2021 TOYOTA AVALON HYBRID key battery

4907-2. Steps to take in an emergency
■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 system 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.
■When the 12-volt battery is removed or discharged
●Information stored in the ECU is cleared. When the 12-volt battery is
depleted, have the vehicle inspected at your Toyota dealer.
●Some systems may require initialization. (P. 535)
■When removing the 12-volt 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 gradually even when
the vehicle is not in use, due to natural discharge and the draining effects of
certain electrical appliances. If the vehicle is left for a long time, the 12-volt
battery may discharge, and the hybrid system may be unable to start. (The
12-volt battery recharges automatically while the hybrid system is operating.)
■When recharging or replacing the 12-volt battery
●In some cases, it may not be possible to unlock the doors using the smart
key system when the 12-volt battery is discharged. 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 you are unsure what mode the power switch was in before the 12-volt bat-
tery discharged, be especially careful when reconnecting the 12-volt battery.

540What to do if... (Troubleshooting)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys can be
made by your Toyota dealer. (P. 135)
●If you lose your electronic keys, the risk of vehicle theft increases signifi-
cantly. Contact your Toyota dealer immediately. (P. 137)
●Is the key battery weak or depleted? (P. 439)
●Is the power switch in ON mode?
When locking the doors, turn the power switch off. (P. 197)
●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. 151)
●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. 141)
●The function to prevent the electronic key from being left inside the trunk
will operate and you can open the trunk as usual. Take the key out from the
trunk. (P. 145)
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
The trunk lid is closed with the electronic key left inside

541What to do if... (Troubleshooting)
●Did you press the power switch while firmly depressing the brake pedal?
(P. 196)
●Is the shift lever in P? (P. 198)
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4b0048000300590048004b004c0046004f004800220003000b[P. 148)
●Is the steering wheel unlocked? (P. 199)
●Is the electronic key battery weak or depleted?
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44000300570048005000530052005500440055005c0003005a[ay.
(P. 485)
●Is the 12-volt battery discharged? (P. 487)
●Is the power switch in ON mode?
If you cannot release the shift lever by depressing the brake pedal with the
power switch in ON mode. (P. 209)
●It is locked automatically to prevent theft of the vehicle. (P. 199)
●Is the window lock switch pressed?
The power window except for the one at the driver’s seat cannot be oper-
ated if the window lock switch is pressed. (P. 173)
●The auto power off function will be operated if the vehicle is left in ACCES-
SORY or ON mode (the hybrid system is not operating) for a period of
time. (P. 198)
If you think something is wrong
The hybrid system does not start
The shift lever cannot be shifted from P even if you depress
the brake pedal
The steering wheel cannot be turned after the hybrid system
is stopped
The windows do not open or close by operating the power
window switches
The power switch is turned off automatically

546Alphabetical index
Child safety ................................ 53
12-volt battery
precautions ................. 413, 492
Airbag precautions .................. 37
Battery precautions ....... 413, 492
Child restraint system ............. 54
How your child should wear
the seat belt .......................... 30
Installing child restraints ......... 58
Moon roof precautions .......... 180
Power window lock switch .... 173
Power window precautions ... 176
Rear door child-protectors .... 141
Removed electronic key
battery precautions ............. 440
Seat belt extender
precautions ........................... 33
Seat belt precautions .............. 32
Seat heater precautions........ 349
Trunk precautions ................. 146
Child-protectors....................... 141
Cleaning ........................... 386, 389
Exterior ................................. 386
Interior................................... 389
Seat belts .............................. 390
Wheels and wheel
ornaments .......................... 387
Coat hooks ............................... 376
Condenser ................................ 408
Connected Services
*
Console box ............................. 356
Consumption
screen............................. 106, 128
Coolant
Capacity ................................ 506
Checking ............................... 407
Preparing and checking
before winter....................... 333
Cooling system ........................ 407
Hybrid system
overheating......................... 494
Cornering lights ....................... 219Cruise control
Dynamic radar cruise control
with full-speed range .......... 263
Cup holders ............................. 358
Curtain shield airbags............... 35
Customizable features ............ 526
Daytime running light
system.................................... 219
Defogger
Outside rear view mirrors ..... 343
Rear window ......................... 343
Windshield ............................ 343
Dimensions .............................. 502
Dinghy towing.......................... 195
Display
Dynamic radar cruise control
with full-speed range .......... 263
LDA (Lane Departure Alert
with steering control) .......... 258
Multi-information display ....... 102
Warning messages ............... 465
Do-it-yourself maintenance .... 399
Door courtesy lights
Location ................................ 352
Wattage ................................ 509
Door lock
Doors .................................... 138
Smart key system ................. 138
Wireless remote control ........ 138
Doors ........................................ 138
Automatic door locking
and unlocking systems ....... 141
Door lock .............................. 140
Outside rear view mirrors ..... 170
Rear door child-protector ...... 141
Side doors ............................ 138
Side windows........................ 173
Drive-Start Control .................. 184
Driver’s seat belt
reminder light ........................ 458
D

