Hyundai Elantra (CN7): 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.

Air Ventilation Seat❯

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 power blower ground2Driver blower powerDriver heater power - 3Driver blower sppedPassenger heater power blower VSP4Driver RPM input- blower F/B5Illumination (+)Driver heater ground blower VCC6-Driver ventilation heater ground 7CAN LowDriver ventilation power8CAN High- 9- - 10LIN- 11- Passenger heater ground12Driver blower groundVentilation heater ground13Ventilation seat unit IGN 1 14Passenger blower power15Passenger blower speed16Passenger blower RPM input 17Illumination (-)18Detent19-20Driver NTC (+) 21Passenger NTC (+) 22Passenger NTC (-) 23Driver NTC (-) 24Passenger blower ground Repair procedures Removal[Ventilation Blower]1.

Other information:

Hyundai Elantra (CN7) 2021-2025 Service Manual: Description and operation

DescriptionSystem OverviewThe System offers the following features:– Human / machine interface through a 1-stage button, for terminal switching and engine start.– Control of external relays for ACC / IGN1 / IGN2 terminal switching and STARTER, without use of mechanical ignition switch.