Toyota 2008 Prius Quick Reference Manual page 56

Sounds and vibrations specific to a hybrid vehicle
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There may be no engine sounds or vibration even though the vehicle is able
to move. Always put the shift lever in "P" when parked.
The following sounds or vibrations may occur when the hybrid system is
operating, and are not a malfunction.
Motor sounds may be heard from the engine compartment.
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Sounds may be heard from the hybrid battery (traction battery) behind
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the rear seat when the hybrid system starts or stops.
l Sounds from the hybrid system may be heard when the back door lid is
open.
Sounds may be heard from the transmission when the hybrid system
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starts or stops.
Engine sounds may be heard when accelerating sharply.
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l Sounds may be heard from the regenerative brake when you press the
brake pedal.
l Vibration may be felt when the gasoline engine starts or stops.
You may hear cooling fan sounds coming from the air intake vents behind
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the rear seat.
Maintenance, repair, recycling, and disposal
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Contact your Toyota dealer regarding maintenance, repair, recycling and dis-
posal. Do not dispose of the vehicle yourself.
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