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

Hyundai Santa Fe (TM) 2019-2024 Service Manual / Body Electrical System / Seat Electrical / Seat Heater (Non-Air Ventilation). Repair procedures

Inspection
Driver/Passenger
1.
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

2.
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
1.
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

2.
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
1.
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.
5.
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 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
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 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
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.

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