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If the AUX input isn't working in your Kia Ceed, start by rebooting both the head unit and your external device. Software issues are a common cause of AUX problems, and a simple restart can often resolve them. If the issue persists, inspect the port itself for damage or debris. If the port is damaged, you may need to replace it. Corrosion or bent connecting pins can also disrupt data transmission and typically require a new port for a fix.
If the AUX input stops functioning in your Kia ceed car, start by inspecting the fuses and then explore the possibility of a module malfunction.