Inspect The Stop Lamp Circuit
WARNING: This page is about a different car, the 2023 Kia Seltos. 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]
 Courtesy of KIA MOTORS AMERICA, INC.
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[Oscilloscope waveform screen]
 Courtesy of KIA MOTORS AMERICA, INC.
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