Lexus RX450H Manual page 223

2-1. Driving procedures

Situations in which EV drive mode cannot be turned on
It may not be possible to turn EV drive mode on in the following situations.
If it cannot be turned on, a buzzer will sound and a message will be shown
on the multi-information display.

The temperature of the hybrid system is high.
The vehicle has been left in the sun, driven on a hill, driven at high
speeds, etc.

The temperature of the hybrid system is low.
The vehicle has been left in extremely low temperatures for a long
period of time etc.

The gasoline engine is warming up.

The hybrid battery (traction battery) is low.

Vehicle speed is about 40 km/h (25 mph) or more.

The accelerator pedal is depressed firmly or the vehicle is on a hill etc.

The windshield defogger is in use.

Automatic cancelation of EV drive mode
When driving in EV drive mode, the gasoline engine may automatically
restart in the following situations. When EV drive mode is canceled, a
buzzer will sound and the EV drive mode indicator will flash and go off.

The hybrid battery (traction battery) becomes low.

Vehicle speed becomes more than about 40 km/h (25 mph).
If engine coolant temperature is low, EV drive mode may be canceled
when vehicle speed is below 40 km/h (25 mph).

The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
When it is possible to inform the driver of automatic cancelation in advance,
a prior notice screen will appear on the multi-information display.

Possible driving distance when driving in EV drive mode
In EV drive mode, it is possible to drive up about 1 km (1/2 mile) if driving
at a speed of about 40 km/h (25 mph) or less.
(The distance that is possible depends on the hybrid battery [traction battery]
level and driving conditions.)

Fuel economy
RX450h is designed to achieve the best possible fuel economy during nor-
mal driving (using the gasoline engine and electric motor [traction motor]).
Driving in EV drive mode more than necessary may lower fuel economy.
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