approximately
1.7 gal. (6.0 L, 1.4 Imp. gal.) or less
 Refuel the vehicle.
Warning lightDetails/Actions
Warns the driver and/or front passenger to fas-
ten their seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied,
the front passenger’s seat belt also needs
to be fastened to m ake the warning light
(warning buzzer) turn off.
Warning lightDetails/Actions
Warns the rear passengers to fasten their seat
belts
 Fasten the seat belt.

5638-2. Steps to take in an emergency
8
When trouble arises
passenger that his or her seat belt is not fastened. If the seat belt is
unfastened, the buzzer sounds intermitte ntly for a certain period of time,
after the seat belt is fastened and unfastened and the vehicle reaches a
certain speed.
■Warning buzzer
In some cases, the buzzer may not
be heard because of noisy place or
an audio sound.
■Front passenger detection sen-
sor, seat belt reminder and
warning buzzer
●If luggage is placed on the front
passenger seat, the front passen-
ger detection sensor may cause
the warning light to flash and the
warning buzzer to sound even if a
passenger is not sitting in the
seat.
●If a cushion is placed on the seat,
the sensor may not detect a pas-
senger, and the warning light may
not operate properly.
■If the malfunction indicator
lamp comes on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fu el tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after several
driving trips.
If the light does not go off even after
several trips, contact your Toyota
dealer as soon as possible.
■Electric power steering system
warning light (warning buzzer)
When the 12-volt battery charge
becomes insufficient or the voltage
temporarily drops, the electric power
steering system warning light may
come on and the warning buzzer
may sound.
At this time, the functions of the air
conditioning, etc. may be partially
limited in order to reduce the power consumption of the 12-volt battery.
■When the tire pressure warning
light comes on
Inspect the tires to check if a tire is
punctured.
If a tire is punctured: P.574
If none of the tires are punctured:
Turn the power switch off then turn it
to ON.
Check if the tire pressure warning
light comes on or blinks.
If the tire pressure warning light
blinks for approximately 1 minute
then stays on
There may be a malfunction in the
tire pressure wa rning system. Have
the vehicle inspected by your
Toyota dealer immediately.
If the tire pressure warning light
comes on
After the temperature of the tires
has lowered sufficiently, check the
inflation pressure of each tire and
adjust them to th e specified level.
If the warning light does not turn off
even after several minutes have
elapsed, check that the inflation
pressure of each tire is at the speci-
fied level and perform the tire infla-
tion pressure setting procedure.
(  P.524)
If the warning light does not turn off
even after several minutes have
elapsed since performing the tire
inflation pressure setting proce-
dure, have the vehicle inspected by
your Toyota dealer as soon as pos-
sible.

5648-2. 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 tem-
perature. In this case, adjusting the
tire inflation pressure will turn off the
warning light (after a few minutes).
■Conditions that the tire pres-
sure warning system may not
function properly
 P.517
WARNING
■If a warning light comes on or
a warning buzzer sounds
when a warning message is
shown on the multi-informa-
tion display
*
Check and follow the message
shown on the multi-information
display.
Failure to do so may result in
death or serious injury.
*: Warning lights illuminate in red
or yellow and the warning
buzzer beeps once or sounds
continuously.
■When the electric power
steering system warning light
comes on
When the light comes on yellow,
the assist to the power steering is
restricted. When the light comes
on red, the assist to the power
steering is lost and handling oper-
ations of the steering wheel
become extremely heavy.
If the steering wheel becomes
heavier than usual when operat-
ing, 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 con-
trol 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 infla-
tion pressure 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 dete-
riorate, 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.
■Maintenance of the tires
Each tire, includ ing the spare (if
provided), should be checked
monthly when cold and inflated to
the inflation pressure recom-
mended by the vehicle manufac-
turer on the vehicle placard or tire
inflation pressure label (tire and
load information label). (If your
vehicle has tires of a different size
than the size indicated on the
vehicle placard or tire inflation
pressure label [tire and load infor-
mation label], you should deter-
mine the proper tire inflation
pressure for those tires.)

5658-2. Steps to take in an emergency
8
When trouble arises
WARNING
As an added safety feature, your
vehicle has been equipped with a
tire pressure monitoring system
(TPMS-tire pressure warning sys-
tem) 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 pres-
sure warning light) illuminates,
you should stop and check your
tires as soon as possible, and
inflate them to the proper pres-
sure. Driving on a significantly
under-inflated tire causes the tire
to overheat and can lead to tire
failure. Under-inflation also
reduces fuel efficiency and tire
tread life, and may affect the vehi-
cle’s handling and stopping abil-
ity.
Please note that the TPMS (tire
pressure warning system) is not a
substitute for proper tire mainte-
nance, and it is the driver’s
responsibility to maintain correct
tire pressure, even if under-infla-
tion has not reached the level to
trigger illumination of the TPMS
low tire pressure telltale (tire pres-
sure warning light).
Your vehicle has also been
equipped with a TPMS (tire pres-
sure warning system) malfunc-
tion indicator to indicate when the
system is not operating properly.
The TPMS (tire pressure warning
system) malfunction indicator is
combined with the low tire pres-
sure 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 con-
tinue upon subsequent vehicle
start-ups as long as the malfunc-
tion exists. When the malfunction
indicator is illumi nated, the sys-
tem may not be able to detect or
signal low tire pressure as
intended.
TPMS (tire pressure warning sys-
tem) malfunctions may occur for a
variety 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 pressure
warning system) malfunction tell-
tale after replacing one or more
tires or wheels on your vehicle to
ensure that the replacement or
alternate tires and wheels allow
the TPMS (tire pressure warning
system) to continue to function
properly.
NOTICE
■To ensure the tire pressure
warning system operates
properly
Do not install tires with different
specifications or manufacturers
as the tire pressure warning sys-
tem may not operate properly.