Hyundai Elantra (CN7): Seat Electrical / Seat Heater

Hyundai Elantra (CN7) 2021-2026 Service Manual / Body Electrical System / Seat Electrical / Seat Heater

Components and components location

Component Location
[Front Seat Heater]

1. Seat heater unit (Passenger only)
2. Seat cushion heater
3. Seat back heater

[Rear Seat Heater]

1. Seat heater unit
2. Seat cushion heater

Schematic diagrams

Circuit Diagram
[Front Seat Heater (Non-Air Ventilation)]

[Rear 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) : 1.65Ω±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 : 1.67Ω±10%/20°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 Diagnosis Mode
1.
You can enter the diagnosis mode by turning the seat heater button on.
2.
You can enter the diagnosis mode by referring to following description.
•
Push IGN ON while pressing the seat heater button from IGN OFF.
•
Keep pressing IGN ON for more than three seconds before pressing it once againe for more than three seconds within 2 seconds.
•
All LED indicators on the driver and passenger seat button will blink 1 times.
3.
After entering the diagnosis mode, you can check what failed by checking the blinking LED.
[Driver / Passenger Seat Heater]

Failure Indicator
Inspection Items
Detailed Inspections
Low : OFF
Mid : OFF
High : FLASHING
Low voltage detection
–
IGN1 voltage of 8.5 V or lower
Over voltage detection
–
IGN1 voltage of 16.5 V or lower
Low : FLASHING
Mid : FLASHING
High : FLASHING
Fuse (Short)
–
Disconnection or missing connector of heating seat B(+) line
Low : OFF
Mid : ON
High : FLASHING
NTC (Short / Disconnector)
–
NTC element failure
–
Short-circuit between NTC connector terminals
–
Disconnection in the NTC (+) wiring
–
Disconnection in the NTC (-) wiring
Low : FLASHING
Mid : FLASHING
High : FLASHING
Heater (Short / Disconnector)
–
Heating wire element failure
–
Short-circuit between heating wire connector terminals
–
Disconnection in the heating wire (+)
–
Disconnection in the heating wire (-)
Low : ON
Mid : ON
High : FLASHING
Loss of temperature feedback
–
Target temperature not reached within 40 minutes

[Rear Seat He7ater]

Failure Indicator
Inspection Items
Detailed Inspections
Low : OFF
High : OFF
Low voltage detection
–
IGN1 voltage of 8.5 V or lower
Over voltage detection
–
IGN1 voltage of 16.5 V or lower
Low : FLASHING
High : FLASHING
Fuse (Short)
–
Disconnection or missing connector of heating seat B(+) line
Low : OFF
High : FLASHING
NTC (Short / Disconnector)
–
NTC element failure
–
Short-circuit between NTC connector terminals
–
Disconnection in the NTC (+) wiring
–
Disconnection in the NTC (-) wiring
Low : FLASHING
High : FLASHING
Heater (Short / Disconnector)
–
Heating wire element failure
–
Short-circuit between heating wire connector terminals
–
Disconnection in the heating wire (+)
–
Disconnection in the heating wire (-)
Low : ON
High : FLASHING
Loss of temperature feedback
–
Target temperature not reached within 40 minutes

4.
You can check the malfunctioning by checking the blinking LED.
5.
Pressing the IGN OFF button will end the diagnosis mode for the heater seat.
6.
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.

    Repair procedures Removal1.Disconnect the negative (-) battery terminal.2.Remove the front seat outer shield cover.(Refer to Body - "Front Seat Outer Shield Cover")3.

    Components and components location Components1. Driver seat heater switch2. Passenger seat heater swtich3. 2nd seat heater switch Schematic diagrams Circuit DiagramManual Seat Heater SwitchConnector Pin Information[Connector A] Pin No Function Pin No Function 1Low (Register specifications)4Middle Low (Register specifications)2Common (Register specifications)5Middle High (Register specifications)3Ground (Register specifications)6High (Register specifications)[Connector B] Pin No Function Pin No Function 1Battery (+)21IGN22ISG B+22IGN13ILL+ (TAIL)23Blower IS (PWM specifications)4Sensor REF (+5V)24-5Mode control actuator (Feedback)25-6Temperature control actuator (Feedback)26-7Intake actuator (Feedback)27Blower Max.

    Other information:

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Heater Unit

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    Hyundai Elantra (CN7) 2021-2026 Service Manual: Description and operation

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