Lexus RX450H Manual page 39


Charging the hybrid battery (traction battery)

As the gasoline engine charges the hybrid battery (traction battery), the
battery does not need to be charged from an outside source. However, if
the vehicle is left parked for a long time the hybrid battery will slowly
discharge. For this reason, be sure to drive the vehicle at least once every
few months for at least 30 minutes. If the hybrid battery becomes fully
discharged and you are unable to jump-start the vehicle with the 12-volt
battery, contact any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional.

If the shift lever is in N, the hybrid battery (traction battery) will not be
charged. Always put the shift lever in P when the vehicle is stopped.
When driving in heavy traffic, operate the vehicle with the shift lever in
D or S to avoid discharging the battery.

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 any
authorized Lexus dealer or repairer, or another duly qualified and equipped
professional.

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 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.

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.

Vibration 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.
RX450h_EE
1-1. Hybrid system
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