Inspect the stop lamp circuit
WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
Connect probe to each terminal wire and confirm oscilloscope waveform.
[Stop lamp switch input/output]
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[Oscilloscope waveform screen]
 Courtesy of KIA MOTORS AMERICA, INC.
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