Hyundai Kona: Seat Electrical / Seat Heater Repair procedures

Inspection
Front Seat Heater
1.
Check for continuity and measure the resistance between terminals No 3 and No 6.

Standard value
Driver / Assists (cushion + back) :
2.00Ω±10%/23°C (non Air ventilation seat)
1.79Ω±10%/23°C (Air ventilation seat)
2.
Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.
Standard value
1st : cushion : 36±2°C, back : 40±2°C
2st : cushion : 39±2°C, back : 45±2°C
3st : cushion : 42±2°C, back : 50±2°C
Seat Heater Unit Diagnosis Mode
1.
You can enter the diagnosis mode by turning the seat heater button on.
2.
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 againe for more than three seconds within 2 seconds.
All LED indicators on the driver and passenger seat button will blink 1 times.
3.
After entering the diagnosis mode, you can check what failed by checking the blinking LED.
[Driver / Passenger Seat Heater]

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

4.
You can check the malfunctioning by checking the blinking LED.
5.
Pressing the IGN OFF button will end the diagnosis mode for the heater seat.
6.
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.
Seat Heater Schematic diagrams
Circuit Diagram [Front Seat Heater (Non-Air Ventilation)] ...

Seat Heater Switch Components and components location
Components [Front Seat] ...

Other information:

Hyundai Kona (OS) 2018-2020 Service Manual: Manifold Absolute Pressure Sensor (MAPS) Description and operation
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Hyundai Kona (OS) 2018-2020 Owners Manual: Front air ventilation seat
The air ventilation seats are provided to cool the front seats by blowing air through small vent holes on the surface of the seat cushions and seatbacks. When the operation of the air ventilation seat is not needed, keep the switches in the OFF position. While the engine is running, push the swit ...

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