WHAT WOULD CAUSE THE SIDE CURTAIN AIRBAGS TO DEPLOY??FOR NO APPARENT REASON... on 2009 Mercury Mariner

SIDE CURTAIN AIRBAGS DEPLOYED.VEHICLE WAS NOT INVOLVED IN AN ACCIDENT OR ANYTHING.

1 answer
failure some where in circuit. bring to dealership for tech. advise. run the VIN# to find out if any recalls on this item.