Hyundai Tucson: Seat Electrical / Seat Heater (Air Ventilation)
1. Seat cushion heater (Ventilation)
2. Seat heater (Ventilation) unit
3. Seat back heater(Ventilation)
| Pin | Connector A | Connector B |
| 1 | IGN 1 | Ventilation heater battery (+) |
| 2 | Blower power_LH | Heater power_LH |
| 3 | Blower speed_LH | Heater power_RH |
| 4 | Blower RPM input_LH | - |
| 5 | - | Heater ground_LH |
| 6 | - | Ventilation heater ground |
| 7 | CAN LOW | Ventilation heater battery (+) |
| 8 | CAN HIGH | - |
| 9 | - | - |
| 10 | LIN | - |
| 11 | - | Heater ground_RH |
| 12 | Blower ground_LH | Ventilation heater ground |
| 13 | IGN 2 | |
| 14 | Blower power_RH | |
| 15 | Blower speed_RH | |
| 16 | Blower RPM input_RH | |
| 17 | - | |
| 18 | - | |
| 19 | ||
| 20 | NTC (+)_LH | |
| 21 | NTC (+)_RH | |
| 22 | NTC (-)_RH | |
| 23 | NTC (-)_LH | |
| 24 | Blower ground_RH |
1.Check for continuity and measure the resistance between terminals.
| Pin | Description | Pin | Description |
| 1 | - | 4 | NTC (+) |
| 2 | - | 5 | Heater (-) |
| 3 | Heater (+) | 6 | NTC (-) |
2.Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.
| Driver/Passenger | Cushion/Back | NTC Resistance (kΩ) |
| High | 42/50 °C | 4.24 kΩ |
| Mid | 39/45 °C | 6.4 kΩ |
| Low | 36/40 °C | 9.62 kΩ |
1.Check for continuity and measure the resistance between terminals.
| Pin | Description | Pin | Description |
| 1 | Heater (+) | 3 | NTC (-) |
| 2 | NTC (+) | 4 | Heater (-) |
| Pin | Description | Pin | Description |
| 1 | Heater (+) | 2 | Heater (-) |
2.Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.
| Rear heater | |||
| Vomlume | Max.temperature (±2°C) | NTC Resistance (kΩ) ±1% | |
| Cushion | Back | ||
| High | 42 | 50 | 4.909 |
| Low | 38 | 45 | 7.453 |
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.
| 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 |
| 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.
Seat Heater (Non-Air Ventilation)
- Components
1. Seat heater unit2. Seat cushion heater 3. Seat back heater
1. Second line seat heater unit2. Second line seat cushion heater3. Second line seat back heater
- Components ...
Seat Heater Switch
- Components
1. Front seat heater switch2. Rear seat heater switch
- Circuit Diagram
Connector Pin Information
PinDescriptionPinDescription
1IGN 117PDW switch
2ILL (+)18PDW IND
34W ...
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