2021 TOYOTA AVALON HYBRID key battery

1984-2. Driving procedures
■Auto power off function
If the vehicle is left in ACCESSORY mode for more than 20 minutes or ON
mode (with the hybrid system not operating) for more than an hour with the
shift lever in P, the power switch will automatically turn off. However, this func-
tion cannot entirely prevent 12-volt battery discharge. Do not leave the vehi-
cle with the power switch in ACCESSORY or ON mode for long periods of
time when the hybrid system is not operating.
■Automatic hybrid system shut off feature
●The vehicle is equipped with a feature that automatically shuts off the hybrid
system when the shift lever is in P with the hybrid system operating for an
extended period.
●The hybrid system will automatically shut off after approximately 1 hour if it
has been left running while the shift lever is in P.
●The timer for the automatic hybrid system shut off feature will reset if the
brake pedal is depressed or if the shift lever is in a position other than P.
●After the vehicle is parked, if the door is locked with the door lock switch
(P. 140) from the inside or the mechanical key (P. 484) from the outside,
the automatic hybrid system shut off feature will be disabled. The timer for
the automatic hybrid system shut off feature will be re-enabled if the driver’s
door is opened.
■Sounds and vibrations specific to a hybrid vehicle
P. 78
■Electronic key battery depletion
P. 136
■When the ambient temperature is low, such as during winter driving con-
ditions
●When starting the hybrid system, the flashing time of the “READY” indicator
may be long. Leave the vehicle as it is until the “READY” indicator is steady
on, as steady means the vehicle is able to move.
●When the hybrid battery (traction battery) is extremely cold (below approxi-
mately -22°F [-30°C]) under the influence of the outside temperature, it may
not be possible to start the hybrid system. In this case, try to start the hybrid
system again after the temperature of the hybrid battery increases due to
the outside temperature increase etc.
■Conditions affecting operation
P. 151
■Notes for the entry function
P. 152
■If the hybrid system does not start
●The immobilizer system may not have been deactivated. (P. 86)
Contact your Toyota dealer.
●Check that the shift lever is securely set in P. The hybrid system may not
start if the shift lever is displaced out of P.

1994-2. Driving procedures
4
Driving
●If a message related to start-up is shown on the multi-information display,
read the message and follow the instructions.
■Steering lock
After turning the power switch off and opening and closing the doors, the
steering wheel will be locked due to the steering lock function. Operating the
power switch again automatically cancels the steering lock.
■When the steering lock cannot be released
■Steering lock motor overheating prevention
To prevent the steering lock motor from overheating, the motor may be sus-
pended if the hybrid system is turned on and off repeatedly in a short period
of time. In this case, refrain from operating the hybrid system. After about 10
seconds, the steering lock motor will resume functioning.
■When a message requesting the smart key system be inspected is dis-
played on the multi-information display
The system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer immediately.
■If the “READY” indicator does not come on
In the event that the “READY” indicator does not come on even after perform-
ing the proper procedures for starting the vehicle, contact your Toyota dealer
immediately.
■If the hybrid system is malfunctioning
P. 80
■If the electronic key battery is depleted
P. 439
■Operation of the power switch
●If the switch is not pressed shortly and firmly, the power switch mode may
not change or the hybrid system may not start.
●If attempting to restart the hybrid system immediately after turning the power
switch off, the hybrid system may not start in some cases. After turning the
power switch off, wait a few seconds before restarting the hybrid system.
■If the smart key system has been deactivated in a customized setting
P. 484 A message informing the driver that the
steering wheel is locked will be displayed
on the multi-information display.
Check that the shift lever is set in P. Press
the power switch while turning the steer-
ing wheel left and right.

2214-3. Operating the lights and wipers
4
Driving
■12-volt battery-saving function
In the following conditions, the remaining lights will go off automatically after
20 minutes in order to prevent the 12-volt battery from being discharged:
●The headlights and/or tail lights are on.
●The power switch is in ACCESSORY mode or turned off.
This function will be canceled in any of the following situations:
●When the power switch is turned to ON mode.
●When the light switch is operated.
●When a door or the trunk is opened or closed.
■Welcome lighting
If the headlight switch is turned to and the surrounding area is dark,
unlocking the doors using the smart key system or wireless remote control
will turn the parking lights and tail lights on automatically.
■Customization
Some functions can be customized. (P. 526)
NOTICE
■To prevent 12-volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is
off.

