Page 517 of 624
5178-2. Steps to take in an emergency
PRIUS v_OM_OM47B23U_(U)
8
When trouble arises
*: For the EV drive mode operating conditions (P. 181).
Indicates that the EV drive mode has been auto-
matically canceled
*
The reason the EV drive mode is not available
(the battery charge is low, speed is higher than
the EV drive mode operating speed range,
accelerator pedal is depressed too much) may
be displayed.
A buzzer also sounds.
Drive the vehicle for a while.
(If equipped)
Since the vehicle speed is about 32 mph (50 km/h)
or less, is not available LDA
Traveling at the speed 32 mph (50 km/h) or
more
Displayed messageDetails/Actions
(Flashes
3 times)
Page 522 of 624
5228-2. Steps to take in an emergency
PRIUS v_OM_OM47B23U_(U)
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. 539), the
power switch was touched with
the electronic key.
Press the power switch
within 10 seconds of the
buzzer sounding.
Once
An attempt was made to start
the hybrid system with the shift
position in N.
Shift the shift position to P
and start the hybrid sys-
tem.
Once
The electronic key has a low
battery.
Replace the electronic key
battery. ( P. 464)
Once
Indicates a malfunction in the
smart key system
Have the vehicle inspected
by your Toyota dealer.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)
Page 537 of 624

537
PRIUS v_OM_OM47B23U_(U)
8
When trouble arises
8-2. Steps to take in an emergency
If the hybrid system will not star t
One of the following may be the cause of the problem:
●The electronic key may not be functioning properly.
* ( P. 539)
● There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ( P. 80)
● There may be a malfunction in the immobilizer system.
* ( P. 8 3 )
● There may be a malfunction in the shift control system.
*
( P. 179, 494, 508)
● The hybrid system may be malfunctioning due to an electrical prob-
lem such as electronic key battery depletion or a blown fuse. How-
ever, depending on the type of malfunction, an interim measure is
available to start the hybrid system. ( P. 538)
*: It may not be possible to shift the shift position other than P.
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( P. 541)
● The 12-volt battery terminal con nections may be loose or corroded.
( P. 442)
Reasons for the hybrid system not starting vary depending on
the situation. Check the follo wing and perform the appropriate
procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( P. 174)
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.
Page 538 of 624

5388-2. Steps to take in an emergency
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One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 541)
● One or both of the 12-volt batter y terminals may be disconnected.
( P. 442)
Contact your Toyota dealer if the problem cannot be repaired, or if
repair procedures are unknown.
When the hybrid system does not start, the following steps can be
used as an interim measure to st art the hybrid system if the power
switch is functioning normally.
Do not use this starting procedure except in cases of emergency.
Set the parking brake.
Shift the shift position to P.
Turn the power switch to ACCESSORY mode.
Press and hold the power switch for about 15 seconds while
depressing the brake pedal firmly.
Even if the hybrid system can be started using the above steps, the
system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer.
The interior lights and headlight s do not turn on, or the horn
does not sound.
Emergency start function
1
2
3
4
Page 539 of 624

539
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8
When trouble arises
8-2. Steps to take in an emergency
If the electronic key does not operate
properly
Use the mechanical key (P. 11 7 )
in order to perform the following
operations:
Locks all the doors
Unlocks the door
Turning the key rearward unlocks
the driver’s door. Turning the key
once again within 3 seconds
unlocks the other doors.
Ensure that the shift position 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.
Firmly depress the brake pedal and check that the smart key sys-
tem indicator light (green) turns on (vehicles without multi-informa-
tion display) or is shown on the multi-information display
(vehicles with multi-information display).
If communication between the electronic key and vehicle is
interrupted ( P. 133) or the electronic key cannot be used
because the battery is depleted, the smart key system and
wireless remote control cannot be used. In such cases, the
doors can be opened and the hybr id system can be started by
following the procedure below.
Locking and unlocking the doors
1
2
Starting the hybrid system
1
2
3
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5408-2. Steps to take in an emergency
PRIUS v_OM_OM47B23U_(U)
Press the power switch.
In the event that the hybrid system still cannot be operated, contact
your Toyota dealer.
■ Stopping the hybrid system
Set the parking brake, shift the shift position to P and press the power switch
as you normally do when stopping the hybrid system.
■ Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the
electronic key battery be replaced immediately when the battery is depleted.
( P. 464)
■ Changing power switch modes
Release the brake pedal and press the power switch in step above.
The hybrid system does not start and modes will be changed each time the
switch is pressed. ( P. 177)
■ When the electronic key does not work properly
●Make sure that the smart key system has not been deactivated in the cus-
tomization setting. If it is off, turn the function on.
(Customizable features: P. 577)
● Check if battery-saving mode is set. If it is set, cancel the function.
( P. 133)
4
3
Page 541 of 624
541
PRIUS v_OM_OM47B23U_(U)
8
When trouble arises
8-2. Steps to take in an emergency
If the 12-volt batter y is discharged
If you have a set of jumper (or booster) cables and a second vehicle
with a 12-volt battery, you can jump start your vehicle by following the
steps below.
Open the hood ( P. 424) and
fuse box cover.
When closing, first hook the lid
onto the two rear tabs.
Open the exclusive jump start-
ing terminal cover.
The following procedures may be used to start the hybrid sys-
tem if the vehicle’s 12-volt battery is discharged.
You can also call your Toyota de aler or a qualified repair shop.
1
2
Page 542 of 624
5428-2. Steps to take in an emergency
PRIUS v_OM_OM47B23U_(U)
Connect the jumper cables according to the following procedure:Connect a positive jumper cabl e clamp to the exclusive jump
starting terminal on your vehicle.
Connect the clamp on the other e nd of the positive cable to the
positive (+) battery terminal on the second vehicle.
Connect a negative cable clamp to the negative (-) battery termi-
nal on the second vehicle.
Connect the clamp at the other end of the negative cable to a
solid, stationary, unpainted metallic point away from the exclusive
jump starting terminal and any moving parts, as shown in the
illustration.
Start the engine of the second vehicle. Increase the engine speed
slightly and maintain at that le vel for approximately 5 minutes to
recharge the 12-volt battery of your vehicle.
Maintain the engine speed of t he second vehicle and start the
hybrid system of your vehicle by turning the power switch to ON
mode.3
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2
3
4
4
5