547Alphabetical index
Driver’s seat position
memory .................................. 159
Driving
Break-in tips .......................... 184
Correct posture ....................... 26
Driving mode select
switches.............................. 321
Hybrid vehicle driving tips ..... 330
Procedures ........................... 182
Winter drive tips .................... 333
Driving information ................. 106
Driving position memory ........ 159
Memory recall function.......... 162
Power easy access
system ................................ 159
Dynamic radar cruise control
with full-speed range ............ 263
ECO Accelerator Guidance..... 109
Eco drive mode ........................ 321
Eco guide ................................. 109
Eco score ................................. 109
EDR
(Event data recorder) .............. 10
Electric motor
(traction motor) ....................... 79
Electric Power Steering
(EPS)....................................... 324
Warning light ......................... 457
Electronic key .......................... 134
Battery-saving function ......... 150
If the electronic key does
not operate properly ........... 484
Replacing the battery ............ 439
Emergency flashers ................ 448Emergency, in case of
If a warning buzzer
sounds................................ 455
If a warning light turns on ..... 455
If a warning message is
displayed ............................ 465
If the 12-volt battery is
discharged.......................... 487
If the electronic key does not
operate properly ................. 484
If the hybrid system
will not start ........................ 482
If the vehicle is trapped in
rising water ......................... 450
If you have a flat tire ............. 471
If you lose your keys ..... 135, 137
If you think something is
wrong ................................. 454
If your vehicle becomes
stuck ................................... 498
If your vehicle has to be
stopped in an emergency ... 449
If your vehicle needs to be
towed.................................. 451
If your vehicle overheats....... 494
E
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM
OWNER’S MANUAL”.

