The luggage room lamp comes on when the tailgate is opened.
Kia Cee'd JD Service Manual: Rear Pillar Trim Components and components location
Component Location
[5Door]
1. Rear pillar trim
[3Door]
1. Rear pillar trim
...
Kia Cee'd JD Service Manual: Specifications
Specification
Ignition System
Ignition Coil
Item
Specification
Primary Coil Resistance (Ω)
0.75 ± 15% [20°C (68°F)]
Secondary Coil Resistance (kΩ)
5.9 [20°C (68°F)] ...