2010 Toyota Tacoma Double Cab Owners Manual - Page 69
2010 Toyota Tacoma Double Cab Manual
Page 69 highlights
1-3. Adjustable components (seats, mirrors, steering wheel) Active head restraints (Access Cab and Double Cab models only) When the occupant's back presses against the seatback during a rear-end collision, the head restraint moves slightly forward to help reduce the risk of whiplash on the seat occupant.