While driving on a remote highway the seat heating was on on both the driver and passenger seat. After a while it felt way ti hot and smelled like something burning and found the passenger jacket (that was taken off and left behind his back to be extensively burnt. We stopped and checked the seat. We found a big hole and the seat was damaged as well as the 300 dls coat. Plus the risk of having burns I. The passenger back, which was only protected by the cost and other layers of clothing