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The heated seats in your 2015 GMC Terrain are controlled by a fuse inside the interior fuse panel. The exact location of the fuse depends on the specific trim and model of your vehicle, so refer to the diagram on the underside of the fuse panel cover for guidance. If you find a blown fuse, be sure to replace it with one that has the same amperage rating. If all fuses are intact but the seat heaters are still not working, there may be a short circuit in the heating coils, necessitating the replacement of the entire heater unit. If neither the driver's nor passenger's seat heaters are functioning, it is recommended to have the front seat heater control module inspected, as this is a common issue.
The fuse might be the cause of the problem with the heated seats not functioning in a 2015 GMC Terrain.