2019 TOYOTA PRIUS C key battery

5178-2. Steps to take in an emergency
8
When trouble arises
PRIUS c_U
Use the mechanical key (P. 1 1 9 )
in order to perform the following
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. 141) 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
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2

5188-2. Steps to take in an emergency
PRIUS c_U
Firmly depress the brake pedal and check that is displayed
on the multi-information display.
Press the power switc h shortly and firmly.
In the event that the power s witch still cannot be operated, co ntact
your Toyota dealer.
■ Stopping the hybrid system
Shift the shift lever 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 recommende d that the
electronic key battery be replaced immediately when the battery is depleted.
( P. 449)
■ Changing power switch modes
Release the brake pedal and press the power switch in above.
The hybrid system does not start and modes will be changed each time the
switch is pressed. ( P. 191)
■ If the doors cannot be locked o r unlocked by the smart key syst em
Lock and unlock the doors by the mechanical key or wireless rem ote control.
■ 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. 558)
● Check if battery-saving mode is set. If it is set, cancel the f unction.
( P. 140)
3
4
3

5208-2. Steps to take in an emergency
PRIUS c_U
Connect the jumper cables according to the following procedure:Connect a positive jumper cable clamp to the exclusive jump
starting terminal on your vehicle.
Connect the clamp on the other end of the positive cable to the
positive (+) battery termi nal on the second vehicle.
Connect a negative cable clamp to the negative (-) battery term i-
nal on the s econd vehicle.
Connect the clamp at the other e nd of the negative cable to a
solid, stationary, unpainted meta llic point away from the exclusive
jump starting terminal and any moving parts, as shown in the
illustration.
Start the engine of the second v ehicle. Increase the engine speed
slightly and maintain at that lev el for approximately 5 minutes to
recharge the 12-volt battery of your vehicle.
Vehicles with a smart key system only: Open and close any of th e
doors of your vehicle wi th the power switch off.3
1
2
3
4
4
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5228-2. Steps to take in an emergency
PRIUS c_U
■Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.
■ To prevent 12-volt battery discharge
●Turn off the headlights and the audio system while the hybrid s ystem is off.
● Turn off any unnecessary electrical components when the vehicle is running
at a low speed for an extended period, such as in heavy traffic .
■ Precautions when the 12-volt batte ry is discharged (vehicles with a
smart key system)
● In some cases, it may not be possible to unlock the doors using the smart
key system immediately after the 12-volt battery has been disco nnected and
reconnected. Use the wireless remote control or the mechanical key to lock
or unlock the doors.
● The hybrid system may not start on the first attempt after the 12-volt battery
has recharged but will start normally after the second attempt. This is not a
malfunction.
● The power switch mode is memorized by the vehicle. When the 12- volt bat-
tery is reconnected, the system will return to the mode it was in before the
12-volt battery was discharged. Before disconnecting the 12-volt battery,
turn the power switch off.
If the power switch was in ACCESSORY or ON mode before the 12-volt bat-
tery was discharged, the audio system and/or air conditioning system may
operate when the 12-volt battery is reconnected.
■ When the 12-volt battery is removed or discharged
● Information stored in the ECU is cleared. When the 12-volt batt ery is
depleted, have the vehicle inspected at your Toyota dealer.
● Some systems may require initialization. ( P. 563)
■ When removing the 12-vo lt battery terminals
When the 12-volt battery terminals are removed, the information stored in the
ECU is cleared. Before removing the 12-volt battery terminals, contact your
Toyota dealer.
■ Charging the 12-volt battery
The electricity stored in the 12-volt battery will discharge gr adually even when
the vehicle is not in use, due to natural discharge and the dra ining effects of
certain electrical appliances. If the vehicle is left for a lon g time, the 12-volt
battery may discharge, and the hybrid system may be unable to s tart. (The
12-volt battery recharges automatically while the hybrid system is operating.)

