battery TOYOTA PRIUS 2022 Manual Online

6047-2. Steps to take in an emergency
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If “Shifted into Shift Again to Start Vehicle” is shown
Message is displayed when the automatic P position selection function oper-
ates. ( P. 252)
To start off the vehicle after the shift position is changed to P, operate the shift
lever again.
■ If “Shift to Before Exiting Vehicle” is shown
Message is displayed when the driver’s door is opened without t urning the
power switch to off with the shift position in any position oth er than P.
Shift the shift position to P.
■ If “Shift is in Release Accelerat or Before Shifting” is shown
Message is displayed when the accelerator pedal has been depressed and
the shift position is in N.
Release the accelerator pedal and shift the shift position to D or R.
■ If “Depress Brake When Vehicle is Stopped. Hybrid System may Ov er-
heat.” is shown
The message may be shown when the accelerator pedal is depresse d to hold
the vehicle while the vehicle is stopped on an uphill, etc.
The hybrid system may overheat. Release the accelerator pedal a nd depress
the brake pedal.
■ If “Shifted to Stop Vehicle to Shift to ” is shown
If the P position switch is pressed while driving, the shift po sition is changed
to N and the message is shown. ( P. 251)
■ If “Auto Power OFF to Conserve Battery” is shown
The power switch has been turned off by the automatic power off function.
When starting the hybrid system next time, operate the hybrid s ystem for
approximately 5 minutes to recharge the 12-volt battery.
■ If “Engine Oil Level Low Add or Replace” is displayed
The engine oil level may be low. Check the level of the engine oil, and add
engine oil if necessary. This message may be displayed if the vehicle is
stopped on a slope. Move the vehicle to a level surface and che ck if the mes-
sage disappears.
■ If “Accelerator and Brake Pedals Pressed Simultaneously” is sho wn
The accelerator and brake pedals are being depressed simultaneo usly.
( P. 223)
Release the accelerator pedal and depress the brake pedal.

6067-2. Steps to take in an emergency
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If the shift position cannot be changed or the power switch is turned to
ACCESSORY mode even if trying to turn the power switch off when a
warning message is shown
If the 12-volt battery is discharged or the shift control system is malfunction-
ing, the followings may occur.
● The shift position may not be changed to P.
When parking, stop the vehicle on level ground and apply the parking brake
firmly.
● The hybrid system may not start.
● The power switch may be turned to ACCESSORY mode even if trying to
turn the power switch off.
In this case, the power switch may be turned off after applying the parking
brake.
● The automatic P position selection function ( P. 252) may not operate.
Before turning the power switch off, be sure to press the P position switch
and check that the shift position is in P by the shift position indicator or P
position switch indicator.
■ Warning buzzer
P. 595
NOTICE
■If “Maintenance Required for Traction Battery at Your Dealer” is shown
The hybrid battery (traction battery) is scheduled to be inspected or
replaced. Have the vehicle inspected by your Toyota dealer immediately.
● Continuing to drive the vehicle without having the hybrid batte ry (traction
battery) inspected will cause the hybrid system not to start.
● If the hybrid system does not start, contact your Toyota dealer immedi-
ately.

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When trouble arises
7-2. Steps to take in an emergency
If the hybrid system will not start
One of the following may be the cause of the problem:
● The electronic key may no t be functioning properly.
* ( P. 643)
● There may not be sufficient f uel in the vehicle’s tank.
Refuel the vehicle. ( P. 91)
● There may be a malfunction in the immobilizer system.
* ( P. 9 6 )
● There may be a malfunction i n the shift control system.
*
(  P. 243, 606)
● The hybrid system may be malfunc tioning due to an electrical prob-
lem such as electronic key battery depletion or a blown fuse. H ow-
ever, depending on the type of malfunction, an interim measure is
available to start the hybrid system. ( P. 642)
● There is a possibility that the t emperature of the hybrid battery
(traction battery) is extremely low (approximately below -22°F
[-30°C]). ( P. 91, 242)
*: It may not be possible to shift the shift position other than P.
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( P. 646)
● The 12-volt battery terminal connections may be loose or corrod ed.
(  P. 520)
Reasons for the hybrid system not starting vary depending on
the situation. Check the followi ng and perform the appropriate
procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( P. 239)
The interior lights and headlights are dim, or the horn does no t
sound or sounds at a low volume.

