Page 330 of 496
3306-3. Do-it-yourself maintenance
PRIUS +_OM_OM47888E_(EE)
WARNING
■ When replacing the 12-volt battery
Use a 12-volt battery designed for this vehicle. Failure to do so may cause
gas (hydrogen) to enter the passenger compartment, causing a fire or
explosion.
For replacement of the 12-volt battery, contact any authorized Toyota dealer
or repairer, or another duly qualified and equipped professional.
■ When disconnecting the 12-volt battery
NOTICE
■When recharging the 12-volt battery
Never recharge the 12-volt battery while the hybrid system is operating.
Also, be sure all accessories are turned off.
Do not disconnect the negative (-) termi-
nal on the body side as shown. The dis-
connected negative (-) terminal may
touch the positive (+) terminal, which
may cause a short and result in death or
serious injury.
Page 351 of 496
3516-3. Do-it-yourself maintenance
PRIUS +_OM_OM47888E_(EE)
6
Maintenance and care
Electronic key batter y
●Flathead screwdriver
● Lithium battery CR1632
Take out the mechanical key.
Remove the cover.
To prevent damage to the key,
cover the tip of the screwdriver with
a rag.
Remove the depleted battery.
Insert a new battery with the “+”
terminal facing up.
When installing, reverse the steps listed.
Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery
1
2
ITO43P194
3
4
Page 352 of 496

3526-3. Do-it-yourself maintenance
PRIUS +_OM_OM47888E_(EE)
■Use a CR1632 lithium battery
●Batteries can be purchased at any authorized Toyota dealer or repairer, or
another duly qualified and equipped professional, local electrical appliance
shops or camera stores.
● Replace only with the same or equivalent type recommended by the manu-
facturer.
● Dispose of used batteries according to the local laws.
■ If the electronic key battery is depleted
The following symptoms may occur:
●The smart entry & start system and wireless remote control will not function
properly.
● The operational range will be reduced.
WARNING
■ Removed battery and other parts
These parts are small and if swallowed by a child, they can cause choking.
Keep away from children. Failure to do so could result in death or serious
injury.
■ Certification for the smart entry & start system
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT
TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
NOTICE
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents:
●Always work with dry hands.
Moisture may cause the battery to rust.
● Do not touch or move any other component inside the remote control.
● Do not bend either of the battery terminals.
Page 367 of 496

367
7When trouble arises
PRIUS +_OM_OM47888E_(EE)7-1. Essential information
Emergency flashers ........... 368
If your vehicle has to be stopped in an
emergency ....................... 369
7-2. Steps to take in an emergency
If your vehicle needs to be towed ...................... 370
If you think something is wrong ............................... 375
If a warning light turns on or a warning buzzer
sounds ............................. 376
If a warning message is displayed ......................... 388
If you have a flat tire (vehicles with a
spare tire) ........................ 404
If you have a flat tire (vehicles without a
spare tire) ........................ 418
If the hybrid system will not start............................ 435
If the electronic key does not operate properly ........ 437
If the 12-volt battery is discharged ....................... 439
If your vehicle overheats ......................... 444
If the vehicle becomes stuck ................................ 449
Page 370 of 496

3707-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
If your vehicle needs to be towed
In the following situations, it is not possible to be towed by another
vehicle using cables or chains, as the front wheels may be locked due
to the parking lock. Contact any authorized Toyota dealer or repairer,
or another duly qualified and equipped professional or commercial
towing service.
●There is a malfunction in the shift control system. ( →P. 378, 390)
● There is a malfunction in the immobilizer system. ( →P. 9 1 )
● There is a malfunction in the smart entry & start system. ( →P. 437)
● The 12-volt battery is discharged. ( →P. 439)
The following may indicate a problem with your hybrid transmission.
Contact any authorized Toyota dealer or repairer, or another duly
qualified and equipped professional or commercial towing service
before towing.
● The hybrid system warning light turns on or the hybrid system
warning message is displayed on the multi-information display and
the vehicle does not move.
● The vehicle makes an abnormal sound.
If towing is necessary, we recommend having your vehicle
towed by any authorized Toyota dealer or repairer, or another
duly qualified and equipped professional or commercial towing
service, using a lift-type truck or flat bed truck.
Use a safety chain system for all towing, and abide by all state/
provincial and local laws.
Situations when it is not possible to be towed by another vehicle
Situations when it is necessary to contact dealers before towing
Page 379 of 496

