Toyota Prius: Hybrid system precautions

When driving the 2024 Toyota Prius, it's essential to observe specific precautions related to its hybrid system for safety and optimal performance. This includes being aware of high-voltage components and avoiding unauthorized modifications or repairs to these parts, as they can pose a risk of electric shock or damage. Additionally, understanding the regenerative braking system's behavior and avoiding prolonged idling in "READY" mode can help maintain battery health and improve fuel efficiency. Towing precautions should also be observed to prevent damage to the hybrid components, ensuring the vehicle's longevity and safe operation in various driving conditions.

• System components
• Hybrid battery (traction battery) air intake vent

System components

Handle the hybrid system with extreme caution due to its high voltage nature, capable of reaching up to approximately 600V. Certain components within the system also generate significant heat during operation. Always follow the warning labels affixed to the vehicle to prevent potential hazards and ensure safe handling practices at all times. It is crucial to avoid contact with high-voltage components and refrain from unauthorized modifications or repairs to maintain personal safety and preserve the integrity of the hybrid system.

System components

The illustration is an example for explanation and may differ from the actual item.

1. Warning label
2. Service plug
3. Rear electric motor (traction motor) (AWD models)
4. Hybrid battery (traction battery)
5. High voltage cables (orange)
6. Front electric motor (traction motor)
7. Power control unit
8. Air conditioning compressor

Running out of fuel

In the event that the 2024 Toyota Prius runs out of fuel and the hybrid system cannot start, it is essential to refuel the vehicle with a sufficient amount of gasoline to extinguish the low fuel level warning light. If only a small amount of fuel is added, the hybrid system may not have adequate fuel to initiate startup. Ensuring the tank is adequately filled is crucial to enable the hybrid system to operate effectively and avoid potential starting issues due to low fuel levels. (The standard amount of fuel is about 2.3 gal. [8.8 L, 1.9 Imp.gal., when the vehicle is on a level surface. This value may vary when the vehicle is on a slope. Add extra fuel when the vehicle is inclined.)

Electromagnetic waves

• High voltage parts and cables on Hybrid Electric Vehicles incorporate electromagnetic shielding, and therefore emit approximately the same amount of electromagnetic waves as conventional gasoline powered vehicles or home electronic appliances.
• Your vehicle may cause sound interference in some third partyproduced radio parts.

Hybrid battery (traction battery)

The hybrid battery, also known as the traction battery, in the 2024 Toyota Prius has a finite service life that can vary based on individual driving habits and environmental conditions. Factors such as driving style, frequency of use, temperature extremes, and overall maintenance practices can influence the longevity of the hybrid battery. It is important for Prius owners to be mindful of these factors and follow recommended maintenance schedules to optimize the battery's lifespan. Regularly monitoring battery health indicators and addressing any issues promptly can help ensure reliable performance from the hybrid battery throughout its service life.

Starting the hybrid system in an extremely cold environment

When the hybrid battery (traction battery) is extremely cold (below approximately -22ºF [-30ºC]) 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.

WARNING

High voltage precautions

This vehicle has high voltage DC and AC systems as well as a 12- volt system. DC and AC high voltage is very dangerous and can cause severe burns and electric shock that may result in death or serious injury.

• Never touch, disassemble, remove or replace the high voltage parts, cables or their connectors.
• The hybrid system will become hot after starting as the system uses high voltage. Be careful of both the high voltage and the high temperature, and always obey the warning labels attached to the vehicle.
• Never try to open the service plug access hole located underneath the rear seats. The service plug is used only when the vehicle is serviced and is subject to high voltage.

 

Road accident cautions

Observe the following precautions to reduce the risk of death or serious injury:

• Stop the vehicle in a safe place to prevent subsequent accidents.

  While depressing the brake pedal, apply the parking brake and shift the shift position to P to stop the hybrid system.

  Then, slowly release the brake pedal.

WARNING

• 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.

• Do not touch the battery if liquid is leaking from or adhering to it.

  If electrolyte (carbonic-based organic electrolyte) from the hybrid 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 battery), do not approach the vehicle.

