Lexus 2012 RX450h, Owner'S Manual

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1-1. Hybrid system
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Sounds and vibrations specific to a hybrid vehicle
There may be no engine sounds or vibration even though the vehicle is able to
move. Always shift the shift lever 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) under the rear
seat when the hybrid system starts or stops.
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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 hybrid transmission when the engine is started
or stopped, or while the engine is 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 and accelerator is loosened.
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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 vents under the rear seat.
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Maintenance, repair, recycling, and disposal
Contact your Lexus dealer regarding maintenance, repair, recycling and disposal.
Do not dispose of the vehicle yourself.