6427-2. Steps to take in an emergency
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One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( P. 646)
● One or both of the 12-volt battery terminals may be disconnecte d.
(  P. 520)
Contact your Toyota dealer if the problem cannot be repaired, o r if repair
procedures are unknown.
When the hybrid system does not start, the following steps can be
used as an interim measure to sta rt the hybrid system if the power
switch is functioning normally.
Do not use this starting procedur e except in cases of emergency.
Set the parking brake.
Turn the power switch to ACCESSORY mode.
Press and hold the power switch for about 15 seconds while
depressing the brake pedal firmly.
Even if the hybrid system can be started using the above steps, the
system may be malfunctioning. Hav e the vehicle inspected by your
Toyota dealer.
The interior lights and headlights do not turn on, or the horn
does not sound.
Emergency start function
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643
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When trouble arises
7-2. Steps to take in an emergency
If the electronic key does not operate
properly
Use the mechanical key (P. 177) in order to perform the following
operations:
Locks all the doors
Closes the windows and moon
roof
*1 (turn and hold)*2
Unlocks the door
Turning the key rearward unlocks
the driver’s door. Turning the key
once again within 3 seconds
unlocks the other doors.
Opens the windows and moon roof*1 (turn and hold)*2
*1: If equipped
*2: This setting must be customized at your Toyota dealer. ( P. 686)
If communication between the electronic key and vehicle is
interrupted ( P. 194) or the electronic key cannot be used
because the battery is depleted, the smart key system and
wireless remote control can not be used. In such cases, the
doors can be opened and the hybrid system can be started by
following the procedure below.
Locking and unlocking the doors
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6457-2. Steps to take in an emergency
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7
When trouble arises
■Stopping the hybrid system
Set the parking brake, shift the shift position to P and press the power switch
as you normally do when stopping the hybrid system.
■ 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. 555)
■ Changing power switch modes
Release the brake pedal and press the power switch in step above. The
hybrid system does not start and modes will be changed each time the switch
is pressed. ( P. 241)
■ When the electronic key does not work properly
●Make sure that the smart key system has not been deactivated in the cus-
tomization setting. If it is off, turn the function on.
(Customizable features: P. 686)
● Check if battery-saving mode is set. If it is set, cancel the f unction.
( P. 194)
WARNING
■ When using the mechanical key and operating the power windows or
moon roof (if equipped)
Operate the power window or moon roof after checking to make su re that
there is no possibility of any passenger having any of their body parts
caught in the window or moon roof.
Also, do not allow children to operate the mechanical key. It is possible for
children and other passengers to get caught in the power window or moon
roof.
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7-2. Steps to take in an emergency
If the 12-volt batter y is discharged
If you have a set of jumper (or booster) cables and a second vehicle
with a 12-volt battery, you can jump start your vehicle by foll owing the
steps below.
Open the hood. ( P. 5 1 1 )
Remove the engine cover.
Pull up the both ends of the cover
vertically.
The following procedures may be used to start the hybrid sys-
tem if the vehicle’s 12-volt battery is discharged.
You can also call your Toyota de aler or a qualified repair shop.
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6477-2. Steps to take in an emergency
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When trouble arises
Connect the jumper cables according to the following procedure:Connect a positive jumper cable clamp to the positive (+) batte ry
terminal on your vehicle.
Connect the clamp on the other end of the positive cable to the
positive (+) battery termi nal on the second vehicle.
Connect a negative cable clamp to the negative (-) battery term i-
nal on the s econd vehicle.
Connect the clamp at the other e nd of the negative cable to a
solid, stationary, unpainted metallic point away from the 12-vo lt
battery and any movin g parts, as shown in the illustration.
Start the engine of the second v ehicle. Increase the engine speed
slightly and maintain at that lev el for approximately 5 minutes to
recharge the 12-volt battery of your vehicle.
Maintain the engine speed of the second vehicle and start the
hybrid system of your vehicle by turning the power switch to ON
mode.
Make sure the “READY” indicator comes on. If the indicator ligh t
does not come on, contac t your Toyota dealer.3
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6487-2. Steps to take in an emergency
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Once the hybrid system has started, remove the jumper cables in
the exact reverse order from which they were connected.
To install the engine cover, conduct the removal procedure in
reverse. After installing, check that the fixed pins are inserted
securely.
Once the hybrid system starts, have the vehicle inspected at yo ur
Toyota dealer as soon as possible.
■ When opening the cover of the positive (+) battery terminal
P. 521
■ 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 s ystem 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 batt ery is
depleted, have the vehicle inspected at your Toyota dealer.
● Some systems may require initialization. ( P. 697)
■ When removing the 12-vo lt 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 gr adually even when
the vehicle is not in use, due to natural discharge and the dra ining effects of
certain electrical appliances. If the vehicle is left for a lon g time, the 12-volt
battery may discharge, and the hybrid system may be unable to s tart. (The
12-volt battery recharges automatically while the hybrid system is operating.)
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6497-2. Steps to take in an emergency
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When trouble arises
■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 wire less 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.
● If the 12-volt battery discharges while the shift position is in P, it may not be
possible to shift the shift position to other positions. In thi s case, the vehicle
cannot be towed without lifting both front wheels because the f ront wheels
will be locked. ( P. 580)
■ When replacing the 12-volt battery
●Use a 12-volt battery that conforms to European regulations.
● Use a 12-volt battery that the case size is same as the previou s one (LN1),
20 hour rate capacity (20HR) is equivalent (45Ah) or greater, and perfor-
mance rating (CCA) is equivalent (295A) or greater.
• If the sizes differ, the 12-volt battery cannot be properly se cured.
• If the 20 hour rate capacity is low, even if the time period w here the vehi-
cle is not used is a short time, the 12-volt battery may discharge and the
hybrid system may not be able to start.
● For details, consult your Toyota dealer.