Lexus RX 450h 2010 Owner's Manual page 178

Situations in which EV drive mode cannot be turned on
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It may not be possible to turn EV drive mode on in the following situations. If it can-
not 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 25 mph (40 km/h) 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
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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 25 mph (40 km/h).
●
The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
●
Possible driving distance when driving in EV drive mode
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In EV drive mode, it is possible to drive up about 0.5 mile (1 km) if driving at a speed of
about 25 mph (40 km/h) or less. (The distance that is possible depends on the hybrid
battery [traction battery] level and driving conditions.)
Fuel economy
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RX450h is designed to achieve the best possible fuel economy during normal driv-
ing (using the gasoline engine and electric motor [traction motor]). Driving in EV
drive mode more than necessary may lower fuel economy.
2-1. Driving procedures
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