2012 Toyota Prius Owners Manual - Page 579
2012 Toyota Prius Manual
Page 579 highlights
2 -4 . U sing ot he r driving syst e m s PCS (Pre -Collision Syst e m ) ∗ When the radar sensor detects possibility of a frontal collision, the pre-collision systems such as the brakes and seat belts are automatically engaged to lessen impact to occupants as well as vehicle damage.
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