Hyundai Elantra: Seat Electrical / Seat Heater Switch

Hyundai Elantra (CN7) 2021-2025 Service Manual / Body Electrical System / Seat Electrical / Seat Heater Switch

Components and components location

Components

1. Driver seat heater switch 2. Passenger seat heater swtich	3. 2nd seat heater switch

Schematic diagrams

Circuit Diagram

Manual Seat Heater Switch

Connector Pin Information

[Connector A]

Pin No	Function	Pin No	Function
1	Low (Register specifications)	4	Middle Low (Register specifications)
2	Common (Register specifications)	5	Middle High (Register specifications)
3	Ground (Register specifications)	6	High (Register specifications)

[Connector B]

Pin No	Function	Pin No	Function
1	Battery (+)	21	IGN2
2	ISG B+	22	IGN1
3	ILL+ (TAIL)	23	Blower IS (PWM specifications)
4	Sensor REF (+5V)	24	-
5	Mode control actuator (Feedback)	25	-
6	Temperature control actuator (Feedback)	26	-
7	Intake actuator (Feedback)	27	Blower Max. On signal (Register specifications)
8	EVAP sensor (+)	28	-
9	AMB sensor (+)	29	PTC relay
10	Mode control actuator (Vent)	30	-
11	Mode control actuator (DEF)	31	-
12	Temperature control actuator (Cool)	32	-
13	Temperature control actuator (Warm)	33	P_CAN High
14	Intake actuator (FRE)	34	P_CAN Low
15	Intake actuator (REC)	35	Blower INH (PWM specifications)
16	HDT	36	Blower PWM (In) (PWM specifications)
17	-	37	ECV (+)
18	-	38	ECV (-)
19	Blower signal (On) (Register specifications)	39	Sensor ground
20	ILL- (RHEO)	40	Ground

DATC Seat Heater Switch

[Connector A]

Pin No	Function	Pin No	Function
1	Battery	9	IGN2
2	ILL+ (TAIL)	10	ISG Battery (+)
3	-	11	IGN1
4	LIN BUS	12	HTD
5	-	13	-
6	-	14	-
7	-	15	-
8	RHEO (ILL-)	16	Ground

[Rear Seat]

Repair procedures

Removal

[Manual Seat Heater Switch]

1.	Disconnect the negative (-) battery terminal.

2.	Remove heater & A/C control unt. (Refer to Heating, Ventilation and Air Conditioning - "Heater & A/C Control Unit (Manual")

[DATC Seat Heater Switch]

1.	Disconnect the negative (-) battery terminal.

2.	Remove heater & A/C control unt. (Refer to Heating, Ventilation and Air Conditioning - "Heater & A/C Control Unit (DATC")

[Rear Seat]

1.	Disconnect the negative (-) battery terminal.

2.	Remove the rear door window switch. (Refer to Power Windows - "Power Window Switch")

Installation

1.	Install the heater & A/C control unt.

2.	Connect the negative (-) battery terminal.

[Rear Seat Heater Switch]

1.	Install the rear door window switch.

2.	Connect the negative (-) battery terminal.

Seat Heater

Components and components location Component Location[Front Seat Heater]1. Seat heater unit (Passenger only) 2. Seat cushion heater3. Seat back heater[Rear Seat Heater]1...

Components and components location Component Location[Front Ventilation Seat]1. Ventilation seat blower2.Ventilation seat unit Schematic diagrams Circuit DiagramConnector Pin Information Pin no Connector A Connector B Connector C 1Ventilation seat unit IGN 1 Ventilation heater pow..

Other information:

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Function malfunction and limitations

Function malfunction

When High Beam Assist is not working properly, the ‘Check High Beam Assist (HBA) system’ or ‘Check HBA (High Beam Assist) system’ warning message will appear and warning light will illuminate on the cluster. Take your vehicle to an authorized HYUNDAI dealer and have the function checked.