Toyota Prius Prime (2020 year). Owner's manual — part 44

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8-2. Steps to take in an emergency

NOTICE

■

To avoid damage to the tire pressure warning valves and transmit-

ters
When a tire is repaired with liquid sealants, the tire pressure warning

valve and transmitter may not operate properly. If a liquid sealant is

used, contact your Toyota dealer or other qualified service shop as soon

as possible. After use of liquid sealant, make sure to replace the tire

pressure warning valve and transmitter when repairing or replacing the

tire. (

P. 603)

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8-2. 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 charging cable may be attached to the vehicle. (P. 146)
● The electronic key may not be functioning properly.

*

(

P. 699)

● There may not be sufficient fuel in the vehicle’s tank.

Refuel the vehicle. (

P. 100)

● There may be a malfunction in the immobilizer system.

*

(

P. 83)

● There may be a malfunction in the shift control system.

*

(

P. 339, 678)

● The hybrid system may be malfunctioning due to an electrical prob-

lem such as electronic key battery depletion or a blown fuse. How-
ever, depending on the type of malfunction, an interim measure is
available to start the hybrid system. (

P. 698)

● There is a possibility that the temperature of the hybrid battery

(traction battery) is extremely low (approximately below -22°F
[-30°C]). (

P. 100, 338)

*

: 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. 703)
● The 12-volt battery terminal connections may be loose or corroded.

(

P. 595)

Reasons for the hybrid system not starting vary depending on
the situation. Check the following and perform the appropriate
procedure:

The hybrid system will not start even though the correct starting
procedure is being followed. (

P. 336)

The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.

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8-2. Steps to take in an emergency

One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. (P. 703)
● One or both of the 12-volt battery terminals may be disconnected.

(

P. 595)

Contact your Toyota dealer if the problem cannot be repaired, or if repair
procedures are unknown.

When the hybrid system does not start, the following steps can be
used as an interim measure to start the hybrid system if the power
switch is functioning normally.
Do not use this starting procedure 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. Have 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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8-2. Steps to take in an emergency

If the electronic key does not operate

properly

Use the mechanical key (

P. 275) in order to perform the following

operations:

Locks all the doors
Closes the windows
(turn and hold)

*

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
(turn and hold)

*

*

: This setting must be customized at your Toyota dealer. (

P. 741)

If communication between the electronic key and vehicle is
interrupted (

P. 293) or the electronic key cannot be used

because the battery is depleted, the smart key system and
wireless remote control cannot 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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8-2. Steps to take in an emergency

Depress the brake pedal.
Touch the Toyota emblem side
of the electronic key to the
power switch.

When the electronic key is
detected, a buzzer sounds and the
power switch will turn to ON mode.
When the smart key system is
deactivated in customization set-
ting, the power switch will turn to
ACCESSORY mode.

Firmly depress the brake pedal

and check that

is shown

on the multi-information display.

Press the power switch.

In the event that the hybrid system still cannot be operated, contact
your Toyota dealer.

Starting the hybrid system

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8-2. Steps to take in an emergency

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Locking the charging port lid

Close the charging port lid. (

P. 112)

Lock the doors using the mechanical key. (

P. 699)

The charging port lid can be locked if the steps and are performed
in reverse.

■

Unlocking the charging port lid

Unlock the doors using the mechanical key. (

P. 699)

Open the charging port lid. (

P. 111)

*

: Vehicles with smart lid & connector locking system only

■

Locking the charging connector

Unlock the doors using the mechanical key. (

P. 699)

Open the charging port lid. (

P. 111)

Insert the charging connector into the charging inlet. (

P. 147)

Push the charging connector lock switch. (

P. 148)

The charging connector will be locked.

■

Unlocking the charging port lid

Unlock the doors using the mechanical key. (

P. 699)

Push the charging connector lock switch. (

P. 150)

The charging connector will be unlocked.

*

: Vehicles with smart lid & connector locking system only

Locking and unlocking the charging port lid

*

Locking and unlocking the charging connector

*

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8-2. Steps to take in an emergency

■

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. 635)

■

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. 338)

■

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. 741)

●

Check if battery-saving mode is set. If it is set, cancel the function.
(

P. 292)

WARNING

■

When using the mechanical key and operating the power windows
Operate the power window after checking to make sure that there is no pos-
sibility of any passenger having any of their body parts caught in the win-
dow.
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.

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8-2. Steps to take in an emergency

If the 12-volt battery 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 following the
steps below.

Open the hood. (

P. 585)

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 dealer or a qualified repair shop.

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8-2. Steps to take in an emergency

Connect the jumper cables according to the following procedure:

Connect a positive jumper cable clamp to the positive (+) battery
terminal on your vehicle.
Connect the clamp on the other end of the positive cable to the
positive (+) battery terminal on the second vehicle.
Connect a negative cable clamp to the negative (-) battery termi-
nal on the second vehicle.
Connect the clamp at the other end of the negative cable to a
solid, stationary, unpainted metallic point away from the 12-volt
battery and any moving parts, as shown in the illustration.