  Even in the unlikely event that the hybrid battery (traction battery) is damaged, the internal construction of the battery will prevent a large amount of electrolyte from leaking out. However, any electrolyte that does 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 hightemperature items close to the electrolyte.

  The electrolyte may ignite and cause a fire.

• If a fire occurs in the Hybrid Electric 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 four wheels raised. If the wheels connected to the electric motor (traction motor) are on the ground when towing, the motor may continue to generate electricity. This may cause a fire.
• 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.

Hybrid battery (traction battery)

• Your vehicle contains a sealed lithium-ion battery.
• Never resell, hand over or modify the hybrid battery. To prevent accidents, hybrid batteries that have been removed from a disposed vehicle are collected through Toyota dealer. Do not dispose of the battery yourself.

Unless the battery is properly collected, the following may occur, resulting in death or serious injury:

• The hybrid battery may be illegally disposed of or dumped, and it is hazardous to the environment or someone may touch a high voltage part, resulting in an electric shock.
• The hybrid battery is intended to be used exclusively with your Hybrid Electric 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.

WARNING

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 having been removed, there is a danger of serious electric shock if high voltage 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 disposed of properly, it may cause electric shock that can result in death or serious injury.

NOTICE

Hybrid battery (traction battery)

• Do not carry large amounts of water such as water cooler bottles in the vehicle. If water spills onto the hybrid battery (traction battery), the battery may be damaged.

  Have the vehicle inspected by your Toyota dealer.

Hybrid battery (traction battery) air intake vent

The Toyota Prius hybrid battery (traction battery) is equipped with an air intake vent to help regulate its temperature and ensure optimal performance and longevity. This vent allows for the circulation of air around the battery pack, helping to dissipate heat generated during operation and maintain a stable temperature range. By facilitating proper ventilation, the air intake vent contributes to the efficient operation and longevity of the hybrid battery, ensuring it operates effectively under various driving conditions and environmental factors. Regular inspection and maintenance of the vent are recommended to ensure it remains clear and functioning correctly to support the overall performance of the hybrid system.

There is an air intake vent under the left side of the rear seat with the purpose of cooling the hybrid battery (traction battery).

If the vent is blocked, it may interfere with the cooling of the hybrid battery (traction battery).

If input/output of the hybrid battery battery (traction battery) becomes limited and the distance that the vehicle can be driven using the electric motor (traction motor) is reduced, the fuel economy may be reduced.

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.

  The input/output of the hybrid battery (traction battery) may be restricted, leading to a reduction in hybrid battery (traction battery) output and a malfunction.

• Periodically clean the air intake vent to prevent it 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 battery).
• There is a filter installed to the air intake vent. When the filter remains noticeably dirty even after cleaning the air intake vent, filter cleaning or replacement is recommended. For information regarding filter cleaning or replacement
• 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  for information on how to clean the air intake vent.

Emergency shut off system

When the impact sensor detects a significant impact, the emergency shut-off system in the Toyota Prius activates as a safety measure. This system immediately blocks the high-voltage current and stops the fuel pump to prevent potential hazards such as electrocution and fuel leakage. If this emergency shut-off system is triggered, the vehicle will not be able to restart on its own. To safely restart the hybrid system, it is crucial to contact your Toyota dealer for assistance. They can assess the situation, reset the system if necessary, and ensure that the vehicle is safe to operate again. Prompt action ensures the continued safety and reliability of the Toyota Prius following such events.

Hybrid warning message

In the Toyota Prius, a hybrid warning message will automatically appear on the multi-information display if a malfunction occurs within the hybrid system or if there is an attempt at improper operation. It is essential to read the message carefully and follow any instructions provided. These warnings are designed to alert drivers to potential issues that could affect the vehicle's performance or safety. Responding promptly to these messages by consulting the owner's manual or contacting a Toyota dealer for assistance can help diagnose and resolve any problems, ensuring continued safe operation of the Prius' hybrid system..

If a warning message is shown on the multi-information display, read the message and follow the instructions.

If a warning light comes on, a warning message is displayed, or the 12-volt battery is disconnected

The hybrid system may not start. In this case, try to start the system again. If the "READY" indicator does not come on, contact your Toyota dealer.