The Active Head Restraint is actually more complicated...see deployed photo. The tilting part is actually just for comfort as explained in this link which is what I just discovered (interesting that a headrest is so complicated):
Active head restraints are those which require the vehicle occupants to take some action to initiate, such as electronic stability control. A passive system does not require any action by the vehicle occupants to operate. It simply activates when a set of criteria or sequence of events occur.
While the new Active Head Restraints (AHR) are passive in operation, they are referred to as an active system. The AHR system is designed to deploy in the event of a rear collision with the gear selector in any gear except Reverse. The AHR system is standard equipment for both front seats on the 2011 Grand Cherokee.
The AHR system has a linkage permitting the lower part of the pad to tilt forward for comfort. It also includes a linkage that articulates the pad during deployment, a caliper-type latch mechanism, and the latch striker.
The only electrical component of the AHR unit is a latch-release solenoid and the pigtail wire that connects the solenoid to the vehicle’s electrical system. The ORC does not monitor the latch for an open or closed position. The pigtail wire and connector are routed through the center of the right support posts and down through the guide sleeve into the interior of the seat back. The pigtail wire and connector are connected to a dedicated takeout and connector of the seat wire harness."