Seat Heater Unit Diagnosis Mode

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.

You can enter the diagnosis mode by turning the seat heater button on.
You can enter the diagnosis mode by referring to following description.
- Push IGN ON while pressing the seat heater button from IGN OFF.
- Keep pressing IGN ON for more than three seconds before pressing it once again for more than three seconds within 2 seconds.
- All LED indicators on the driver and passenger seat button will blink 1 times.

After entering the diagnosis mode, you can check what failed by checking the blinking LED.

[Driver/Passenger Seat Heater]

Courtesy of HYUNDAI MOTOR AMERICA

Failure Indicator	Inspection Items	Detailed Inspections
Low: FLASHING Mid: FLASHING High: ON	Low voltage detection	IGN1 voltage of 8.5 V or lower
Low: FLASHING Mid: FLASHING High: ON	Over voltage detection	IGN1 voltage of 16.5 V or lower
Low: OFF Mid: FLASHING High: ON	Fuse (Short)	Disconnection or missing connector of heating seat B (+) line
Low: OFF Mid: ON High: FLASHING	NTC/Heater (Disconnected)	Heater mat disconnected NTC (+) wiring disconnected NTC (-) wiring disconnected Heater (+) wiring disconnected Heater (-) wiring disconnected
Low: FLASHING Mid: ON High: OFF	NTC/Heater (Short)	NTC (+)/NTC (-) Short
Low: OFF Mid: ON High: FLASHING		NTC (+)/Heater (+) Short
Low: FLASHING Mid: ON High: OFF		NTC (+)/Heater (-) Short Heater (+)/Heater (-) Short Heater (+)/NTC (-) Short NTC (-)/NTC (-) Short wiring Short
Low: OFF Mid: ON High: FLASHING		NTC (+)/Heater (+) wiring Short
Low: FLASHING Mid: ON High: OFF		NTC (+)/Heater (-) wiring Short Heater (+)/Heater (-) wiring Short Heater (-)/NTC (-) wiring Short
Low: FLASHING Mid: ON High: FLASHING	Loss of temperature feedback	Target temperature not reached within 40 minutes

You can check the malfunctioning by checking the blinking LED.
Pressing the IGN OFF button will end the diagnosis mode for the heater seat.
You can check whether the heating seat system works properly after turning the IGN ON. If you want to check the error code, you can refer to the procedure of 2 above.