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3827-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
*1: 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
5 km/h (3 mph) or more.
*2: If you continue to use the vehicle in this state, the light starts blinking withbuzzer sounds, and you will soon become unable to start the hybrid sys-
tem.
*3: Open door warning buzzer:
The open door warning buzzer sounds to alert one or more of the doors is
not fully closed (with the vehicle having reached a speed of 5 km/h
[3 mph]).
*4: Seat belt buzzer:The seat belt buzzer sounds to alert the driver, front passenger and rear
passengers that his or her seat belt is not fastened. The buzzer sounds for
30 seconds after the vehicle reaches a speed of 20 km/h (12 mph). Then, if
the seat belt is still unfastened, the buzzer will sound in a different tone for
90 more seconds.
Carrying out the corresponding action turns the warning light off.
Other warning light
Warning lightWarning light/Details/Actions
(If equipped)
Go to service warning light Indicates that maintenance of the hybrid battery (traction
battery) cooling component is required
The filter may be clogged, the air intake vent may be
blocked or there may be a gap in the duct.
→ Have maintenance performed on the hybrid battery
(traction battery) cooling component at any autho-
rized Toyota dealer or repairer, or another duly quali-
fied and equipped professional.
Page 386 of 496

3867-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
After taking the specified steps to correct the suspected problem,
check that the warning light turn off.
Follow the correction procedures. (vehicles without multi-infor-
mation display)
InteriorbuzzerExterior buzzerWarning lightDetailsCorrection procedure
Once
The electronic key
is not detected
when an attempt
is made to start
the hybrid system.
Start the hybrid system
with the electronic key
present.
The power switch
has been pressed
while the elec-
tronic key was not
detected inside
the vehicle.
Confirm the location of
the electronic key.
(→ P. 151)
If the warning light does
not extinguish even
though the electronic
key is within operating
range, touch the elec-
tronic key to the power
switch while depressing
the brake pedal
(→ P. 437)
Transmission
between the elec-
tronic key and the
vehicle is being
blocked, or the bat-
tery in the electronic
key has been
depleted.
Once
Driving has been
started without
the correct elec-
tronic key inside
the vehicle.
Confirm the location of
the electronic key.
Page 387 of 496

3877-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
7
When trouble arises
Once3 times
The electronic key
was carried out-
side the vehicle
and a door other
than the driver’s
door was opened
and closed while
the power switch
was in a mode
other than off.
Bring the electronic key
back into the vehicle.
The electronic key
was carried out-
side the vehicle
and the driver’s
door was opened
and closed while
the shift position
P was selected
without turning off
the power switch.
Turn the power switch
off or bring the elec-
tronic key back into the
vehicle.
Contin-uous
An attempt was
made to exit the
vehicle with the
electronic key and
lock the doors
without first turn-
ing the power
switch off.
Turn the power switch
off and lock the doors
again.
Contin-uousContin- uous
The electronic key
was carried out-
side the vehicle
and the driver’s
door was opened
and closed while
any shift position
other than P was
selected without
turning off the
power switch.
• Shift the shift position to P.
• Bring the electronic key back into the
vehicle.
InteriorbuzzerExterior buzzerWarning lightDetailsCorrection procedure
Page 390 of 496

3907-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
Indicates a malfunction in the shift control systemIn this situation, there is a possibility that the
parking lock mechanism will not work. When
parking, park the vehicle on a flat surface and
apply the parking brake securely. Also, it may
not be possible to turn the power switch off. If
this happens, applying the parking brake will
enable the switch to be turned off. A buzzer
also sounds.
→ Have the vehicle inspected by any autho-
rized Toyota dealer or repairer, or another
duly qualified and equipped professional.
Indicates a malfunction in the hybrid system
A buzzer also sounds.
→ Immediately stop the vehicle in a safe place
and contact any authorized Toyota dealer
or repairer, or another duly qualified and
equipped professional.
Indicates that the hybrid battery (traction battery)
is low
A buzzer also sounds.
→ When stopping the vehicle for a long
period of time, shift the shift position to P.
The battery cannot be charged with the
shift position in N.
(If equipped)
Indicates that the radar cruise control sensor is
dirty or covered with ice
A buzzer also sounds.
→ Clean the sensor.
(If equipped)
Indicates that the dynamic radar cruise control
system is unable to judge vehicle-to-vehicle dis-
tance
A buzzer also sounds.
→ If the windshield wipers are on, turn them
off or set them to either intermittent or slow
mode.
Warning messageDetails/Actions
(Flashes)
Page 395 of 496

