Toyota PRIUS Manual page 201

 Unstable items, such as dangling accessories or clothes hanging on the
coat hooks, are in the vehicle.
 A window is open.
 The vehicle is inside an automatic or high-pressure car wash.
 The vehicle experiences impacts, such as hail, lightning strikes, and
other kinds of repeated impacts or vibrations.
PRIUS PHV_OM_OM47831E_(EE)
Ice or snow is removed from the vehi-

cle, causing the vehicle to receive
repeated impacts or vibrations.
 The wind or something similar causes
an externally mounted
coated windshield cover to move.
1-8. Theft deterrent system
reflectively
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