The plastic ring mounted at the base of the head restraint shall be removed first by turning it counterclockwise. At the base of the mashup, it is necessary to extend the cover of the seat so as to open access to the retaining ring. He needs to be taken aside. Then repeat the same steps on the other side of the head restraint. The head restraint can now be removed. It will only hold the cable coming out of one of the shorts. This cable is necessary to activate the active head restraint in the event of an accident. To detach the cable, it is necessary to detach the binder at the bottom and to the sides of the seat back and lift it up. An access to the cable lock is displayed. You have to press the plastic tab and get the steel keg out of it. Then the head restraint together with the cable can be easily detached from the Opel Astra J. seat back.