WARNING: This page is about a different car, the 2018 Kia Forte5 and 2018 Kia Forte. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Audio Remote Control System Circuit (1 Of 4)
Courtesy of KIA MOTORS AMERICA, INC.
Fig 2: Audio Remote Control System Circuit (2 Of 4)
Courtesy of KIA MOTORS AMERICA, INC.
Fig 3: Audio Remote Control System Circuit (3 Of 4)
Courtesy of KIA MOTORS AMERICA, INC.
Fig 4: Audio Remote Control System Circuit (4 Of 4)