2021 TOYOTA AVALON HYBRID ECU

1924-1. Before driving
WARNING
■Things that must not be carried in the trunk
The following things may cause a fire if loaded in the trunk:
●Receptacles containing gasoline
●Aerosol cans
■Storage precautions
Observe the following precautions.
Failure to do so may prevent the pedals from being depressed properly,
may block the driver’s vision, or may result in items hitting the driver or
passengers, possibly causing an accident.
●Stow cargo and luggage in the trunk whenever possible.
●To prevent cargo and luggage from sliding forward during braking, do
not stack anything in the enlarged trunk. Keep cargo and luggage low,
as close to the floor as possible.
●Do not place cargo or luggage in or on the following locations.
• At the feet of the driver
• On the front passenger or rear seats (when stacking items)
• On the package tray
• On the instrument panel
• On the dashboard
• Tray that has no lid
●Secure all items in the occupant compartment.
●When you fold down the rear seats, long items should not be placed
directly behind the front seats.
●Never allow anyone to ride in the enlarged trunk. It is not designed for
passengers. They should ride in their seats with their seat belts prop-
erly fastened.
■Capacity and distribution
●Do not exceed the maximum axle weight rating or the total vehicle
weight rating.
●Even if the total load of occupant's weight and the cargo load is less
than the total load capacity, do not apply the load unevenly. Improper
loading may cause deterioration of steering or braking control which
may cause death or serious injury.

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.

2314-4. Refueling
4
Driving
WARNING
■When refueling the vehicle
Observe the following precautions while refueling the vehicle. Failure to do
so may result in death or serious injury.
●After exiting the vehicle and before opening the fuel door, touch an
unpainted metal surface to discharge any static electricity. It is important to
discharge static electricity before refueling because sparks resulting from
static electricity can cause fuel vapors to ignite while refueling.
●Always hold the grips on the fuel tank cap and turn it slowly to remove it.
A whooshing sound may be heard when the fuel tank cap is loosened.
Wait until the sound cannot be heard before fully removing the cap. In hot
weather, pressurized fuel may spray out the filler neck and cause injury.
●Do not allow anyone that has not discharged static electricity from their
body to come close to an open fuel tank.
●Do not inhale vaporized fuel.
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●Do not smoke while refueling the vehicle.
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●Do not return to the vehicle or touch any person or object that is statically
charged.
This may cause static electricity to build up, resulting in a possible ignition
hazard.
■When refueling
Observe the following precautions to prevent fuel overflowing from the fuel
tank:
●Securely insert the fuel nozzle into the fuel filler neck.
●Stop filling the tank after the fuel nozzle automatically clicks off.
●Do not top off the fuel tank.

2824-5. Using the driving support systems
■Conditions under which the BSM function will not detect a vehicle
The BSM function is not designed to detect the following types of vehicles
and/or objects:
●Small motorcycles, bicycles, pedestrians, etc.
*
●Vehicles traveling in the opposite direction
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*
●Following vehicles that are in the same lane*
●Vehicles driving 2 lanes across from your vehicle*
●Vehicles which are being overtaken rapidly by your vehicle
*: Depending on the conditions, detection of a vehicle and/or object may
occur.
■Conditions under which the BSM function may not function correctly
●The BSM function may not detect vehicles correctly in the following condi-
tions:
• When the sensor is misaligned due to a strong impact to the sensor or its
surrounding area
• During bad weather such as heavy rain, fog, snow, etc.
• When mud, snow, ice, a sticker, etc., is covering the sensor or surround-
ing area on the rear bumper
• When driving on a road surface that is wet due to rain, standing water,
snow, etc.
• When there is a significant difference in speed between your vehicle and
the vehicle that enters the detection area
• When a vehicle is in the detection area from a stop and remains in the
detection area as your vehicle accelerates
• When driving up or down consecutive steep inclines, such as hills, a dip
in the road, etc.
• When driving on roads with sharp bends, consecutive curves, or uneven
surfaces
• When multiple vehicles approach with only a small gap between each
vehicle
• When vehicle lanes are wide, and the vehicle in the next lane is too far
away from your vehicle
• When the vehicle that enters the detection area is traveling at about the
same speed as your vehicle
• When there is a significant difference in height between your vehicle and
the vehicle that enters the detection area
• Immediately after the BSM function is turned on

