Toyota Prius Manual page 72

Emergency Response (2012 Model - Continued)
Extrication (Continued)
Active Headrest Removal
The Prius Plug-in hybrid is equipped with active headrests,
located in both front seatbacks. The active headrests are
mechanical non-pyrotechnic head supports that are designed to
reduce neck injuries in the event of a rear collision.
No special methods are required to remove the headrests. Push
the release button and lift to remove the headrest.
NOTE:
The Prius Plug-in hybrid is equipped with an optional
electrochromic auto dimming rear view mirror. The mirror
contains a minimal amount of transparent gel sealed between two
glass plates that will not normally leak.
Headrest
Upper Unit
Cable
Lower Unit
Electrochromic Auto Dimming Rear View Mirror
67
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Front Active Headrest
Mirror Cross Section
Sealed Electrochromic Coating