When the interior light switch is in the DOOR position and all doors (and tailgate) are locked and closed, the room lamp will come on for 30 seconds if any of the below is performed.
At this time, if you press the door lock button, the lamps will turn off immediately.
Kia Cee'd JD Service Manual: Components and components location
Components
1. Parking brake lever
2. Parking brake cable
3. Equalizer assembly
...
Kia Cee'd JD Service Manual: Components and components location
Components
1. ESP Control Module (HECU)
2. Front Wheel Speed Sensor
3. Rear Wheel Speed Sensor
4. Steering Wheel Angle Sensor
5. Yaw-late & Lateral G Sensor
6. ABS Warning Lamp
7. EBD/Parking brake Warning Lamp
8. ESP OFF Lamp ...