WARNING: This page is about a different car, the 2019 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the ignition switch connector (B) and key warning switch connector (A) from under the steering column.
Courtesy of KIA MOTORS AMERICA, INC.
Courtesy of KIA MOTORS AMERICA, INC.
Check for continuity between the terminals.
If continuity is not as specified, replace the switch.