Seat Heater

Components and Component Location

COMPONENT LOCATION

Front Seat Heater

Front Seat Heater (Ventilation)

Rear Seat Heater

Circuit Diagrams

Circuit diagram

Front Seat Heater

Rear Seat Heater

Repair Procedures

DEPOSIT

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Remove the front passenger seat. (Refer to Body - "Front Seat")
3. 3
   Remove the front seat heater unit (A) after loosening the mounting screws and disconnecting the connectors from the unit (B).

   

4. 4
   Disconnect the negative (-) battery terminal.
5. 5
   Remove the rear seat cushion assembly. (Refer to Body Group - Rear Seat)
6. 6
   Remove the rear seat heater unit (A) after loosening the mounting screws and disconnecting the connector from the unit (B).

   

REMEDY

1. 1
   Install the front seat heater unit.
2. 2
   Install the front passenger seat.
3. 3
   Connect the negative (-) battery terminal.
4. 4
   Install the front seat heater unit.
5. 5
   Install the rear seat cushion.
6. 6
   Connect the negative (-) battery terminal.

Inspection

1. 1
   Check the circuit continuity and measure the resistance between terminals No. 3 and No. 6.

   

   Standard value Driver/Passenger (cushion + seatback): 1.65 Ω ±10% / 23 °C

2. 2
   Turn on the seat warmer after connecting the connector, then check the thermostat by measuring the surface temperature of the seat. Standard value: 1st: cushion: 36 ±2 °C, back: 40 ±2 °C; 2nd: cushion: 39 ±2 °C, back: 45 ±2 °C; 3rd: cushion: 42 ±2 °C, back: 50 ±2 °C
3. 3
   Check the circuit continuity and measure the resistance between terminals No. 1 and No. 4.

   

   Standard value Rear Seat: 1.67 Ω ±10% / 20 °C

4. 4
   Turn on the seat heater after connecting the connector, then check the thermostat by measuring the surface temperature from the HI position. Standard value Upper (cushion): 38 ±2 °C, seatback: 45 ±2 °C; Lower (cushion): 42 ±2 °C, seatback: 50 ±2 °C
5. 5
   You can enter diagnostic mode by pressing the seat heater button.
6. 6
   You can enter diagnostic mode by referring to the following description.

   • Press ALL ON while holding the heater button from ALL OFF.
   • Continue pressing IGN ON for more than three seconds. Before pressing again, wait 2 seconds for more than three seconds.
   • All LED indicators blink once on the driver and passenger seat buttons.
7. 7
   After entering diagnostic mode, the malfunction can be checked by the blinking LED.

   

   Malfunction Indicator Lamp		Components to Inspect	Detailed Checks
   	Low: ON Medium: BLINK High: BLINK	Low voltage detection Overvoltage detection	1) Check the power supply line ALL 1
   	Low: BLINK Medium: OFF High: ON	Seat heater cable power cut off (disconnection)	1) Seat heater B(+) line connector disconnected or missing
   	Low: OFF Medium: BLINK High: ON	Seat heater cable power cut off (disconnection)	1) Seat heater ALL2 line connector disconnected or missing
   	Low: OFF Medium: ON High: BLINK	NTC (open) / Heater (open)	1) NTC (open) 2) NTC connector open or missing 3) Seat heater power line connector disconnected or missing
   	Low: BLINK Medium: ON High: OFF	NTC (short circuit) / Heater (short circuit)	1) NTC cable short circuit (short to ground) 2) Seat heater wire short circuit (short to ground)
   	Low: BLINK Medium: ON High: BLINK	Loss of Temperature Feedback	1) Check the NTC terminal.

8. 8
   The malfunction can be checked by the blinking LED.
9. 9
   The seat heater unit records the malfunction that has occurred.
10. 10
    If the seat heater button is pressed for more than five seconds, the LED blinks four times, indicating a memory malfunction, and the stored memory will be deleted.
11. 11
    Pressing the ALL OFF button ends diagnostic mode for the ventilated seat.
12. 12
    You can check whether the seat heater system operates properly after pressing ALL ON. If you want to check a fault code, refer to Procedure 2 above.