The passenger side active head restraints (AHRs) deployed unexpectedly while the van was unoccupied inside our garage. Upon investigation the metal latch bar was still in it’s undeployed location (latched into the head rest) but there were visible plastic parts missing on the other portion of the headrest. It appears that the plastic clamps had broken at some point and caused the AHR to deploy — luckily nobody was in that seat at the time. The AHR was unable to be reset so a replacement headrest has been ordered for installation.