Cadillac is recalling about 180 XTS vehicles north of the border over issues with the rear seat headrest mechanisms.
After the rear seat headrests have been folded out, the mechanism may not lock them in the upright position, increasing the risk of injury in a crash. This recall only affects Canada at the moment, but like with many recalls, is likely to spread to the U.S. soon.
Dealers will inspect the headrest assembly, and replace it if necessary.
UPDATE: The recall has now been announced by NHTSA for the U.S., where it affects 12,626 XTS vehicles. GM will contact affected owners and replace the rear headrests free of charge. For more info, contact General Motors at 1-800-458-8006.