Lexus OM30727U, Manual

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1-1. Hybrid system
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After the 12 volt battery has discharged or has been changed or removed
The gasoline engine may not stop even if the vehicle is running on the hybrid battery
(traction battery). If this continues for a few days, contact your Lexus dealer.
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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 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.
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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) behind the rear
seat when the hybrid system starts or stops.
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Sounds may be heard from the transmission when the hybrid system starts or
stops.
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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
pedal.
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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
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.