The warning light illuminates if the temperature of the engine coolant is above 120±3°C (248±5.4°F).
Do not continue driving with an overheated engine. If your vehicle overheats, refer to “Overheating” in chapter 6.
✽ NOTICE
If the engine coolant temperature warning light illuminates, it indicates overheating that may damage the engine.
Kia Cee'd JD Service Manual: Troubleshooting
Troubleshooting
•
The battery must be in good condition and fully charged for
this troubleshooting.
...
Kia Cee'd JD Service Manual: Hazard Lamp Switch Repair procedures
Inspection
1.
It will be able to diagnose defects of hazard switch with GDS quickly.
GDS can operates actuator forcefully, input/output value monitoring
and self diagnosis.
2.
Select model and "BCM".
...