WARNING: This page is about a different car, the 2016 Hyundai Elantra GT and 2015 Hyundai Elantra GT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying LH, RH Remote Control Switch, Bluetooth Hands Free Switch And Trip Switch
Courtesy of HYUNDAI MOTOR AMERICA
Fig 2: Audio Remote Control Circuit Diagram
Courtesy of HYUNDAI MOTOR AMERICA
Fig 3: Audio Remote Control Connector Description Chart