Lexus GS 450h 2008 Owner's Manual page 27

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 the rear
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seat when the hybrid system starts or stops.
Sounds from the hybrid system may be heard when the trunk lid is open.
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Sounds may be heard from the transmission when the hybrid system starts or
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stops.
Engine sounds may be heard when accelerating sharply.
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Sounds may be heard from the regenerative brake when you press the brake
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pedal.
Vibration may be felt when the gasoline engine starts or stops.
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You may hear cooling fan sounds coming from the air intake vents behind the
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rear seat.
Maintenance, repair, recycling, and disposal
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Contact your Lexus dealer regarding maintenance, repair, recycling and disposal.
Do not dispose of the vehicle yourself.
1-1. Hybrid system
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