2021 TOYOTA PRIUS key battery

700
PRIUS_OM_OM47E09U_(U)
8-2. Customization
■Vehicle customization
●When the Speed linked door locking function and the Shift posit ion linked
door locking function are both on, the door lock operates as fo llows.
• When shifting the shift position to any position other than P, all the doors
will be locked.
• If the vehicle is started with all the doors locked, the Speed linked door locking function would not operate.
• If the vehicle is started with any door unlocked, the Speed linked door locking function will operate.
● When the smart key system is off, Smart door unlocking cannot b e custom-
ized.
● When the doors remain closed after unlocking the doors and the automatic
door lock function is activated, the signals will be generated in accordance
with the operation signal (buzzer) and the operation signal (em ergency
flashers) settings.
■ In the following situations, customize mode will automatically be turned
off.
● A warning message appears after the customize mode screen is di splayed.
● The power switch is turned off.
● The vehicle begins to move while the customize mode screen is d isplayed.
WARNING
■Cautions during customization
As the hybrid system needs to be operating during customization, ensure
that the vehicle is parked in a place with adequate ventilation. In a closed
area such as a garage, exhaust gases including harmful carbon monoxide
(CO) may collect and enter the vehicle. This may lead to death or a serious
health hazard.
NOTICE
■ During customization
To prevent 12-volt battery discharge, ensure that the hybrid sy stem is oper-
ating while customizing features.

720What to do if... (Troubleshooting)
PRIUS_OM_OM47E09U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys can be
made by your Toyota dealer. ( P. 181)
●If you lose your electronic keys, the risk of vehicle theft inc reases signifi-
cantly. Contact your Toyota dealer immediately. ( P. 184)
●Is the electronic key battery weak or depleted? (P. 560)
●Is the power switch in ON mode?
When locking the doors, turn the power switch off. ( P. 247)
●Is the electronic key left inside the vehicle?
When 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. 198)
●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. 188)
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
The rear door cannot be opened

721What to do if... (Troubleshooting)
PRIUS_OM_OM47E09U_(U)
●Did you press the power switch while firmly depressing the brake pedal?
(P. 245)
●Is the shift position in P? ( P. 256)
●Is the electronic key anywhere detectable inside the vehicle? ( P. 196)
●Is the electronic key battery weak or depleted?
In this case, the hybrid system can be started in a temporary way.
(P. 648)
●Is the 12-volt battery discharged? ( P. 650)
●Is the window lock switch pressed?
The power windows except for the one at the driver’s seat canno t be oper-
ated if the window lock switch is pressed. ( P. 218)
●The auto power off function will be operated if the vehicle is left in
ACCESSORY or ON mode (the hybrid system is not operating) for a
period of time. ( P. 247)
If you think something is wrong
The hybrid system does not start
The windows do not open or close by operating the power
window switches
The power switch is turned off automatically

726Alphabetical index
PRIUS_OM_OM47E09U_(U)
Bottle holders .......................... 464
BrakeFluid ...................................... 671
Parking brake........................ 262
Regenerative braking.............. 86
Warning light ......................... 592
Brake assist ............................. 420
Brake Override System ........... 229
Break-in tips ............................. 230
Brightness control Instrument cluster light
control................................. 100
BSM (Blind Spot Monitor) ....... 349 Blind Spot Monitor
function ............................... 354
Rear Cross Traffic Alert function ............................... 357
Care................................... 496, 502 Aluminum wheels.................. 497
Exterior ................................. 496
Front camera ........................ 291
Interior................................... 502
Radar sensor ........................ 290
Seat belts .............................. 503
Water-repellent coating......... 497
Cargo capacity ......................... 242
Cargo hooks............................. 468 Catch protection function....... 219
CD player
*
Chains ...................................... 431
Child restraint system............... 56
Fixed with a LATCH
system .......... ..................... ... 69
Fixed with a seat belt .............. 63
Front passenger occupant classification syst em ............ 49
Points to remember ................ 57
Riding with children ................ 55
Types of child restraint system installation method ............... 59
Using an anchor bracket......... 72
Child safety ................................ 55 12-volt battery precautions ... 526
Airbag precautions.................. 38
Back door precautions .......... 193
Child restraint system ............. 56
How your child should wear the seat belt.......................... 31
Installing child restraints ......... 59
Moon roof precautions .......... 226
Power window lock switch .... 218
Power window precautions ... 221
Rear door child-protectors .... 188
Removed key battery precautions......................... 562
Riding with children ................ 55
Seat belt extender precautions........................... 34
Seat belt precautions .............. 68
Seat heater precautions ....... 456
Child-protectors ...................... 188
C

