Get Steps to take in an emergency -> If the 12-volt battery is discharged Guide for Toyota Prius 4 Door Fourth Generation (2016-2022)

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7-2. Steps to take in an emergency

If the 12-volt battery is discharged

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.

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.

1

Open the hood. (P. 503)

2

Remove the engine cover.

Pull up the both ends of the cover

vertically.

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7-2. Steps to take in an emergency

3

Connect the jumper cables according to the following procedure:

1

Connect a positive jumper cable clamp to the positive (+) battery

terminal on your vehicle.

2

3

4

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.

4

1

2

3

7

4

5

6

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.

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7-2. Steps to take in an emergency

7

Once the hybrid system has started, remove the jumper cables in

the exact reverse order from which they were connected.

8

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.

■When opening the cover of the positive (+) battery terminal

P. 513

■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. 688)

■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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7-2. 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.

●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. 572)

■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.

7

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7-2. Steps to take in an emergency

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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7-2. 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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Steps to take in an emergency -> If the 12-volt battery is discharged for Your Toyota Prius 4 Door Fourth Generation (2016-2022)

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