Toyota PRIUS Manual page 138

1-4. Opening, closing and locking the doors
Security feature

If a door is not opened within approximately 30 seconds after the vehicle is
unlocked, the security feature automatically locks the vehicle again.
 Battery-saving function
The battery-saving function will be activated in order to prevent the elec-
tronic key battery and the 12-volt battery from being discharged while the
vehicle is not in operation for a long time.
 In the following situations, the smart entry & start system may take some
time to unlock the doors.
• The electronic key has been left in an area of approximately 2 m (6 ft.)
of the outside of the vehicle for 10 minutes or longer.
• The smart entry & start system has not been used for 5 days or longer.
 If the smart entry & start system has not been used for 14 days or longer,
the doors cannot be unlocked at any doors except the driver's door. In
this case, take hold of the driver's door handle, or use the wireless
remote control or the mechanical key, to unlock the doors.
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