If the smart key does not operate normally, you can lock or unlock the doors by using the mechanical key.
1.Press and hold the release button (1) and remove the mechanical key (2).
2.Insert the key into the hole of the outside door handle. Turn the key toward the rear of the vehicle to unlock and toward the front of the vehicle to lock.
3. To reinstall the mechanical key, put the key into the hole and push it until a click sound is heard.
Kia Cee'd JD Service Manual: Crash Pad Lower Panel Components and components location
Component Location
1. Crash pad lower panel
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Kia Cee'd JD Service Manual: Rear Seat Back Cover Components and components location
Component Location
1. Rear seat back cover [LH]
2. Rear seat back cover [RH]
...