Toyota Prius 2011 Manual page 168

2-1. Driving procedures
When leaving the vehicle
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If the indicator on the "POWER" switch is not off, the "POWER" switch is still
not in OFF mode.
Turn the "POWER" switch to OFF before you leave the vehicle.
Auto "P" position function
■
●
If the "POWER" switch is pressed while the hybrid system is operating
and the vehicle is at a complete stop, the "POWER" switch will be turned
to OFF, then the shift position will be automatically switched to "P".
When turning the "POWER" switch to OFF while the shift position is not
set to "P", operate the "POWER" switch while pushing down fully on the
brake pedal. Then, release the brake pedal after confirming that the shift
position indicator on the instrument cluster is set in "P".
●
If the auto "P" position function is malfunctioning, it may not be possible
to turn the "POWER" switch to OFF. In this event, the "POWER" switch
can be turned to OFF after applying the parking brake. 
Have the vehicle inspected by your Toyota dealer immediately.
When the ambient temperature is low, such as during winter driving
■
conditions
It may take time until the "READY" indicator comes on.
When the P position control system malfunctions
■
The "POWER" switch will not be able to be turned off. In such a case, the
switch can be turned off after applying the parking brake.
Have the vehicle inspected by your Toyota dealer immediately.
Sounds and vibrations specific to a hybrid vehicle
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P. 31
When the hybrid system is malfunctioning
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P. 507
Electronic key battery depletion
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P. 64
When the electronic key battery is discharged
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P. 469
Conditions affecting operation
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P. 65
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