580
PRIUS c_U
What to do if... (Troubleshooting)
What to do if... (Troubleshooting)
●If you lose your keys or mechanical keys, new genuine keys or mechanical
keys can be made by your Toyota dealer. (P. 120)
●If you lose your keys or electronic keys, the risk of vehicle t heft increases
significantly. Contact your Toyota dealer immediately. ( P. 124)
●Is the key battery weak or depleted? (P. 449)
●Vehicles with a smart key system:
Is the power switch in ON mode?
Wh en locking the doors, turn the power switch off. ( P. 191)
●Vehicles with a smart key system:
Is the electronic key left inside the vehicle?
Wh en locking the doors, make sure that you have the electronic key on
your person.
●The function may not operate properly due to the condition of t he radio
wave. ( P. 141)
If you have a problem, check the following before contacting
your Toyota dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked

581What to do if... (Troubleshooting)
PRIUS c_U
●Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle when the lock is
set. Open the rear door from outside and then unlock the child-protector
lock. ( P. 129)
●Is the shift lever in P? ( P. 186)
●Is the steering wheel unlocked? ( P. 188)
●Is the 12-volt battery discharged? ( P. 519)
●Did you press the power switch while firmly depressing the brak e pedal?
( P. 190)
●Is the shift lever in P? ( P. 193)
●Is the electronic key anywhere detectable inside the vehicle?
(P. 139)
●Is the steering wheel unlocked? ( P. 193)
●Is the electronic key battery weak or depleted?
In this case, the hybrid system can be started in a temporary way.
(P. 517)
●Is the 12-volt battery discharged? ( P. 519)
The rear door cannot be opened
If you think something is wrong
The hybrid system does not start
(vehicles without a smart key system)
The hybrid system does not start
(vehicles with a smart key system)

587Alphabetical index
PRIUS c_U
Child safetyAirbag precautions .................. 42
Child-protectors .................... 129
Child restraint system ............. 58
How your child should
wear the seat belt ................. 34
Installing child restraints ......... 62
Moon roof precautions .......... 167
Power window lock switch .... 161
Power window precautions ... 164
Removed key battery precautions ......................... 451
Seat belt extender precautions ........................... 38
Seat belt precautions .............. 36
Seat heater precautions........ 382
12-volt battery precautions ................. 431, 525
Cleaning Exterior ................................. 398
Interior................................... 401
Seat belts .............................. 404
Clock ......................................... 106
Coat hooks ............................... 393
Condenser ................................ 426
Console box ............................. 387
Cooling system
Hybrid system overheating ... 526
Cord hook................................. 282
Cruise control .......................... 249
Cup holders.............................. 389
Curtain shield airbags ............... 40
Customizable features ............ 558 Daytime running light
system.................................... 208
Defogger Rear window ......................... 376
Side mirrors .......................... 376
Dimension ................................ 534
Dinghy towing.......................... 185
Display Energy flow ........................... 110
Multi-information display ....... 101
Trip information..................... 101
Warning message................. 485
Do-it-yourself maintenance .... 414
Doors Back door ............................. 134
Door lock .............................. 128
Door windows ....................... 161
Rear door child protector ...... 129
Side doors ............................ 125
Side mirrors .......................... 159
Driver’s seat belt reminder light ........................................ 479
Driving
Break-in tips.......................... 172
Correct posture ....................... 28
Procedures ........................... 170
Winter driving tips ................. 272D

588Alphabetical index
PRIUS c_U
Eco drive mode ........................ 201
Electric power steering ........... 263
Electronic keyIf the electronic key does not operate properly ........... 517
Emergency flashers Switch ................................... 466
Emergency, in case of
If a warning buzzer sounds ........................ 477, 485
If a warning light
turns on .............................. 477
If a warning message is displayed ............................ 485
If the electronic key does not operate properly ........... 517
If the hybrid system will
not start .............................. 515
If the vehicle becomes stuck ................................... 530
If the vehicle 12-volt battery is discharged .......... 519
If you have a flat tire ............ 502
If you lose your keys ............. 120
If you think something is
wrong.................................. 476
If your vehicle has to
be stopped in an
emergency.......................... 467
If your vehicle needs to
be towed ............................. 469
If your vehicle overheats ....... 526 Engine
Compartment ........................ 420
Hood ..................................... 417
How to start the hybrid system ....... ................. 186, 190
Identification number ............ 535
If the hybrid system will not start .............................. 515
Ignition switch ............... 186, 190
Overheating .......................... 526
Power switch ................ 186, 190
Engine coolant Capacity................................ 538
Checking............................... 424
Preparing and checking before winter ...................... 272
Engine oil
Capacity................................ 537
Checking............................... 421
Preparing and checking before winter ...................... 272
Engine/power control unit coolant
Capacity................................ 538
Checking............................... 424
Preparing and checking before winter ...................... 272
EPS ........................................... 263
EV drive mode ......................... 197
Event data recorder................... 11
Exclusive jump starting terminal .................... 519
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