Start the engine of the second vehicle. Increase the engine speed
slightly and maintain at that level 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 light
does not come on, contact your Toyota dealer.
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 your
Toyota dealer as soon as possible.

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8-2. Steps to take in an emergency

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When opening the cover of the positive (+) battery terminal
P. 595

■

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. 752)

■

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.)

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8-2. Steps to take in an emergency

■

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.

●

Vehicles with smart lid & connector locking system:
It may be impossible to unlock the charging port lid or locking and unlocking
the charging connector immediately after the 12-volt battery is reconnected.
In this case, carry the electronic key on your person and operate the
charging port lid or charging connector lock switch again.

●

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 this case, the vehicle
cannot be towed without lifting both front wheels because the front wheels
will be locked. (

P. 655)

■

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 previous 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 secured.
• If the 20 hour rate capacity is low, even if the time period where 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.

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8-2. Steps to take in an emergency

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WARNING

■

When removing the 12-volt battery terminals
Always remove the negative (-) terminal first. If the positive (+) terminal con-
tacts any metal in the surrounding area when the positive (+) terminal is
removed, a spark may occur, leading to a fire in addition to electrical shocks
and death or serious injury.

■

Avoiding 12-volt battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flam-
mable gas that may be emitted from the 12-volt battery:

●

Make sure each jumper cable is connected to the correct terminal and that
it is not unintentionally in contact with any other than the intended terminal.

●

Do not allow the other end of the jumper cable connected to the “+” termi-
nal to come into contact with any other parts or metal surfaces in the area,
such as brackets or unpainted metal.

●

Do not allow the + and - clamps of the jumper cables to come into contact
with each other.

●

Do not smoke, use matches, cigarette lighters or allow open flame near
the 12-volt battery.

■

12-volt battery precautions
The 12-volt battery contains poisonous and corrosive acidic electrolyte,
while related parts contain lead and lead compounds. Observe the following
precautions when handling the 12-volt battery:

●

When working with the 12-volt battery, always wear safety glasses and
take care not to allow any battery fluids (acid) to come into contact with
skin, clothing or the vehicle body.

●

Do not lean over the 12-volt battery.

●

In the event that battery fluid comes into contact with the skin or eyes,
immediately wash the affected area with water and seek medical attention.
Place a wet sponge or cloth over the affected area until medical attention
can be received.

●

Always wash your hands after handling the 12-volt battery support, termi-
nals, and other battery-related parts.

●

Do not allow children near the 12-volt battery.

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8-2. Steps to take in an emergency

NOTICE

■

When handling jumper cables
When connecting the jumper cables, ensure that they do not become entan-
gled in the cooling fans, etc.

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8-2. Steps to take in an emergency

If your vehicle overheats

■

If the high coolant temperature warning light comes on or
flashes

Stop the vehicle in a safe place and turn off the air conditioning
system, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has cooled down sufficiently, inspect the
hoses and radiator core (radiator) for any leaks.

Radiator
Cooling fans

If a large amount of coolant
leaks, immediately contact
your Toyota dealer.

The following may indicate that your vehicle is overheating.

● The high coolant temperature warning light (P. 664) comes on

or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle speed does not increase.)

● “Hybrid System Overheated” is shown on the multi-information

display.

● Steam comes out from under the hood.

Correction procedures

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8-2. Steps to take in an emergency

The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.

Reservoir
“FULL” line
“LOW” line

Add coolant if necessary.

Water can be used in an emer-
gency if coolant is unavailable.

Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fans operate and to check for
coolant leaks from the radiator or hoses.

The fans operate when the temperature setting is adjusted to “LO” and

“A/C” switch (

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) is turned on immediately after a

cold start. Confirm that the fans are operating by checking the fan sound
and air flow. If it is difficult to check these, turn the “A/C” switch

(

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) on and off repeatedly. (The fans may not

operate in freezing temperatures.)

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: Vehicles with 7-inch display

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: Vehicles with 11.6-inch display

If the fans are not operating:
Stop the hybrid system immediately and contact your Toyota
dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Toyota dealer.

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8-2. Steps to take in an emergency

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If “Hybrid System Overheated” is shown on the multi-informa-
tion display

Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has cooled down, inspect the hoses and
radiator core (radiator) for any leaks.

Radiator
Cooling fans

If a large amount of coolant
leaks, immediately contact
your Toyota dealer.

The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.

Reservoir
“FULL” line
“LOW” line

Add coolant if necessary.

Water can be used in an emer-
gency if coolant is unavailable.
If water was added in an emer-
gency, have the vehicle inspected
at your Toyota dealer as soon as
possible.

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