2021 TOYOTA AYGO key battery

4978-2. Steps to take in an emergency
8
When trouble arises
AYGO_OM_Europe_OM9A012E
If the electronic key does not operate properly
(vehicles with a smar t entr y & star t system)
Use the mechanical key (P. 1 1 4 )
in order to perform the following
operations:
Locks all the doors
Unlocks all the doors
If communication between the electronic key and vehicle is
interrupted ( P. 146) or the electronic key cannot be used
because the battery is depleted, the smart entry & start system
and wireless remote control cannot be used. In such cases, the
doors can be opened and the engine can be started by following
the procedure below.
Locking and unlocking the doors
1
2

4998-2. Steps to take in an emergency
8
When trouble arises
AYGO_OM_Europe_OM9A012E
■Stopping the engine
Shift the shift lever to N and press the engine switch as you normally do when
stopping the engine.
■ 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. 415)
■ Changing engine switch modes
Release the brake pedal (multi-mode m anual transmission) or clutch pedal
(manual transmission) and press t he engine switch in step above.
The engine does not start and modes will be changed each time the switch is
pressed. ( P. 219)
■ When the electronic key does not work properly
● Make sure that the smart entry & start system has not been deactivated in
the customization setting. If it is off, turn the function on.
(Customizable features: P. 523)
● Check if battery-saving mode is set. If it is set, cancel the function.
( P. 146)

5028-2. Steps to take in an emergency
AYGO_OM_Europe_OM9A012E
■ Precautions when the battery is discharged (vehicles with a smart entry
& start system)
● In some cases, it may not be possible to unlock the doors using the smart
entry & start system when the battery is discharged. Use the wireless
remote control or the mechanical key to lock or unlock the doors.
● The engine may not start on the first attempt after the battery has recharged
but will start normally after the second attempt. This is not a malfunction.
● The engine switch mode is memorized by the vehicle. When the battery is
reconnected, the system will return to the mode it was in before the battery
was discharged. Before disconnecting the battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery dis-
charged, be especially careful when reconnecting the battery.
■ When replacing the battery
● Use a battery that conforms to European regulations.
● Use a battery with the same case size as the previous one;
vehicles without cold area specifications or a stop & start system: (LN0),
20 hours rate capacity (20HR) is equiva lent (35Ah) or greater, and perfor-
mance rating (CCA) is equivalent (300A) or greater;
vehicles with cold area specifications: (LN0), 20 hours rate capacity (20HR)
is equivalent (42Ah) or greater, and performance rating (CCA) is equivalent
(390A) or greater; or
vehicles with a stop & start system: (LN2), 20 hours rate capacity (20HR) is
equivalent (60Ah) or greater, and performance rating (CCA) is equivalent
(540A) or greater.
• If the sizes differ, the battery cannot be properly secured.
• If the 20 hour rate capacity is low, even if the time period where the vehi-
cle is not used is a short time, the battery may discharge and the engine
may not be able to start.
● For details, consult any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.

526What to do if... (Troubleshooting)
AYGO_OM_Europe_OM9A012E
What to do if... (Troubleshooting)
●If you lose your keys or mechanical keys, new genuine keys or mechanical
keys can be made by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer. (P. 1 1 4 )
●Vehicles with a smart entry & start system
If you lose your electronic keys, the risk of vehicle theft increases signifi-
cantly. Contact any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer immediately. (P. 131)
●Is the key battery weak or depleted? (P. 415)
●Vehicles with a smart entry & start system
Is the engine switch in IGNITION ON mode?
When locking the doors, turn the engine switch off. (P. 219)
●Vehicles with a smart entry & start system
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 the radio
wave. (P. 136, 146)
●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. 135)
If you have a problem, check the following before contacting any
authorized Toyota retailer or Toyota authorized repairer, or any
reliable repairer.
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 (5-door models)

527What to do if... (Troubleshooting)
AYGO_OM_Europe_OM9A012E
●Vehicles with a multi-mode manual transmission
Do you turn the key with the brake pedal depressed firmly? ( P. 214)
●Vehicles with a manual transmission
Do you turn the key with the clutch pedal depressed firmly? ( P. 214)
●Is the battery discharged? (P. 500)
●Vehicles with a multi-mode manual transmission
Did you press the engine switch while firmly depressing the brake pedal?
( P. 217)
●Vehicles with a manual transmission
Did you press the engine switch while firmly depressing the clutch pedal?
( P. 217)
●Is the electronic key anywhere detectable inside the vehicle? (P. 144)
●Is the steering wheel unlocked? (P. 220)
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a temporary way. ( P. 498)
●Is the battery discharged? (P. 500)
●Vehicles without a smart entry & start system
Is the engine switch in the “ON” position?
If you cannot release the shift lever by depressing the brake pedal with the
engine switch in the “ON” position: P. 496
●Vehicles with a smart entry & start system
Is the engine switch in IGNITION ON mode?
If you cannot release the shift lever by depressing the brake pedal with the
engine switch in IGNITION ON mode: P. 496
If you think something is wrong
The engine does not start
(vehicles without a smart entry & start system)
The engine does not start
(vehicles with a smart entry & start system)
The shift lever cannot be shifted even if you depress the
brake pedal (vehicles with a multi-mode manual transmis-
sion)

