WARNING: This page is about a different car, the 2014 Hyundai Elantra GT and 2013 Hyundai Elantra GT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: CD Player Problem Troubleshooting Flowchart (1 Of 3)
Courtesy of HYUNDAI MOTOR AMERICA
Fig 2: CD Player Problem Troubleshooting Flowchart (2 Of 3)
Courtesy of HYUNDAI MOTOR AMERICA
Fig 3: CD Player Problem Troubleshooting Flowchart (3 Of 3)