Toyota Prius 2018, Owner'S Manual, Page: 81 / 820

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1-3. Hybrid system
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Fo
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safety and securi
ty
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Sounds and vibrations specific to a hybrid vehicle
There may be no engine sound or vibration even though the vehicle is able to
move with the “READY” indicator is illuminated. For safety, apply the parking
brake and make sure to shift the shift position to P when parked.
The following sounds or vibrations may occur when the hybrid system is
operating and are not a malfunction:
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Motor sounds may be heard from the engine compartment.
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Sounds may be heard from the hybrid battery (traction battery) when the
hybrid system starts or stops.
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Relay operating sounds such as a snap or soft clank will be emitted from the
hybrid battery (traction battery), behind the rear seats, when the hybrid sys-
tem is started or stopped.
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Sounds from the hybrid system may be heard when the back door is open.
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Sounds may be heard from the transmission when the gasoline engine
starts or stops, when driving at low speeds, or during idling.
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Engine sounds may be heard when accelerating sharply.
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Sounds may be heard due to regenerative braking when the brake pedal is
depressed or as the accelerator pedal is released.
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Vibration may be felt when the gasoline engine starts or stops.
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Cooling fan sounds may be heard from the air intake vent. (
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P. 83)
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Vehicle proximity notification system
In the following cases, the vehicle proximity notification system may be diffi-
cult for surrounding people to hear.
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In very noisy areas
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In the wind or the rain
Also, as the vehicle proximity notification system is installed on the front of
the vehicle, it may be more difficult to hear from the rear of the vehicle com-
pared to the front.
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Maintenance, repair, recycling, and disposal
Contact your Toyota dealer regarding maintenance, repair, recycling and dis-
posal. Do not dispose of the vehicle yourself.