728Alphabetical index
PRIUS_OM_OM47E09U_(U)
DoorsAutomatic door locking and
unlocking system ................ 188
Back door.............................. 191
Door glasses ......................... 218
Door lock............................... 185
Open door warning buzzer ... 189
Open door warning light........ 594
Outside rear view mirrors...... 216
Rear door child-protectors .... 188
Side doors............................. 185
Side windows ........................ 218
Drive information ..................... 126
Drive-Start Control .................. 230
Driver’s seat belt reminder light......................................... 595
Driving ...................................... 228
Break-in tips .......................... 230
Correct driving posture ........... 28
Driving in the rain .................. 229
Driving mode select switch ... 347
Hybrid vehicle driving tips ..... 427
Procedures ........................... 228
Winter drive tips .................... 430
Dynamic radar cruise control with full-speed range ............ 326
ECB (Electronically Controlled Brake System) .... 420
Eco drive mode ........................ 347
EDR (Event data recorder) ........ 11
Electric motor (traction motor) Location .................................. 84
Specification ......................... 667 Electric Power Steering
(EPS) ...................................... 421
Function ................................ 421
Warning light......................... 593
Electronic key .......................... 180
Battery-saving function ......... 198
If the electronic key does not operate properly ........... 647
Replacing the battery............ 560
Electronically Controlled Brake System (ECB) ............. 420
Emergency flashers ................ 580
Emergency tire puncture repair kit ................................. 613
Emergency, in case of If a warning buzzer sounds... 592
If a warning light turns on ..... 592
If a warning message is displayed ............................ 603
If the 12-volt battery is
discharged.......................... 650
If the electronic key does not operate properly ........... 647
If the hybrid system will not start .............................. 645
If the vehicle becomes stuck ................................... 661
If the vehicle is trapped in rising water ......................... 582
If you have a flat tire ..... 611, 631
If you lose your keys ..... 181, 184
If you think something is wrong .............................. 591
If your vehicle has to be stopped in an emergency ... 581
If your vehicle needs to be
towed.................................. 584
If your vehicle overheats....... 656
Energy monitor ........ 127, 165, 172
E

731Alphabetical index
PRIUS_OM_OM47E09U_(U)
I/M test ...................................... 511
Identification ............................ 665Engine................................... 666
Vehicle .................................. 665
Ignition switch (power
switch) .................................... 245 Auto power off function ......... 247
Automatic hybrid system shut off feature ........................... 249
Changing the power switch modes................................. 247
If your vehicle has to be stopped in an emergency ... 581
Starting the hybrid system .... 245
Illuminated entry system ........ 460
Immobilizer system ................... 95
Indicators ................................. 107
Initialization .............................. 701 Items to initialize ................... 701
Maintenance data ................. 506
Moon roof.............................. 225
Parking Support Brake function ............................... 383
Power windows ..................... 219
S-APGS (Simple Advanced Parking Guidance
System) .............................. 410
Tire pressure warning system ......... ....................... 535
Inside rear view mirror ............ 214
Instrument cluster light
control .................................... 100
Interior lights............................ 458
Switch ........................... 459, 460
Wattage ................................ 674
Intuitive parking assist............ 362 Jack
Positioning a floor jack.......... 517
Vehicle-equipped
jack ............................. 613, 632
Jack handle ...................... 613, 632
Jam protection function
Moon roof ............................. 224
Power windows..................... 219
Keyless entry ........................... 186 Smart key system ................. 196
Wireless remote control ........ 186
Keys .......................................... 180
Battery-saving function ......... 198
Electronic key ....................... 180
Engine switch (power switch) ................................ 245
If the electronic key does not operate properly ........... 647
If you lose your keys ..... 181, 184
Key number plate ................. 180
Keyless entry ........................ 186
Mechanical key ..................... 181
Power switch ........................ 245
Replacing the battery............ 560
Smart key system ................. 196
Warning buzzer .................... 197
Wireless remote control ........ 186
Knee airbag ................................ 35
IJ
K
*: Refer to “NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.

734Alphabetical index
PRIUS_OM_OM47E09U_(U)
Personal lights ......................... 458Switch ................................... 459
Wattage ................................ 674
Power control unit coolant ..... 522 Capacity ................................ 670
Checking ............................... 522
Preparing and checking before winter....................... 430
Radiator ................................ 524
Power outlets ........................... 474
Power steering (Electric Power Steering) ..................... 421 Function ................................ 421
Warning light ......................... 593
Power switch............................ 245 Auto power off function ......... 247
Automatic hybrid system shut off feature ........................... 249
Changing the power switch modes................................. 247
If your vehicle has to be stopped in an emergency ... 581
Starting the hybrid system .... 245
Power windows........................ 218 Catch protection function ...... 219
Door lock linked window operation ............................ 220
Jam protection function......... 219
Operation .............................. 218
Window lock switch............... 218
Pre-Collision System (PCS) .... 296 Enabling/disabling the system ......... ....................... 300
Function ................................ 296
Warning light ......................... 593
Radar cruise control Dynamic radar cruise control
with full-speed range .......... 326
Radiator .................................... 524
Radio
*
RCTA (Rear Cross Traffic Alert)....................................... 357
Blind Spot Monitor function............................... 354
Rear Cross Traffic Alert
function............................... 357
Rear Cross Traffic Alert (RCTA).................................... 357
Blind Spot Monitor function............................... 354
Rear Cross Traffic Alert
function............................... 357
Rear passengers’ seat belt reminder light ........................ 595
Rear seat .................................. 206
Rear side marker lights........... 263 Light switch ........................... 263
Replacing light bulbs ............ 572
Wattage ................................ 674
Rear turn signal lights ............ 261
Replacing light bulbs ............ 572
Turn signal lever ................... 261
Wattage ................................ 674
Rear view mirror Inside rear view mirror .......... 214
Outside rear view mirrors ..... 216
Rear view monitor system
*
Rear window defogger .... 440, 450
Rear window wiper .................. 281
Refueling .................................. 283
Capacity................................ 667
Fuel types ............................. 667
Opening the fuel tank cap..... 285
When the fuel filler door cannot be opened .............. 286
Regenerative braking ................ 86
Replacing
Electronic key battery ........... 560
Fuses .................................... 563
Light bulbs ............................ 568
Tires...................................... 631
Wiper insert .......................... 556
Reporting safety defects for U.S. owners...................... 704
R