Device for activation of an active head rests in a vehicle.

Procedure for activating a headrest (10) active for a vehicle, wherein the headrest (10) is activated depending on a first signal of a willing first impact sensor (12) centrally on the vehicle and a second signal of a second impact sensor (13) arranged in the rear area of ​​the vehicle, wherein the first signal an acceleration signal is transferred through integration to a drop in speed, because falling speed it is subjected to a threshold decision, wherein it is decided on the trigger when the falling speed is above the threshold which is variable over time and depending on a relative speed of impact is changed as the second signal.