The best place to start when troubleshooting any electrical problem with your 4th generation (2016, 2017, 2018, 2019 & 2020) Kia Optima sedan is to check for a blown electrical fuse or a faulty relay in either the engine bay or the interior passenger compartment electrical panels. Check out my DIY tutorial for the procedure (with the compatible replacement fuse types) by clicking on the text link or thumbnail image below.