Kia Niro: Seat Electrical / Seat Heater Repair procedures

Kia Niro 2017 (DE HEV) Service Manual / Body Electrical System / Seat Electrical / Seat Heater Repair procedures

Inspection

Front Seat Heater

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

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

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

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.

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.

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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