2834-5. Using the driving support systems
4
Driving
●Instances of the BSM function unnecessarily detecting a vehicle and/or
object may increase under the following conditions:
• When the sensor is misaligned due to a strong impact to the sensor or its
surrounding area
• When there is only a short distance between your vehicle and a guardrail,
wall, etc.
• When there is only a short distance between your vehicle and a following
vehicle
• When vehicle lanes are narrow and a vehicle driving 2 lanes across from
your vehicle enters the detection area
• When driving on roads with sharp bends, consecutive curves, or uneven
surfaces
• When items such as a bicycle carrier are installed on the rear of the vehi-
cle
The RCTA functions when your vehicle is in reverse. It can detect
other vehicles approaching from the right or left rear of the vehicle. It
uses radar sensors to alert the driver of the other vehicle’s existence
through flashing the outside rear view mirror indicators and sounding
a buzzer.
RCTA function
Approaching vehicles Detection areas12

3775-4. Other interior features
5
Interior features
The HomeLink® wireless control system in your vehicle has 3 buttons
which can be programmed to operate 3 different devices. Refer to the
programming methods on the following pages to determine the
method which is appropriate for the device.
HomeLink
® indicator light
Garage door operation indica-
tors
HomeLink
® icon
Illuminates while HomeLink® is
operating.
Buttons
■Before programming the HomeLink®
●During programming, it is possible that garage doors, gates, or
other devices may operate. For this reason, make sure that peo-
ple and objects are clear of the garage door or other devices to
prevent injury or other potential harm.
●It is recommended that a new battery be placed in the remote
control transmitter for more accurate programming.
●Garage door opener motors manufactured after 1995 may be
equipped with rolling code protection. If this is the case, you may
need a stepladder or other sturdy, safe device to reach the
“Learn” or “Smart” button on the garage door opener motor.
Garage door opener
: If equipped
The garage door opener can be programmed to operate garage
doors, gates, entry doors, door locks, home lighting systems,
security systems, and other devices.
HomeLink®
1
2
3
4

3956-2. Maintenance
6
Maintenance and care
Vehicle interior
ItemsCheck points
Accelerator pedal
• The accelerator pedal should
move smoothly (without uneven
pedal effort or catching).
Hybrid transmission “Park” mecha-
nism• When parked on a slope and the
shift lever is in P, is the vehicle
securely stopped?
Brake pedal
• Does the brake pedal move
smoothly?
• Does the brake pedal have appro-
priate clearance from the floor?
(P. 507)
• Does the brake pedal have the
correct amount of free play?
(P. 507)
Brakes
• The vehicle should not pull to one
side when the brakes are applied.
• The brakes should work effec-
tively.
• The brake pedal should not feel
spongy.
• The brake pedal should not get
too close to the floor when the
brakes are applied.
Head restraints (adjustable type)• Do the head restraints move
smoothly and lock securely?
Indicators/buzzers• Do the indicators and buzzers
function properly?
Lights • Do all the lights come on?
Parking brake
• Does the parking brake operate
normally?
• When parked on a slope and the
parking brake is on, is the vehicle
securely stopped?

4497-1. Essential information
7
When trouble arises
Steadily step on the brake pedal with both feet and firmly depress it.
Do not pump the brake pedal repeatedly as this will increase the effort
required to slow the vehicle.
Shift the shift lever to N.
If the shift lever is shifted to N
After slowing down, stop the vehicle in a safe place by the road.
Stop the hybrid system.
If the shift lever cannot be shifted to N
Keep depressing the brake pedal with both feet to reduce vehicle
speed as much as possible.
To stop the hybrid system,
press and hold the power
switch for 2 consecutive sec-
onds or more, or press it briefly
3 times or more in succession.
Stop the vehicle in a safe place by the road.
If your vehicle has to be stopped in an
emergency
Only in an emergency, such as if it becomes impossible to stop
the vehicle in the normal way, stop the vehicle using the follow-
ing procedure:
1
2
3
4
3
Press and hold for 2 seconds or
more, or press briefly 3 times or more
Q
WARNING
■If the hybrid system has to be turned off while driving
Power assist for the steering wheel will be lost, making the steering wheel
heavier to turn. Decelerate as much as possible before turning off the hybrid
system.
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