Kia Niro: 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)

Heater seat : 1.77?±10%/23°C

Ventilated seat : 1.93?±10%/23°C

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

Rear Seat Heater

1.

Check for continuity and measure the resistance between terminals No 1 and No 4.

Standard value

Rear seat (Cushion only) : 3.16?±10%/23°C

2.

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

Standard value

High (Cushion) : 38±2°C

Low (Cushion) : 42±2°C

Seat Heater Unit Diagnostic Mode

1.

Enter diagnostic mode by operating the seat heater switch.

2.

Enter diagnostic mode by referring to the below description.

Keep pressing the seat heater switch for over 3 seconds and release the switch. Then, within 2 seconds, press the switch again for over 3 seconds.

When diagnostic mode is entered, all switch LEDs will blink once.

3.

After entering diagnostic mode, check cause of failure according to blinking or illumination of LEDs.

[Driver Side / Passenger Side Seat Heater]

1st Row Seat Heater Unit

Failure Indication
Inspection Item
Cause of Failure
Low : OFF
Mid : OFF
High : FLASHING
Detect low voltage

IGN1 power below 8.5V

Detect over voltage

IGN1 power below 16.5V

Low : FLASHING
Mid : FLASHING
High : FLASHING
Broken fuse

B (+) fuse disconnected

Low : OFF
Mid : ON
High : FLASHING
Disconnected / Short NTC

NTC element defective

Short between NTC connector terminals

NTC (+) wiring disconnected

NTC (-) wiring disconnected

Low : FLASHING
Mid : FLASHING
High : FLASHING
Disconnected / Short heater

Heater element defective

Short between heater unit connector terminals

Heater (+) wiring disconnected

Heater (-) wiring disconnected

Low : ON
Mid : ON
High : FLASHING
Detect loss of temperature

If target temperature is not reached within 40 minutes


2nd Row Seat Heater Unit

Failure Indication
Inspection Item
Cause of Failure
Low : OFF
High : OFF
Detect low voltage

IGN1 power below 8.5V

Detect over voltage

IGN1 power below 16.5V

Low : FLASHING
High : FLASHING
Broken fuse

B (+) fuse disconnected

Low : OFF
High : FLASHING
Disconnection/Short in NTC

NTC element defective

Short between NTC connector terminals

NTC (+) wiring disconnected

NTC (-) wiring disconnected

Low : FLASHING
High : FLASHING
Disconnection/Short in heater

Heater element defective

Short between heater unit connector terminals

Heater (+) wiring disconnected

Heater (-) wiring disconnected

Low : ON
High : FLASHING
Detect loss of temperature

If target temperature is not reached within 40 minutes


4.

Check the defective area by the blinking pattern of LED lamps.

5.

Error is recorded by the seat heater unit.

6.

Error memory can be deleted by pressing the seat heater switch for over 5 seconds with the LED lamps blinking four times.

7.

Switching "OFF" the ignition will end the diagnostic mode for seat heater unit.

8.

Switch "ON" the ignition and check that seat heater system operates properly. To check the error code, refer to step 2 above.

Seat Heater Schematic diagrams
Circuit Diagram Front Seat Heater Rear Seat Heater ...

Seat Heater Switch Components and components location
Components Front Seat Switch 1. Driver side seat heater switch 2. Passenger side seat heater switch Rear Seat Switch ...

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