Motor compartment Components Heater coolant reservoir (Checking the heater coolant) Washer fluid tank (Adding the washer fluid) Power control unit coolant reservoir (Checking the power control unit coolant) 12-volt battery (Checking the 12-volt battery) Brake fluid reservoir (Checking and adding the brake fluid) Fuse box (Checking and replacing fuses) Radiator (Checking the radiator and condenser) Condenser (Checking the radiator and condenser) Electric cooling fan Coolant Checking Heater coolant Checking Checking the heater coolant The coolant level is satisfactory if it is between the “ MAX” and “ MIN” lines on the reservoir when the EV system is cold. Reservoir cap “ MAX” line “ MIN” line If the level is on or below the “ MIN” line, add coolant up to the “ MAX” line. (If your vehicle overheats) Note: Coolant selection Only use “ Toyota Super Long Life Coolant” or a similar high quality ethylene glycol-based non-silicate, non-amine, non-nitrite, and nonborate coolant with long-life hybrid organic acid technology. “ Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deionized water. (Minimum temperature: -31°F [-35°C]) For more details about coolant, contact your Toyota dealer. If the coolant level drops within a short time of replenishing Visually check the radiator, hoses, power control unit coolant reservoir caps, drain cock and water pump. If you cannot find a leak, have your Toyota dealer, test the cap and check for leaks in the cooling system. Warning: When the heater system is hot Do not remove the heater coolant reservoir caps. The heater system may be under pressure and may spray hot coolant if the cap is removed, causing serious injuries, such as burns. Notice: When adding coolant Coolant is neither plain water nor straight antifreeze. The correct mixture of water and antifreeze must be used to provide proper lubrication, corrosion protection and cooling. Be sure to read the antifreeze or coolant label. If you spill coolant Be sure to wash it off with water to prevent it from damaging parts or paint. Radiator CondenserChecking the radiator and condenser Check the radiator and condenser and clear away any foreign objects. If either of the above parts is extremely dirty or you are not sure of their condition, have your vehicle inspected Toyota dealer. Warning: When the EV system is hot Do not touch the radiator or condenser as they may be hot and cause serious injuries, such as burns. When the electric cooling fan are operating Do not touch the motor compartment. With the power switch in ON, the electric cooling fan may automatically start to run if the air conditioning is on and/or the coolant temperature is high. Be sure the power switch is OFF when working near the electric cooling fan or radiator grille. Power control unit coolant Checking Coolant Checking Checking the power control unit coolant The coolant level is satisfactory if it is between the “ MAX” and “ MIN” lines on the reservoir when the EV system is cold. Reservoir cap “ MAX” line “ MIN” line If the level is on or below the “ MIN” line, add coolant up to the “ MAX” line. Note: Coolant selection In order to ensure maximum performance of the traction battery cooling system and limit risks of battery short circuit and other damage to your vehicle, Toyota recommends using “Toyota Genuine Traction Battery Coolant” or similar high-quality ethylene glycol-based, low electric conductivity coolant, non-amine and non-borate coolant with azole additives. Toyota cannot guarantee that the use of a product other than “Toyota Genuine Traction Battery Coolant” will prevent risks of battery short circuit or other damage. Never use water as it will cause damage. Do not reuse coolant that has been removed from the radiator. For more details about coolant, contact your Toyota dealer. If the coolant level drops within a short time of replenishing Visually check the hoses, heater coolant reservoir caps, drain cock and water pump. If you cannot find a leak, have your Toyota dealer, test the cap and check for leaks in the cooling system. Warning: When the EV system is hot Do not remove the power control unit coolant reservoir caps. The cooling system may be under pressure and may spray hot coolant if the cap is removed, causing serious injuries, such as burns. Notice: When adding coolant Coolant is neither plain water nor straight antifreeze. The correct mixture of water and antifreeze must be used to provide proper lubrication, corrosion protection and cooling. Be sure to read the antifreeze or coolant label. If you spill coolant Be sure to wash it off with water to prevent it from damaging parts or paint. Brake Fluid Checking and adding the brake fluid Checking fluid level The brake fluid level should be between the “ MAX” and “ MIN” lines on the tank. Reservoir cap “ MAX” line “ MIN” line Adding fluid Make sure to check the fluid type and prepare the necessary item. Fluid type FMVSS No.116 DOT 3 or SAE J1703 brake fluid FMVSS No.116 DOT 4 or SAE J1704 brake fluid Item Clean funnel Note: Brake fluid can absorb moisture from the air Excess moisture in the brake fluid can cause a dangerous loss of braking efficiency. Use only newly opened brake fluid. Warning: When filling the reservoir Take care as brake fluid can harm your hands and eyes and damage painted surfaces. If fluid gets on your hands or in your eyes, flush the affected area with clean water immediately. If you still experience discomfort, see a doctor. Notice: If the fluid level is low or high It is normal for the brake fluid level to go down slightly as the brake pads wear out or when the fluid level in the accumulator is high. If the reservoir needs frequent refilling, there may be a serious problem. Battery (12-volt battery) Battery checking Battery (12-volt battery)Checking the 12-volt battery Check the 12-volt battery as follows. 