Lexus LS 600h L 2015 Owner's Manual page 81

After the 12-volt battery has discharged or has been changed or removed
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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.
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.
For safety, apply the parking brake and make sure to 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:
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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seats 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 hybrid transmission when the hybrid system starts
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or stops.
Engine sounds may be heard when accelerating sharply.
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Sounds may be heard due to regenerative braking when the accelerator pedal is
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released or the brake pedal is depressed.
Vibration may be felt or sounds may be heard when the gasoline engine starts or
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stops.
Cooling fan sounds may be heard from the air intake vents on the package tray.
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LS600hL_U(OM50E41U)
1-2. Hybrid system
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