Toyota PRIUS Manual page 134

1-4. Opening, closing and locking the doors
 Operation signals
A buzzer sounds
doors have been locked/unlocked. (Locked: Once; Unlocked: Twice)
*
:For Australia and New Zealand only
 When the door cannot be locked by the lock sensor on the upper part
of the door handle
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PRIUS PHV_OM_OM47831E_(EE)
*
and the emergency flashers flash to indicate that the
If the door will not lock even when the
topside sensor area is touched, try touch-
ing both the topside and underside sen-
sor areas at the same time.