12-volt battery exterior Make sure that the 12-volt battery terminals are not corroded and that there are no loose connections, cracks, or loose clamps. Terminals Hold-down clamp Checking 12-volt battery fluid Check that the level is between the “ UPPER LEVEL” and “ LOWER LEVEL” lines. “ UPPER LEVEL” line “ LOWER LEVEL” line If the fluid level is at or below the “ LOWER LEVEL” line, add distilled water. Adding distilled water Remove the vent plug. Add distilled water. If the “ UPPER LEVEL” cannot be seen, check the fluid level by looking directly at the cell. Put the vent plug back on and close it securely. Note: Before recharging When recharging, the 12-volt battery produces hydrogen gas which is flammable and explosive. Therefore, observe the following precautions before recharging: If recharging with the 12-volt battery installed on the vehicle, be sure to disconnect the ground cable. Make sure the power switch on the charger is off when connecting and disconnecting the charger cables to the 12-volt battery. After recharging/reconnecting the 12-volt battery The EV system may not start. Follow the procedure below to initialize the system. Shift the shift position to P. Open and close any of the doors. Restart the EV system. Unlocking the doors using the Smart key system may not be possible immediately after reconnecting the 12-volt battery. If this happens, use the wireless remote control or the mechanical key to lock/unlock the doors. Start the EV system with the power switch in ACC. The EV system may not start with the power switch turned off. However, the EV system will operate normally from the second attempt. The power switch mode is recorded by the vehicle. If the 12-volt battery is disconnected and reconnected, the vehicle will return the power switch mode to the status it was in before the 12-volt battery was disconnected. Make sure to turn off the power switch before disconnecting the 12-volt battery. Take extra care when connecting the 12-volt battery if the power switch mode prior to the 12-volt battery being disconnected is unknown. If the EV system will not start even after multiple attempts at all the methods above, contact your Toyota dealer. Warning: Chemicals in the 12-volt battery Batteries contain poisonous and corrosive sulfuric acid and may produce hydrogen gas which is flammable and explosive. To reduce the risk of death or serious injury, take the following precautions while working on or near the 12-volt battery: Do not cause sparks by touching the 12-volt battery terminals with tools. Do not smoke or light a match near the 12-volt battery. Avoid contact with eyes, skin and clothes. Never inhale or swallow electrolyte. Wear protective safety glasses when working near the 12-volt battery. Keep children away from the 12-volt battery. Where to safely charge the 12-volt battery Always charge the 12-volt battery in an open area. Do not charge the 12-volt battery in a garage or closed room where there is insufficient ventilation. Emergency measures regarding electrolyte If electrolyte gets in your eyesFlush your eyes with clean water for at least 15 minutes and get immediate medical attention. If possible, continue to apply water with a sponge or cloth while traveling to the nearest medical facility. If electrolyte gets on your skinWash the affected area thoroughly. If you feel pain or burning, get medical attention immediately. If electrolyte gets on your clothesIt can soak through clothing on to your skin. Immediately take off the clothing and follow the procedure above if necessary. If you accidentally swallow electrolyteDrink a large quantity of water or milk. Get emergency medical attention immediately. When there is insufficient 12-volt battery fluid Do not use if there is insufficient fluid in the 12-volt battery. There is a possible danger that the 12-volt battery may explode. Notice: When recharging the 12-volt battery Never recharge the 12-volt battery while the EV system is operating. Also, be sure all accessories are turned off. When adding distilled water Avoid overfilling. Water spilled during 12-volt battery recharging may cause corrosion. Fluid Washer Washer Low washer fluid warning message Adding the washer fluid If any washer does not work or the warning message appears on the multi-information display, the washer tank may be empty.Add washer fluid. Warning: When adding washer fluid Do not add washer fluid when the EV system is hot or operating as washer fluid contains alcohol and may catch fire if spilled on the motor, etc. Notice: Do not use any fluid other than washer fluid Do not use soapy water or antifreeze instead of washer fluid.Doing so may cause streaking on the vehicle’s painted surfaces, as well as damaging the pump leading to problems of the washer fluid not spraying. Diluting washer fluid Dilute washer fluid with water as necessary.Refer to the freezing temperatures listed on the label of the washer fluid bottle.