Hyundai Santa Fe: Seat Electrical / Seat Heater (Non-Air Ventilation). Repair procedures

Hyundai Santa Fe (TM) 2019-2025 Service Manual / Body Electrical System / Seat Electrical / Seat Heater (Non-Air Ventilation). Repair procedures

Inspection

Driver/Passenger

Check for continuity and measure the resistance between terminals.

No.	Description	No.	Description
1	Heater (+)	3	NTC (-)
2	NTC (+)	4	Heater (-)

Driver/Passenger	Fabric(± 5%)	Leather(± 5%)
High	2.56 kΩ	1.84 kΩ
Middle	3.77 kΩ	3.22 kΩ
Low	5.43 kΩ	5kΩ

Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.

Driver/Passenger	Fabric(± 2%)	Leather(± 2%)
High	42/50 °C	42/50 °C
Middle	39/45 °C	39/45 °C
Low	36/40 °C	36/40 °C

Second Line Seat Heater

Check for continuity and measure the resistance between terminals.

[RH]

[LH]

No.	Description	No.	Description
1	Heater (+)	3	NTC (-)
2	NTC (+)	4	Heater (-)

Second Line Seat	Fabric(± 5%) / Leather(± 5%)
High	2.29 kΩ
Low	4.25 kΩ

Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.

Driver/Passenger	Fabric	Leather
High	1.73V
Low	1.14V

Diagnosis mode

Enter the diagnostic mode referring to below description.

•	In failure mode, press the ventilation seat button for 4 seconds and release it.

•	Press the ventilation seat button for 2 seconds and release it.

•	Lastly, press the ventilation seat button for 4 seconds and release it.

•	When entering the failure mode, the LED of the ventilation seat button turns ON/OFF/blinks at each stage.

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

3.	The table below indicates the failure based on priority, upper item means higher priority.

4.	If more than one failure is detected, higher priority failure is displayed through the LED flashing pattern.

Lower priority failure will be displays if higher priority failure is reset.

[Heater Switch]

[Driver/Passenger]

Failure indicator	Inspection items	Detailed inspections
High : ON Middle : FLASHING Low : FLASHING (Low/Over voltage detection) Low : OFF (Fuse disconnection)	Low voltage detection Over voltage detection Fuse disconnection	1) IGN1 Less than 8.5V 2) IGN1 Less than 16.5V 3) IGN2 fuse disconnection
High : FLASHING Middle : ON Low : OFF	Detection of NTC/Heater disconnect	- NTC element failure - Heater mat disconnection 1) Cushion/Seat back heater mat disconnection 2) Disconnection in the NTC (+) wiring 3) Disconnection in the NTC (-) wiring 4) Disconnection in the heating wire (+) 5) Disconnection in the heating wire (-)
High : OFF Middle : ON Low : FLASHING	Short of between the connector terminals	Disconnection in the NTC (+)/NTC (-) wiring
High : OFF Middle : ON Low : FLASHING	Short of between the connector terminals	Short in the NTC (+)/Heater(-) wiring
High : OFF Middle : ON Low : FLASHING	Short of between the connector terminals	1) Short in the NTC (+)/Heater(-) wiring 2) Short in the Heater (+)/Heater(-) wiring 3) Short in the Heater (+)/NTC(-) wiring
High : OFF Middle : ON Low : FLASHING	Heater wiring short	4) Disconnection in the NTC (+)/NTC (-) wiring
High : FLASHING Middle : ON Low : OFF	Heater wiring short	Short in the Heater (+)/NTC(+) wiring
High : OFF Middle : ON Low : FLASHING	Heater wiring short	1) Short in the NTC(+)/Heater (-) wiring 2) Short in the Heater (+)/Heater(-) wiring 3) Short in the Heater (+)/NTC(-) wiring
High : FLASHING Middle : ON Low : FLASHING	Loss of temperature feedback	Target temperature not reached within 40 minutes

[Second line seat heater]

Failure indicator	Inspection items	Detailed inspections
High : OFF Low : FLASHING	Low voltage detection Over voltage detection	1) IGN1 Less than 8.5V 2) IGN1 Less than 16.5V
High : ON Low : OFF	Fuse disconnection	IGN2 fuse disconnection
High : ON Low : FLASHING	Detection of NTC/Heater disconnect	1) Cushion/Seat back heater mat disconnection 2) Disconnection in the NTC (+) wiring 3) Disconnection in the NTC (-) wiring 4) Disconnection in the heating wire (+) 5) Disconnection in the heating wire (-)
High : FLASHING Low : OFF	Short of between the connector terminals	Short in the NTC (+)/NTC (-) wiring
High : FLASHING Low : ON	Short of between the connector terminals	Short in the NTC (+)/Heater (-) wiring
High : FLASHING Low : OFF	Short of between the connector terminals	1) Short in the NTC (+)/Heater (-) wiring 2) Short in the Heater (+)/Heater (-) wiring 3) Short in the Heater (+)/NTC (-) wiring
High : FLASHING Low : OFF	Heater wiring short	Short in the NTC (+)/NTC (-) wiring
High : ON Low : FLASHING	Heater wiring short	Short in the NTC (+)/Heater (+) wiring
High : FLASHING Low : OFF	Heater wiring short	1) Short in the NTC (+)/Heater (-) wiring 2) Short in the Heater (+)/Heater (-) wiring 3) Short in the Heater (+)/NTC (-) wiring
High : OFF Low : ON	Loss of temperature feedback	Target temperature not reached within 40 minutes

6.	If you press the seat heater button for more than five seconds, the LED for malfunctioning memory will blink four times and the recorded memory will be deleted.

7.	Pressing the IGN OFF button will end the diagnosis mode for the seat.

8.	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 (Non-Air Ventilation). Schematic diagrams

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