If the EV system will not start Reasons for the EV system not starting vary depending on the situation. Check the following and perform the appropriate procedure: The EV system will not start even though the correct starting procedure is being followed (Starting the EV system) One of the following may be the cause of the problem: The charging cable may be connected to the vehicle. (Safety functions) The electronic key may not be functioning properly.^* (If the electronic key does not operate properly) The traction battery may be completely discharged. Charge the traction battery. (Charging methods) There may be a malfunction in the immobilizer system.^* (Immobilizer system) There may be a malfunction in the shift control system.^* (When the shift control system malfunctions, If a message that indicates the need for the rotary shifter operation is displayed) The EV system may be malfunctioning due to an electrical problem such as electronic key battery depletion or a blown fuse. However, depending on the type of malfunction, an interim measure is available to start the EV system. (Starting the EV system in an emergency) There is a possibility that the temperature of the traction battery is extremely low (approximately below -22°F [-30°C]). (Starting the EV system in an extremely cold environment, When the ambient temperature is low, such as during winter driving conditions) ^*It may not be possible to shift the shift position from P The interior lights and headlights are dim, or the horn does not sound or sounds at a low volume One of the following may be the cause of the problem: The 12-volt battery may be discharged. (If the 12-volt battery is discharged) The 12-volt battery terminal connections may be loose or corroded. (Checking the 12-volt battery) The interior lights and headlights do not turn on, or the horn does not sound One of the following may be the cause of the problem: The 12-volt battery may be discharged. (If the 12-volt battery is discharged) One or both of the 12-volt battery terminals may be disconnected. (Checking the 12-volt battery) Contact your Toyota dealer if the problem cannot be repaired, or if repair procedures are unknown. Starting the EV system in an emergency When the EV system does not start, the following steps can be used as an interim measure to start the EV 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 ACC.^* Press and hold the power switch for about 15 seconds while depressing the brake pedal firmly. Even if the EV system can be started using the above steps, the system may be malfunctioning. Have the vehicle inspected by your Toyota dealer. ^*Setting can be customized. (Power switch)