The best place to start when troubleshooting any electrical problem with your 1st generation (2010, 2011, 2012, 2013, 2014, 2015 & 2016) GMC Terrain SUV is to check for a faulty or “blown” fuse or relay in either the engine bay or the interior passenger compartment electrical panels. Take a look at my DIY tutorial for the procedure by clicking on the text link or thumbnail image below.
2010-2016 GMC Terrain Electrical Fuses Replacement Guide
