2021 TOYOTA PRIUS battery

921-4. Hybrid system
PRIUS_OM_OM47E09U_(U)
WARNING
■Road accident cautions
Observe the following precautions to reduce the risk of death o r serious
injury:
● Pull your vehicle off the road, apply the parking brake, shift the shift posi-
tion to P, and turn the hybrid system off.
● Do not touch the high voltage parts, cables and connectors.
● If electric wires are exposed inside or outside your vehicle, an electric
shock may occur. Never touch exposed electric wires.
● If a fire occurs in the hybrid vehicle, leave the vehicle as soon as possible.
Never use a fire extinguisher that is not meant for electric fires. Using even
a small amount of water may be dangerous.
● If your vehicle needs to be towed, do so with front wheels (2WD models)
or four wheels (AWD models) raised. If the wheels connected to the elec-
tric motor (traction motor) are on the ground when towing, the motor may
continue to generate electricity. This may cause a fire. ( P. 584)
● Carefully inspect the ground under the vehicle. If you find that liquid has
leaked onto the ground, the fuel system may have been damaged. Leave
the vehicle as soon as possible.
AWD models
● If a fluid leak occurs, do not touch the fluid as it may be str ong alkaline
electrolyte from the hybrid battery (traction battery). If it c omes into contact
with your skin or eyes, wash it off immediately with a large am ount of water
or, if possible, boric acid solution. Seek immediate medical attention.
2WD models
● Do not touch the battery if liquid is leaking from or adhering to it.
If electrolyte (carbonic-based organic electrolyte) from the hy brid battery
(traction battery) comes into contact with the eyes or skin, it could cause
blindness or skin wounds. In the unlikely event that it comes into contact
with the eyes or skin, wash it off immediately with a large amount of water,
and seek immediate medical attention.
● If electrolyte is leaking from the hybrid battery (traction bat tery), do not
approach the vehicle.
Even in the unlikely event that the hybrid battery (traction ba ttery) is dam-
aged, the internal construction of the battery will prevent a l arge amount of
electrolyte from leaking out. However, any electrolyte that doe s leak out
will give off a vapor. This vapor is an irritant to skin and eyes and could
cause acute poisoning if inhaled.
● Do not bring burning or high-tem perature items close to the electrolyte.
The electrolyte may ignite and cause a fire.

931-4. Hybrid system
PRIUS_OM_OM47E09U_(U)
1
For safety and security
WARNING
■Hybrid battery (traction battery)
● 2WD models: Your vehicle contains a sealed lithium-ion battery.
● Never resell, hand over or modify the hybrid battery. To preven t accidents,
hybrid batteries that have been removed from a disposed vehicle are col-
lected through Toyota dealer. Do not dispose of the battery yourself.
Unless the battery is properly collected, the following may occ ur, resulting
in death or serious injury:
• The hybrid battery may be illegally disposed of or dumped, and it is haz-
ardous to the environment or someone may touch a high voltage p art,
resulting in an electric shock.
• The hybrid battery is intended to be used exclusively with you r hybrid
vehicle. If the hybrid battery is used outside of your vehicle or modified
in any way, accidents such as electric shock, heat generation, smoke
generation, an explosion and electrolyte leakage may occur.
When reselling or handing over your vehicle, the possibility of an accident
is extremely high because the person receiving the vehicle may not be
aware of these dangers.
● If your vehicle is disposed of without the hybrid battery havin g been
removed, there is a danger of serious electric shock if high vo ltage parts,
cables and their connectors are touched. In the event that your vehicle
must be disposed of, the hybrid battery must be disposed of by your
Toyota dealer or a qualified service shop. If the hybrid battery is not dis-
posed of properly, it may cause electric shock that can result in death or
serious injury.

941-4. Hybrid system
PRIUS_OM_OM47E09U_(U)
NOTICE
■Hybrid battery (traction battery) air intake vent
● Make sure not to block the air intake vent with anything, such as a seat
cover, plastic cover, or luggage. If the vent is blocked, the charging/dis-
charging of the hybrid battery (traction battery) may become li mited.
● When dust etc. has accumulated in the air intake vent, clean it with a vac-
uum cleaner to prevent the vent from clogging.
● Do not get water or foreign materials in the air intake vent as this may
cause a short circuit and damage the hybrid battery (traction b attery).
● Do not carry large amounts of water such as water cooler bottle s in the
vehicle. If water spills onto the hybrid battery (traction batt ery), the battery
may be damaged. Have the vehicle inspected by your Toyota deale r.
● There is a filter installed to the air intake vent. When the fi lter remains
noticeably dirty even after cleaning the air intake vent, filte r cleaning or
replacement is recommended. For information regarding filter cl eaning or
replacement, refer to P. 551.
● If “Maintenance required for Traction battery cooling parts See owner’s
manual” is shown on the multi-information display, the air intake vent and
filter may be clogged. Refer to P. 551 for information on how to clean the
air intake vent.

