2020 TOYOTA PRIUS C key

4998-2. Steps to take in an emergency
8
When trouble arises
PRIUS c_U
Carrying out the corresponding action turns the message off.
After taking the specified steps to correct the suspected probl em,
check that the warning m essage and light go off.
Other displayed message
Displayed messageDetails/Actions
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.
 If the air intake vent is dirty, refer to P. 404
for cleaning the air intake vent.
 If the message is being displayed and the air
intake vent is not dirty, have the vehicle
inspected at your Toyota dealer.
Have the malfunction repaired immediately. (vehicles with a
smart key system)
Interior
buzzerExterior buzzerWarning messageDetails/Actions
Once  The electronic key is not
detected when an attempt is
made to start the hybrid sys-
tem.

Start the hybrid system
with the electronic key
present.
(Flashes)

5008-2. Steps to take in an emergency
PRIUS c_U
Once3 times
The electronic key was carried
outside the vehicle and the
driver’s door was opened and
closed while the shift lever was
in P without turning off the
power switch.
Turn the power switch off
or bring the electronic key
back into the vehicle.
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.
Once
Contin-
uous
(For 5 sec-
onds)
An attempt was made to lock
the doors using the entry func-
tion after the electronic key was
carried outside the vehicle with-
out turning off the power switch.
 Turn the power switch off
and lock the doors again.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)
(Displayed alternately)
(Flashes)

5018-2. Steps to take in an emergency
8
When trouble arises
PRIUS c_U
9 times
An attempt was made to start
the hybrid system without the
electronic key being present, or
the electronic key was not func-
tioning normally.
An attempt was made to drive
when the regular key was not
inside the vehicle.
Confirm that the elec-
tronic key is inside the
vehicle.
Contin-
uous
The driver’s door was opened
while a shift lever position other
than P was selected without
turning off the power switch.
 Shift the shift lever to P.
Contin-
uousContin-uous
The electronic key was carried
outside the vehicle and the
driver’s door was opened and
closed while a shift lever posi-
tion other than P was selected
without turning off the power
switch.
 Shift the shift lever to P.
 Bring the electronic key
back into the vehicle.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Displayed alternately)
(Flashes)

5028-2. Steps to take in an emergency
PRIUS c_U

Contin-uous
(5 sec-
onds)
An attempt was made to lock
the doors using the smart key
system while the electronic key
was still inside the vehicle.
 Retrieve the electronic key
from the vehicle and lock
the doors again.
Once
Contin-
uous
(5 sec- onds)
An attempt was made to lock
either front door by opening a
door and putting the inside door
lock button into the lock posi-
tion, and then closing the door
while 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
• The electronic key could not
be detected when the power
switch was pressed after the
doors were unlocked with the
mechanical key.
• The electronic key could not
be detected two consecutive
times when the power switch
was pressed.
 Touch the electronic key to
the power switch while
depressing the brake
pedal.
Once
An attempt was made to start
the hybrid system with the shift
lever in a position other than P.
Shift the shift lever to P
and start the hybrid sys-
tem.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)
(Flashes)

5038-2. Steps to take in an emergency
8
When trouble arises
PRIUS c_U

Power was turned off due to the
automatic power off function.
Next time when starting
the hybrid system,
increase the engine speed
slightly and maintain that
level for approximately 5
minutes to recharge the
12-volt-battery.
Once
The electronic key has a low
battery.
Replace the electronic key
battery. ( P. 451)
Once
The driver’s door was opened
and closed with the power
switch turned off and then the
power switch was put in
ACCESSORY mode twice with-
out the hybrid system being
started.
Press the power switch
while depressing the brake
pedal.
During a hybrid system starting
procedure in the event that the
electronic key was not function-
ing properly ( P. 520), the
power switch was touched with
the electronic key.
 Press the power switch
within 10 seconds of the
buzzer sounding.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)

5188-2. Steps to take in an emergency
PRIUS c_U
One of the following may be the cause of the problem:
● Vehicles with a smart key system: The electronic key may not be
functioning properly. ( P. 520)
● There may not be sufficient f uel in the vehicle’s tank.
Refuel the vehicle. ( P. 221)
● Vehicles with immobilizer syste m: There may be a malfunction in
the immobilizer system. ( P. 8 8 )
● There may be a malfunction i n the steering lock system.
● Vehicles with a smart key system : The hybrid system may be mal-
functioning due to an electrical problem such as an open circui t or a
blown fuse. However, depending on the type of malfunction, an
interim measure is available to start the hybrid system. (P. 519)
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( P. 522)
● The 12-volt battery terminal conn ections may be loose or corroded.
(  P. 431)
If the hybrid system will not start
Reasons for the hybrid system not starting vary depending on
the situation. Check the followi ng and perform the appropriate
procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( P. 188, 192)
The interior lights and headlights are dim, or the horn does no t
sound or sounds at a low volume.

5198-2. Steps to take in an emergency
8
When trouble arises
PRIUS c_U
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( P. 522)
● One or both of the 12-volt battery terminals may be disconnecte d.
(  P. 431)
Contact your Toyota dealer if the problem cannot be repaired, o r if repair
procedures are unknown.
When the hybrid system does not start, the following steps can be
used as an interim measure to sta rt the hybrid system if the power
switch is functioning normally.
Do not use this starting procedure except in case of emergency.
Set the parking brake.
Shift the shift lever to P.
Turn the power switch to ACCESSORY mode.
Press and hold the power swi tch for about 15 seconds.
Even if the hybrid system can be started using the above steps, the
system may be malfunctioning. Hav e the vehicle inspected by your
Toyota dealer.
The interior lights and headlights do not turn on, or the horn
does not sound.
Emergency start function (vehicles with a smart key system)
1
2
3
4

5208-2. Steps to take in an emergency
PRIUS c_U
Use the mechanical key (P.
121) in order to perform the fol-
lowing operations (driver’s door
only):
Unlocks the doors
Locks all the doors
Turning the key rearward unlocks
the driver’s door. Turning the key
once again within 5 seconds
unlocks the other doors.
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Toyota emblem side
of the electronic key to the
power switch.
When the electronic key is
detected, a buzzer sounds and the
power switch will turn to ON mode.
When the smart key system is
deactivated in customization set-
ting, the power switch will turn to
ACCESSORY mode.
If the electronic key does not operate prop-
erly (vehicles with a smar t key system)
If communication between the electronic key and vehicle is
interrupted ( P. 143) or the electronic key cannot be used
because the battery is depleted, the smart key system and wire-
less remote control cannot be used. In such cases, the doors
can be opened and the hybrid system can be started by follow-
ing the procedure below.
Locking and unlocking the doors
1
2
Starting the hybrid system
1
2