3745-4. Other interior features
NOTICE
■Conditions in which the wireless charger may not operate correctly
In the following situations, the wireless charger may not operate correctly:
●When a portable device is fully charged
●When there is a foreign object between the charging area and portable
device
●When a portable device becomes hot while charging
●When a portable device is placed on the wireless area with its charging
surface facing up
●When a portable device is not centered on the charging area
●When the vehicle is near a TV tower, electric power plant, gas station,
radio station, large display, airport or other facility that generates strong
radio waves or electrical noise
●When the portable device is in contact with, or is covered by any of the fol-
lowing metallic objects:
• Cards to which aluminum foil is attached
• Cigarette boxes that have aluminum foil inside
• Metallic wallets or bags
• Coins
• Metal hand warmers
• Media such as CDs and DVDs
●When wireless keys (that emit radio waves) other than those of your vehi-
cle are being used nearby.
If in situations other than above the wireless charger does not operate prop-
erly or the operation indicator light is blinking, the wireless charger may be
malfunctioning. Contact your Toyota dealer.
■To prevent failure or damage to data
●Do not bring magnetic cards, such as a credit card, or magnetic recording
media, close to the wireless charger while charging. Otherwise, data may
be erased due to the influence of magnetism.
Additionally, do not bring precision instruments such as wrist watches,
close to the wireless charger, as such objects may malfunction.
●Do not leave portable devices in the cabin. The temperature inside the
cabin may become high when parked in the sun, and cause damage to the
device.
■To prevent 12-volt battery discharge
Do not use the wireless charger for a long period of time with the hybrid sys-
tem stopped.

385
6Maintenance and care
6-1. Maintenance and care
Cleaning and protecting
the vehicle exterior .......... 386
Cleaning and protecting
the vehicle interior ........... 389
6-2. Maintenance
Maintenance
requirements ................... 392
General maintenance........ 394
Emission inspection and
maintenance (I/M)
programs......................... 398
6-3. Do-it-yourself
maintenance
Do-it-yourself service
precautions ..................... 399
Hood ................................. 401
Positioning a floor jack ...... 402
Engine compartment ......... 403
12-volt battery ................... 411
Tires .................................. 415
Tire inflation pressure ....... 427
Wheels .............................. 430
Air conditioning filter.......... 432
Cleaning the hybrid
battery (traction battery)
air intake vent and
filter ................................. 434
Electronic key battery........ 439
Checking and replacing
fuses ............................... 442
Light bulbs......................... 445

3876-1. Maintenance and care
6
Maintenance and care
■When using a car wash
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range, the door may lock and unlock repeatedly. In that case, follow the fol-
lowing correction procedures to wash the vehicle:
●Place the key in a position 6 ft. (2 m) or more separate from the vehicle
while the vehicle is being washed. (Take care to ensure that the key is not
stolen.)
●Set the electronic key to battery-saving mode to disable the smart key sys-
tem. (P. 150)
■Wheels and wheel ornaments
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●Wash detergent off with water immediately after use.
●To protect the paint from damage, make sure to observe the following pre-
cautions.
• Do not use acidic, alkaline or abrasive detergent
• Do not use hard brushes
• Do not use detergent on the wheels when they are hot, such as after driv-
ing or parking in hot weather
■Bumpers
Do not scrub with abrasive cleaners.
■Plated portions
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●Use a soft cloth dampened with an approximately 5% solution of neutral
detergent and water to clean the dirt off.
●Wipe the surface with a dry, soft cloth to remove any remaining moisture.
●To remove oily deposits, use alcohol wet wipes or a similar product.
WARNING
■When washing the vehicle
Do not apply water to the inside of the engine compartment. Doing so may
cause the electrical components, etc. to catch fire.
■Precautions regarding the exhaust pipes
Exhaust gasses cause the exhaust pipes to become quite hot.
When washing the vehicle, be careful not to touch the pipes until it has
cooled sufficiently, as touching a hot exhaust pipes can cause burns.
■Precaution regarding the rear bumper with Blind Spot Monitor
If the paint of the rear bumper is chipped or scratched, the system may mal-
function. If this occurs, avoid using the system and consult your Toyota
dealer.

4126-3. Do-it-yourself maintenance
Make sure that the 12-volt battery terminals are not corroded and that
there are no loose connections, cracks, or loose clamps.
Terminals
Hold-down clamp
■Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, observe the following precautions before
recharging:
●If recharging 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 dis-
connecting the charger cables to the 12-volt battery.
■After recharging/reconnecting the 12-volt battery
●Unlocking the doors using the smart key system may not be possible imme-
diately after reconnecting the 12-volt battery. If this happens, use the wire-
less 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 battery 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 disconnecting the 12-volt battery. Take extra care when
connecting the 12-volt battery if the power switch mode prior to discharge is
unknown.
If the system will not start even after multiple attempts, contact your Toyota
dealer.
Exterior
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4396-3. Do-it-yourself maintenance
6
Maintenance and care
●Flathead screwdriver
●Small flathead screwdriver
●Lithium battery CR2032
Release the lock and remove
the mechanical key.
Remove the key cover.
To prevent damage to the key,
cover the tip of the flathead screw-
driver with a rag.
Remove the depleted battery
using a small flathead screw-
driver.
When removing the cover, the
electronic key module may stick to
the cover and the battery may not
be visible. In this case, remove the
electronic key module in order to
remove the battery.
Insert a new battery with the “+” terminal facing up.
Electronic key batter y
Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery
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