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: Components and components location
Component Location
1. Instrument cluster assembly
2. Seat belt switch
3. Vehicle speed sensor
4. Engine coolant temperature sensor
5. Oil pressure switch
6. Brake fluid level warning switch
7. Parking brake switch
8. Door switch
...
Kia Cee'd JD Service Manual: Rear Door Latch Components and components location
Component Location
1. Rear door latch
...