2014 TOYOTA PRIUS PLUG-IN HYBRID 12 volt battery

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4-3. Do-it-yourself maintenance
PRIUS PHV_OM_OM47856U_(U)
Engine compar tment
■12-volt battery
P. 474
Engine coolant reservoir
( P. 467)
Engine oil level dipstick ( P. 463)
Engine oil filler cap ( P. 464)
Power control unit coolant
reservoir ( P. 467)Brake fluid reservoir
( P. 470)
Fuse box ( P. 498)
Radiator ( P. 469)
Condenser ( P. 469)
Electric cooling fans
Washer fluid tank ( P. 472)

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4-3. Do-it-yourself maintenance
PRIUS PHV_OM_OM47856U_(U)
12-volt batter y
■Location
The 12-volt battery is located
in the right-hand side of lug-
gage compartment.
■ Removing the 12-volt battery cover
Open the center deck board. ( P. 405)
Remove the side deck board.
Remove the auxiliary box.
STEP 1
STEP 2
STEP 3

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4-3. Do-it-yourself maintenance
PRIUS PHV_OM_OM47856U_(U)
4
Maintenance and care
■
Before charging
When charging, the 12-volt battery produces hydrogen gas which is flamma-
ble and explosive. Therefore, observ e the following precautions before
charging:
● If charging with the 12-volt battery installed on the vehicle, be sure to dis-
connect the ground cable.
● Make sure the power switch on the charger is off when connecting and
disconnecting the charger cables to the 12-volt battery.
Remove the 12-volt battery
maintenance cover.
■ Exterior
Make sure that the 12-volt battery terminals are not corroded
and that there are no loose c onnections, cracks, or loose
clamps.
Terminals
Hold-down clampSTEP 4

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PRIUS PHV_OM_OM47856U_(U)
■After charging/reconnecting the 12-volt battery
●Unlocking the doors using the smart key system may not be possible
immediately after reconnecting the 12-volt battery. If this happens, use
the wireless remote control or the mechanical key to lock/unlock the
doors.
● Start the hybrid system with the “POWER” switch in ACCESSORY mode.
The hybrid system may not start with the “POWER” switch turned off.
However, the hybrid system will operate normally from the second
attempt.
● The “POWER” switch mode is recorded by the vehicle. If the 12-volt bat-
tery is reconnected, the vehicle will return the “POWER” switch mode to
the status it was in before the 12-volt battery was disconnected. Make
sure to turn off the power before disconnect the 12-volt battery. Take
extra care when connecting the 12-volt battery if the “POWER” switch
mode prior to discharge is unknown.
● Restart the hybrid system, depress the brake pedal, and confirm that it is
possible to shift into each shift position.
If the system will not start even after multiple attempts at all methods above,
contact your Toyota dealer.

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4-3. Do-it-yourself maintenance
PRIUS PHV_OM_OM47856U_(U)
4
Maintenance and care
CAUTION
■
Chemicals in the 12-volt battery
The 12-volt battery contains poisonous and corrosive sulfuric acid and may
produce hydrogen gas which is flammable and explosive. To reduce the risk
of death or serious injury, take the following precautions while working on or
near the 12-volt battery:
●Do not cause sparks by touching the 12-volt battery terminals with tools.
● Do not smoke or light a match near the 12-volt battery.
● Avoid contact with eyes, skin and clothes.
● Never inhale or swallow electrolyte.
● Wear protective safety glasses when working near the 12-volt battery.
● Keep children away from the 12-volt battery.
■ Where to safely charge the 12-volt battery
Always charge the 12-volt battery in an open area. Do not charge the 12-volt
battery in a garage or closed room where there is insufficient ventilation.
■ How to charge the 12-volt battery
Only perform a slow charge (5 A or less). The 12-volt battery may explode if
charged at a quicker rate.

478 4-3. Do-it-yourself maintenance
PRIUS PHV_OM_OM47856U_(U)
CAUTION
■Emergency measures regarding electrolyte
●If electrolyte gets in your eyes
Flush your eyes with clean water for at least 15 minutes and get immedi-
ate medical attention. If possible, continue to apply water with a sponge or
cloth while traveling to the nearest medical facility.
● If electrolyte gets on your skin
Wash the affected area thoroughly. If you feel pain or burning, get medical
attention immediately.
● If electrolyte gets on your clothes
It can soak through clothing on to your skin. Immediately take off the cloth-
ing and follow the procedure above if necessary.
● If you accidentally swallow electrolyte
Drink a large quantity of water or milk. Get emergency medical attention
immediately.
■ When replacing the 12-volt battery
Use a 12-volt battery designed for this vehicle. Failure to do so may ca\
use
gas (hydrogen) to enter the passenger co mpartment, causing a fire or explo-
sion.
For replacement of the 12-volt battery, contact your Toyota dealer.
NOTICE
■ When charging the 12-volt battery
Never charge the 12-volt battery while the hybrid system is operating. Also,
be sure all accessories are turned off.

When trouble arises5
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5-1. Essential informationEmergency flashers ......... 526
If your vehicle needs to be towed ........................ 527
If you think something is wrong ......................... 534
5-2. Steps to take in an emergency
If a warning light turns on or a warning buzzer
sounds ........................... 535
If a warning message is displayed .................... 548
If you have a flat tire......... 569
If the hybrid system will not start .......................... 591
If you lose your keys ........ 593
If the electronic key does not operate properly....... 594
If the 12-volt battery is discharged ..................... 597
If your vehicle overheats ....................... 603
If the vehicle becomes stuck .............................. 608
If your vehicle has to be stopped in an
emergency ..................... 610

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5-1. Essential information
Emergency flashers
■Emergency flashers
If the emergency flashers are used for a long time while the hybrid system is
not operating (while the “READY” indi cator is not illuminated), the 12-volt
battery may discharge.
The emergency flashers are used to warn other drivers when the
vehicle has to be stopped in the road due to a breakdown, etc.
Press the switch.
All the turn signal lights will
flash.
To turn them off, press the
switch once again.