Lexus RX 450h 2010 Owner's Manual, Quick Manual page 8

Hybrid System
Your vehicle is a hybrid vehicle. It has characteristics different from conventional vehicles. Be
sure you are closely familiar with the characteristics of your vehicles, and operate with care.
The hybrid system combines a gasoline engine and an electric motor (traction motor)
according to driving conditions, improving fuel efficiency and reducing exhaust emissions.
For details, refer to the "Owner's Manual".
■
Hybrid System Indicator
■ Regenerative braking
The motor generator converts kinetic energy to electric energy when:
● The accelerator pedal is released.
● The brake pedal is depressed with the shift lever in D or S.
■ Sounds and vibrations specific to a hybrid vehicle
There may be no engine sounds or vibrations 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.
● Sounds may be heard from the hybrid battery (traction battery) under the rear seat when
the hybrid system starts or stops.
● Sounds from the hybrid system may be heard when the back door is open.
● Sounds may be heard from the hybrid transmission when the engine is started or
stopped, or while the engine is idling.
● Engine sounds may be heard when accelerating sharply.
● Sounds may be heard due to regenerative braking when the brake pedal is depressed
and accelerator is loosened.
● Vibrations may be felt when the gasoline engine starts or stops.
● Cooling fan sounds may be heard from the air intake vents under the rear seat.
7
Displays the output and regeneration level of the
hybrid system.
● By keeping the indicator within the Eco area,
more fuel-efficient driving can be achieved.
● The Charge area indicates regeneration sta-
tus.