550Alphabetical index
I/M test ...................................... 398
ICS (Intelligent Clearance
Sonar) ..................................... 300
Warning light ......................... 457
Warning messages ............... 311
Identification
Engine................................... 503
Vehicle .................................. 503
Ignition switch
(power switch) ....................... 196
Illuminated entry system ........ 354
Immobilizer system ................... 86
Indicators ................................... 95
Initialization
Intelligent Clearance
Sonar .................................. 311
Items to initialize ................... 535
Tire pressure
warning system .................. 416
Inside rear view mirror ............ 168
Instrument panel light
control ...................................... 99
Intelligent Clearance
Sonar (ICS)............................. 300
Warning light ......................... 457
Warning messages ............... 311
Interior lights............................ 352
Switch ................................... 353
Intuitive parking assist............ 292
Jack
Positioning the jack ............... 402
Vehicle-equipped jack........... 471
Jack handle .............................. 471
Jam protection function
Moon roof.............................. 178
Power window....................... 173Keyless entry
Smart key system ......... 138, 144
Wireless remote
control ........................ 138, 145
Keys .......................................... 134
Battery-saving function ......... 150
Electronic key ....................... 134
Engine switch ....................... 196
If the electronic key does
not operate properly ........... 484
If you lose your keys ..... 135, 137
Key number plate ................. 134
Keyless entry ........................ 134
Mechanical key ..................... 135
Power switch ........................ 196
Replacing the battery............ 439
Warning buzzer .................... 149
Wireless remote control ........ 134
Knee airbags .............................. 34
Lane Departure Alert with
steering control (LDA) .......... 252
Language (multi-
information display).............. 116
LATCH anchors ......................... 59
LDA (Lane Departure Alert
with steering control) ........... 252
Lever
Auxiliary catch lever.............. 401
Hood lock release lever ........ 401
Internal trunk release lever ... 146
Shift lever.............................. 205
Tilt and telescopic steering
lock release lever ............... 166
Turn signal lever ................... 211
Wiper lever ........................... 226
License plate lights
Light switch ........................... 218
Replacing light bulbs ............ 445
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553Alphabetical index
Radar cruise control
(dynamic radar cruise
control with full-speed
range) ..................................... 263
Radiator .................................... 408
Rear Camera Detection
Function ................................. 288
Rear Cross Traffic Alert .......... 283
Rear Cross Traffic
Auto Brake ............................. 302
Rear passengers’ seat belt
reminder light ........................ 458
Rear personal lights ................ 353
Rear seat
Folding down ........................ 157
Rear seat heaters..................... 349
Rear side marker lights
Light switch ........................... 218
Replacing light bulbs............. 445
Rear turn signal lights
Replacing light bulbs............. 445
Turn signal lever ................... 211Rear view mirror
Inside rear view mirror .......... 168
Outside rear view mirrors ..... 170
Rear window defogger ............ 343
Refueling .................................. 230
Capacity................................ 504
Fuel types ..................... 504, 510
If the fuel filler door
cannot be opened .............. 234
Opening the fuel tank cap..... 233
Replacing
Electronic key battery ........... 439
Fuses .................................... 442
Light bulbs ............................ 445
Tires...................................... 471
Reporting safety defects
for U.S. owners...................... 538
Resetting the message
indicating maintenance is
required.................................. 393
Road accident cautions ............ 83
R
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM
OWNER’S MANUAL”.

558Alphabetical index
TRAC (Traction Control) ......... 323
Traction battery
(hybrid battery) ........................ 79
Traction Control (TRAC) ......... 323
Traction motor
(electric motor) ........................ 75
Trailer towing .......................... 194
Transmission
Driving mode select
switches.............................. 321
Hybrid transmission .............. 205
If the shift lever cannot be
shifted from P ..................... 209
Paddle shift switches ............ 208
S mode ................................. 207
Trip meters ................................. 98
Trunk......................................... 144
Cargo net .............................. 361
Grocery bag hooks ............... 361
Internal trunk release lever ... 146
Smart key system ................. 144
Trunk light ............................. 145
Trunk opener ........................ 144
Wireless remote control ........ 145
Trunk light
Trunk light ............................. 145
Wattage ................................ 509
Turn signal lights
Replacing light bulbs............. 445
Turn signal lever ................... 211
USB charging port ................... 364Vanity lights ............................. 362
Wattage ................................ 509
Vanity mirrors .......................... 362
Vanity lights .......................... 362
Vehicle data recording ................ 8
Vehicle identification
number ................................... 503
Vehicle Stability Control
(VSC) ...................................... 323
VSC
(Vehicle Stability Control) .... 323
Warning buzzers
Approach warning................. 271
Brake system ........................ 455
Downshifting ......................... 208
Electric power steering
system ................................ 457
Intuitive parking assist .......... 295
Lane departure alert
function............................... 253
Light reminder....................... 220
Open door............................. 142
Open hood ............................ 401
Open moon roof.................... 179
Open trunk ............................ 145
Parking brake ....................... 456
Pre-collision warning ............ 242
Seat belt reminder ................ 458
Vehicle sway warning ........... 255
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