PRIUS_OM_OM47E09U_(U)
1052. Instrument cluster
2
Instrument cluster
■When disconnecting and reconnecting 12-volt battery terminals
The settings of the clock will be reset.
■ Calendar settings
●Until the calendar settings are set, the check screen is displa yed every time
the power switch is turned to ON mode.
● After the calendar information is set, it can be changed in the “Meter Cus-
tomize” settings. ( P. 153)
■ When the menu screen on the navi gation system is operated (vehicles
with 11.6-inch display)
■ Liquid crystal display
Small spots or light spots may appear on the display. This phen omenon is
characteristic of liquid crystal displays, and there is no prob lem continuing to
use the display.
■ Pop-up display
Some functions, such as the driving mode select switch and air conditioning
system, are operation-linked and display pop-up screens on the multi-infor-
mation display. If the pop-up screens of these functions are not desired, they
can be turned off in the “Meter Customize” settings. ( P. 153)
If calendar recording is interrupted due to
replacement of the 12-volt battery or 12-
volt battery discharge, etc., when the
power switch is turned to ON mode after
maintenance, the calendar settings check
screen is automatically displayed on the
multi-information display.
●
If date information is not set, the fuel
consumption record cannot be stored
correctly. When the calendar settings
check screen is displayed, make sure to
always set the settings. ( P. 151)
A pop-up display of the menu screen icon
is displayed on the multi-information dis-
play.
*
*
: The pop-up display on the navigation
system can be turned off in the “Meter
Customize” settings. ( P. 153)

122
PRIUS_OM_OM47E09U_(U)
2. Instrument cluster
Vehicles without RSA (Road Sign Assist)
When split screen is selected for the main display, display con tents on
the sub-screen c an be selected.
Vehicles with RSA (Road Sign Assist)
When RSA is off, display contents on the sub-screen can be sele cted.
Press or of the meter
control switches and select the
sub-screen.
When the sub-screen is selected,
is displayed on the sub-
screen.
Press or of the meter control switches to select the display
item.
One of the following 3 items can be displayed.
Switching contents displayed on the sub-screen
1
2
Display contentsDetail
Hybrid System Indicator A convenient Hybrid System Indicator is displayed.
Refer to P. 129 for details on how to read the Hybrid
System Indicator.
Current fuel consumption
The current fuel consumption during driving is dis-
played.
• The mark indicates the value displayed in theaverage fuel consumption display ( P. 119).
Switching the average fuel consumption display
also changes the position of the mark.
• When the average fuel consumption is reset, the
position of the mark is reset to 0.
Hybrid battery (traction battery) status The same contents as the hybrid battery (traction
battery) status on the energy monitor are displayed.
(P. 128)

PRIUS_OM_OM47E09U_(U)
1272. Instrument cluster
2
Instrument cluster
◆Energy monitor
The energy monitor can be used to check the vehicle drive status,
hybrid system operation status and energy regeneration status.
When energy is flowing, an arrow appears and a bright point of light
moves to show the direction of the flow of energy. When energy is
not flowing, the bright point of light is not displayed.
Gasoline engine
Electric motor
(traction motor)
Hybrid battery
(traction battery)
Tire
Bright point of light showing
the flow of energy
As an example, all arrows are shown in the illustration, but the actual con-
tents of the display will differ.
(Display example)
●When the hybrid battery (traction battery) is being charged, th e
bright point of li ght moves towards .
● During driving, the bright point of light moves from or (or
both depending on the s ituation) towards .
*
●During driving, the image of the tires rotates.
*: The display may differ depending on the driving status.
1
2
3
4
5
3
12
4

128
PRIUS_OM_OM47E09U_(U)
2. Instrument cluster
■Hybrid battery (traction battery) status
●The display changes in 8 levels according to the remaining char ge amount
of the hybrid battery (traction battery).
● The hybrid battery (traction battery) status is also displayed on the following
screen, but the contents of the display are the same.
• Sub-screen of the main display ( P. 122)
• Hybrid System Indicator ( P. 129)
• Head-up display (if equipped) ( P. 158)
● The charge amount of the hybrid battery (traction battery) is automatically
controlled by the hybrid system. For this reason, even if electricity is recov-
ered via the regenerative braking, or electricity is generated via the gasoline
engine, the displayed hybrid battery (traction battery) charge amount may
not reach the highest level (level 8). However, this does not i ndicate a mal-
function.
■ Remaining charge amount warning of hybrid battery (traction battery)
●The buzzer sounds intermittently when the hybrid battery (traction battery)
remains without charging while the shift position is in N, or t he remaining
charge amount drops below a certain level.
If the remaining charge amount drops further, the buzzer sounds continu-
ously.
● When a warning message is shown on the multi-information display and the
buzzer sounds, follow the instructions displayed on the screen to perform
troubleshooting. Low
High
1
2

130
PRIUS_OM_OM47E09U_(U)
2. Instrument cluster
EV indicator*2, 3
The EV indicator comes on when the vehicle is driven using only the
electric motor (traction motor) or the gasoline engine is stopped.
Hybrid battery (traction battery) status
P. 128
Eco score
P. 131
● By keeping the indicator within Eco area, more Eco-friendly dri v-
ing can be achieved.
● Charge area indicates regeneration
*4 status. Regenerated
energy will be used to charge the hybrid battery (traction battery).
*1: Not displayed on the sub-screen.
*2: Not displayed on the sub-screen or head-up display.
*3: The EV indicator function can be turned off in the “Meter Cust omize”
settings. ( P. 153)
*4: When used in this manual, “regeneration” refers to the conversion of
energy created by the movement of the vehicle into electrical e nergy.
■
“ECO Accelerator Guidance”
A blue zone is displayed in the
Eco area which can be used as
a reference operation range for
using the accelerator pedal
according to driving conditions
such as starting off and cruis-
ing.
The “ECO Accelerator Guid-
ance” display changes accord-
ing to the driving status, such as
when starting off or cruising.
It is easier to drive in an Eco-friendly manner by driving according to the
display showing the accelerator pedal operations and staying wi thin the
“ECO Accelerator Guidance” range. ( P. 229)
The “ECO Accelerator Guidance” function can be turned off in the
“Meter Customize” settings. ( P. 153)
5
6
7
“ECO Accelerator Guidance”