Sounds And Vibrations Specific To A Hybrid Vehicle - Lexus rx450h Service Manual

Sounds and vibrations specific to a hybrid vehicle

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There may be no engine sound or vibration even though the vehicle is able to move with
the "READY" indicator is illuminated. For safety, make sure to shift the shift lever to P and
apply the parking brake 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 seats
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when the hybrid system starts or stops.
Relay operating sounds such as a snap or soft clank will be emitted from the hybrid bat-
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tery (traction battery), behind the rear seats, when the hybrid system is started or
stopped.
Sounds from the hybrid system may be heard when the back door is open.
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Sounds may be heard from the transmission when the gasoline engine starts or stops,
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when driving at low speeds, or during idling.
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
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or as the accelerator pedal is released.
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 seats.
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Vehicle proximity notification system
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In the following cases, the vehicle proximity notification system may be difficult for sur-
rounding people to hear.
In very noisy areas
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In the wind or the rain
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Also, as the vehicle proximity notification system is installed on the front of the vehicle, it
may be more difficult to hear from the rear of the vehicle compared to the front.
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.
Customization
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Some functions can be customized. (P. 607)
RX450h_U_OM0E013U
1-3. Hybrid system
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