Toyota Prius c 2014 Owner's Manual page 175

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Switching to EV drive mode when the gasoline engine is cold
If the hybrid system is started while the gasoline engine is cold, the gasoline
engine will start automatically after a short period of time in order to warm
up. In this case, you will become unable to switch to EV drive mode.
After the hybrid system has started and the "READY" indicator has illumi-
nated, press the EV drive mode switch before the gasoline engine starts to
switch to EV drive mode.
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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.
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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.
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The temperature of the hybrid system is low.
The vehicle has been left in temperatures lower than about 68
for a long period of time etc.
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The gasoline engine is warming up.
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The hybrid battery (traction battery) is low.
When the amount of remaining hybrid battery (traction battery) charge
displayed on the meter or Display Audio system is low. (→P. 35)
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Vehicle speed is high.
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The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
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The windshield defogger is in use.
2-1. Driving procedures
° F (20 ° C)
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