531Alphabetical index
AYGO_OM_Europe_OM9A012E
Back door ................................. 137
Back-up lights
Replacing light bulbs ............. 432
Wattage................................. 520
Battery ...................................... 399
Battery checking ................... 399
If the vehicle battery is
discharged .......................... 500
Preparing and checking
before winter....................... 285
Replacing .............................. 502
Warning light ......................... 449
Bluetooth
®*
Audio system ........................ 336
Hands-free system
(for cellular phone).............. 338
Bottle holders........................... 369
Brake
Emergency brake signal ....... 279
Fluid ...................................... 518
Parking brake ........................ 230
Warning light ......................... 449
Brake assist.............................. 279
Break-in tips ............................ 205
Brightness control
Instrument cluster light
control................................. 108Canvas top ............................... 197
Care................................... 378, 382
Aluminum wheels.................. 379
Canvas top............................ 378
Exterior ................................. 378
Interior................................... 382
Seat belts .............................. 383
Chains....................................... 285
Child restraint system ............... 52
Fixed with a seat belt .............. 59
Fixed with an ISOFIX
lower anchorage ................... 70
Points to remember ................ 53
Riding with children................. 51
Types of child restraint system
installation method ............... 67
Using a top tether
anchorage ............................ 72
Child safety ................................ 51
Airbag precautions .................. 39
Back door precautions .......... 140
Battery precautions ....... 399, 503
Canvas top precautions ........ 198
Child restraint system ............. 52
How your child should wear
the seat belt.......................... 33
Installing child restraints ......... 67
Power window precautions ... 194
Rear door child-protectors .... 135
Removed key battery
precautions......................... 417
Seat belt precautions .............. 34
Seat heater precautions........ 365
BC
*: For vehicles with a multimedia system, refer to “Multimedia owner’s manual”.

533Alphabetical index
AYGO_OM_Europe_OM9A012E
Electric Power Steering
(EPS) ....................................... 279
Function ................................ 279
Warning light ......................... 451
Electronic key .......................... 112
Battery-saving function ......... 146
If the electronic key does not
operate properly ................. 497
Replacing the battery ............ 415
Emergency, in case of
If the electronic key does not
operate properly ................. 497
If the engine will not start ...... 494
If the shift lever cannot be
shifted ................................. 496
If the vehicle has discharged
battery................................. 500
If the vehicle is trapped in
rising water ......................... 441
If the warning buzzer
sounds ................................ 449
If the warning light
turns on............................... 449
If you have a flat tire...... 459, 481
If you lose your keys ............. 114
If you think something is
wrong .................................. 447
If your vehicle becomes
stuck ................................... 507
If your vehicle needs to be
towed .................................. 442
If your vehicle overheats ....... 504
Emergency brake signal ......... 279
Emergency flashers................. 438
Emergency tire puncture
repair kit ................................. 459Engine
“ACC” position ...................... 214
Accessory mode ................... 219
Compartment ........................ 393
Engine switch................ 214, 217
Hood ..................................... 390
How to start
the engine................... 214, 217
If the engine will not start ...... 494
Ignition switch
(engine switch) ........... 214, 217
Overheating .......................... 504
Engine coolant ......................... 397
Capacity ................................ 515
Checking ............................... 397
Preparing and checking
before winter....................... 285
Engine coolant
temperature
warning light .......................... 450
Engine immobilizer system ...... 75
Engine oil ................................. 394
Capacity ................................ 512
Checking ............................... 394
Preparing and checking
before winter....................... 285
Engine switch
(ignition switch)............. 214, 217
EPS (Electronic Power
Steering)................................. 279
Function ................................ 279
Warning light ......................... 451
E

535Alphabetical index
AYGO_OM_Europe_OM9A012E
Identification ............................ 511
Vehicle .................................. 511
Ignition switch
(engine switch) .............. 214, 217
Immobilizer system ................... 75
Indicators.................................... 98
Initialization
Tire pressure warning
system ................................ 405
Inside rear view mirror ............ 191
Instrument cluster light
control .................................... 108
Interior lights ............................ 366
Switch ................................... 366
Wattage................................. 520
ISOFIX lower anchorages......... 70
Jack
Positioning a floor jack .......... 392
Vehicle-equipped jack ... 461, 482Keyless entry
Smart entry &
start system ................ 133, 137
Wireless remote
control......................... 133, 137
Keys .......................................... 112
Battery-saving function ......... 146
Electronic key ....................... 112
Engine switch................ 214, 217
If the electronic key does not
operate properly ................. 497
If you lose your keys ............. 114
Key number plate.................. 112
Keyless entry ................ 113, 143
Keys ...................................... 112
Replacing the battery ............ 415
Warning buzzer..................... 145
Wireless remote control
key...................................... 113
I
J
K
*: For vehicles with a multimedia system, refer to “Multimedia owner’s manual”.