Why's my GMC Terrain heated seats not working?

If Your GMC Terrain heated seats are not working check the main fuse for the seat heaters. The fuse box is below the steering wheel. Once You have located the fuse box, remove the cover. There may also be a fuse laYout diagram inside the cover. Remove the fuse with either plastic tweezers designed for this job (there may be a pair inside the fuse box), or with a small set of needlenose pliers. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced. Many local parts stores such as Advance Auto Parts and Auto Zone carry a wide variety of fuses. Just make sure to match the correct amp and size fuse that You are replacing.