3797-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
7
When trouble arises
(If equipped)
Parking lock system warning message (warning buzzer)Indicates a malfunction in the shift control system when
the vehicle is stopped
• In this situation, there is a possibility that the parkinglock mechanism will not work. When parking, park the
vehicle on a flat surface and apply the parking brake
securely.
• The power switch may not be turned off. If this happens,
applying the parking brake will enable the switch to be
turned off.
→ Have the vehicle inspected by any authorized Toyota
dealer or repairer, or another duly qualified and
equipped professional immediately.
(If equipped)
Hybrid battery indicator light The hybrid battery (traction battery) will soon need to be
inspected or replaced
Have the hybrid battery (traction battery) inspected by any
authorized Toyota dealer or re pairer, or another duly quali-
fied and equipped professional immediately.
*2
→ Have the vehicle inspected by any authorized Toyota
dealer or repairer, or another duly qualified and
equipped professional immediately.
(If equipped)
LED headlight warning light Indicates a malfunction in the LED headlights
The LED headlights will not normally illuminate when
there is a malfunction, however they may be able to illu-
minate depending on the nature of the problem.
→ Have the vehicle inspected by any authorized Toyota
dealer or repairer, or another duly qualified and
equipped professional immediately.
(Flashes)
(If equipped)
P position request indicator light (warning buzzer)
The amount of charge remaining in the hybrid battery
(traction battery) has fallen because the shift position has
been left in N for a long time
→ Because recharging is not possible when the shift
position is in N, shift the shift position to P when
parking the vehicle for a long time.
• The driver’s door has been opened while the shift posi- tion is in N, D or B
• An attempt has been made to start the hybrid system
while the shift position is in anything other than P
→ Shift the shift position to P.
Warning lightWarning light/Details/Actions
Page 380 of 496

3807-2. Steps to take in an emergency
PRIUS +_OM_OM47888E_(EE)
(If equipped)
Hybrid system overheat warning light (warning buzzer)The hybrid system has overheated
This light may come on when driving under severe operat-
ing conditions, and the output of the hybrid system may
temporarily decrease in order to protect the system. (For
example, when driving up a long steep hill or driving up a
steep hill in reverse.)
→ Stop and check. ( →P. 444)
(If equipped)
Cruise control indicator (yellow indicator)
Indicates a malfunction in the cruise control
→ Have the vehicle inspected by any authorized Toyota
dealer or repairer, or another duly qualified and
equipped professional immediately.
(Only outer frame flashes)
(If equipped)
Low hybrid battery (traction battery) warning light
(warning buzzer)
Hybrid battery (traction battery) level becomes low
because the shift position is in N for long time
→ Because recharging is not possible when the shift
position is in N, shift the shift position to P when
parking the vehicle for a long time.
High coolant temperature warning light
Changes from a flashing to a solid light when the engine
coolant temperature increases
→ Stop and check. ( →P. 444)
Automatic headlight leveling system warning light
Indicates a malfunction in the automatic headlight leveling
system
→ Have the vehicle inspected by any authorized Toyota
dealer or repairer, or another duly qualified and
equipped professional immediately.
Open door warning light (warning buzzer)*3
Indicates that a door is not fully closed
→ Check that all the doors are closed.
Low fuel level warning light
Indicates that remaining fuel is approximately 6.0 L (1.6
gal., 1.3 Imp.gal.) or less
→ Refuel the vehicle.
Warning lightWarning light/Details/Actions
Page 382 of 496

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.