3957-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
7
When trouble arises
Insufficient 12-volt battery charge A buzzer also sounds.
→ Recharge or replace the 12-volt battery.
• The hybrid system may not be able to start.
• The parking lock mechanism may not func- tion. When parking, choose a level location
and apply the parking brake securely.
• The power switch may not be able to be
turned off. In this case, the power switch
may be turned off by applying the parking
brake.
• After charging the 12-volt battery, the mes- sage may continue to be displayed until the
shift position is changed from P.
Shift control system malfunction A buzzer also sounds.
→ Have the vehicle inspected by any autho-
rized Toyota dealer or repairer, or another
duly qualified and equipped professional.
• The hybrid system may not be able to start.
• The parking lock mechanism may not func- tion. When parking, choose a level location
and apply the parking brake securely.
• The power switch may not be able to be
turned off. In this case, the power switch
may be turned off by applying the parking
brake.
Shift control system malfunction A buzzer also sounds.
→ Have the vehicle inspected by any autho-
rized Toyota dealer or repairer, or another
duly qualified and equipped professional
immediately. If not inspected, vehicle sys-
tems may stop operating normally.
Warning messageDetails/Actions
Page 397 of 496
3977-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
7
When trouble arises
Carrying out the corresponding action turns the messages off.
Other displayed messages
Displayed messageDetails/Actions
Maintenance of the hybrid battery (traction bat-
tery) cooling component is requiredThe filter may be clogged, the air intake vent
may be blocked or there may be a gap in the
duct.
→ Have maintenance performed on the hybrid
battery (traction battery) cooling compo-
nent at any authorized Toyota dealer or
repairer, or another duly qualified and
equipped professional.
Indicates that the EV drive mode is not available*
The reason the EV drive mode is not available
(the vehicle is idling, battery charge is low,
speed is higher than the EV drive mode operat-
ing speed range, accelerator pedal is
depressed too much) may be displayed.
A buzzer also sounds.
→ Use the EV drive mode when it becomes
available.
Page 401 of 496

4017-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
7
When trouble arises
Once3 times
The electronic key was carried
outside the vehicle and a door
other than the driver’s door was
opened and closed while the
power switch was in a mode
other than off.
→Bring the electronic key
back into the vehicle.
The electronic key was carried
outside the vehicle and the
driver’s door was opened and
closed while the shift position P
was selected without turning off
the power switch.
→Turn the power switch off.
→ Bring the electronic key
back into the vehicle.
Once
Sounds
once for 5
seconds
An attempt was made to exit
the vehicle with the electronic
key and lock the doors without
first turning the power switch
off.
→Turn the power switch off
and lock the doors again.
Once
An attempt was made to turn
the power switch off when the
shift position was not in P.
→To turn off the hybrid sys-
tem, first shift the shift
position to P and then turn
the power switch off.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)
(Displayed alternately)
(Flashes)
(Flashes)
Page 402 of 496
4027-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
Once
Sounds
once for 5
seconds
• An attempt was made to lockthe doors using the smart
entry & start system while the
electronic key was still inside
the vehicle.
• An attempt was made to lock either front door by opening a
door and putting the inside
lock button into the lock posi-
tion, then closing the door by
pulling on the outside door
handle with the electronic key
still inside the vehicle.
→ Retrieve the electronic key
from the vehicle and lock
the doors again.
Once
• When the doors were
unlocked with the mechanical
key and then the power
switch was pressed, the elec-
tronic key could not be
detected in the vehicle.
• The electronic key could not
be detected in the vehicle
even after the power switch
was pressed two consecu-
tive times.
→ Touch the electronic key to
the power switch while
depressing the brake
pedal.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)