Kia Optima DL3: Seat Electrical / Heated Seats Only

Kia Optima DL3 2019-2025 Service and Repair Manual / Body Electrical System / Seat Electrical / Heated Seats Only

Components and components location

Components

Front Seat Heater

1. Front seat back heater
2. Front seat cushion heater

3. Front seat heater unit / ventilation unit

Rear Seat Heater

1. Rear seat heater unit
2. Rear seat back heater

3. Rear seat cushion heater

Schematic diagrams

Connector and Terminal Function

Front Seat Heater Unit

Pin	Function	Pin	Function
1	Battery (+)	15	Battery (+)
2	Driver heater power (+)	16	Passenger heater power (+)
3	IGN1	17	IGN2
4	CAN (Low)	18	-
5	CAN (High)	19	Detent
6	-	20	Illumination (-)
7	Driver heater indicator (High)	21	Passenger heater indicator (High)
8	Driver heater indicator (Mid)	22	Passenger heater indicator (Mid)
9	Driver heater indicator (Low)	23	Passenger heater indicator (Low)
10	Driver heater switch	24	Passenger heater switch
11	Driver heater NTC (+)	25	Passenger heater NTC (+)
12	Driver heater NTC (-)	26	Passenger heater NTC (-)
13	Driver heater ground (-)	27	Passenger heater ground (-)
14	Ground	28	Ground

Front Seat Heater Unit (Ventilation seat unit)

Pin	Function
Pin	Connector A	Connector B
1	Driver heater ground (-)	Driver blower speed (+)
2	Passenger heater ground (-)	-
3	Driver cushion heater power (+)	CAN (Low)
4	Driver back heater power (+)	CAN (High)
5	Passenger cushion heater power (+)	-
6	Passenger back heater power (+)	LIN
7	ECU (Ground)	Detent
8	ECU (Ground)	IGN1
9		Driver blower speed
10		Passenger blower speed
11		Illumination (-)
12		Driver NTC (-)
13		Passenger NTC (-)
14		-
15		-
16		-
17		-
18		-
19		-
20		IGN2
21		-
22		Driver NTC (+)
23		Passenger NTC (+)
24		-

Rear Seat Heater Unit

Pin	Function	Pin	Function
1	Battery (+)	15	Battery (+)
2	Heater power (+)_LH	16	Heater power (+)_RH
3	IGN1	17	IGN2
4	CAN (Low)	18	-
5	CAN (High)	19	-
6	-	20	-
7	Heater indicator (High)_LH	21	Heater indicator (High)_RH
8	-	22	-
9	Heater indicator (Low)_LH	23	Heater indicator (Low)_RH
10	Heater switch_LH	24	Heater switch_RH
11	Heater NTC (+)_LH	25	Heater NTC (+)_RH
12	Heater NTC (-)_LH	26	Heater NTC (-)_RH
13	Heater ground (-)_LH	27	Heater ground (-)_RH
14	Ground	28	Ground

Repair procedures

Inspection

Driver/Passenger Seat Heater

Check for continuity and measure the resistance between terminals.

Pin	Function
Pin	Heater	Heater+Ventilation
1	-	NTC (+)
2	-	Back heater (-)
3	Heater (+)	NTC (-)
4	NTC (+)	Cushion heater (+)
5	NTC (-)	Back heater (+)
6	Heater (-)	Cushion/Back heater (-)

Position	NTC Sensor (± 5%)
Position	Driver	Passenger
High	2.87 kΩ	2.66 kΩ
Mid	4.25 kΩ	3.35 kΩ
Low	5.91 kΩ	5.00 kΩ

Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.

Driver/Passenger		Chusion/Back (± 2°C)
Position	High	42 / 50°C
	Mid	39 / 45°C
	Low	36 / 40°C

Rear Seat Heater

Check for continuity and measure the resistance between terminals.

Pin	Function
1	-
2	-
3	Heater (+)
4	NTC (+)
5	NTC (-)
6	Heater (-)

Position	NTC Sensor (± 5%)
High	1.52 kΩ
Low	4.08 kΩ

Operate the seat heater after connecting the connector, and then check the thermostat by measuring the temperature of seat surface.

Driver/Passenger		Chusion/Back (± 2°C)
Position	High	42 / 50°C
Position	Low	36 / 40°C

Removal

Front Seat Heater Unit

1.	Remove the passenger seat assembly. (Refer to Body - "Front Seat assembly")

2.	Disconnect the seat heater unit connector (A).

3.	Remove the front seat heater unit (A) by loosening the screws.

Rear Seat Heater Unit

1.	Disconnect the negative battery terminal.

2.	Remove the rear seat cushion assembly. (Refer to Body - "Rear Seat Assembly")

3.	Disconnect the rear seat heater unit connector (A).

4.	Remove the rear seat heater unit (A).

Installation

1.	Install in the reverse order of removal.

❮Seat Electrical

Ventilated and Heated Seat Switch❯

Schematic diagrams Connector and Terminal Function [Front Seat] [Ventilation+Heater Type / Non-Heater Type] Pin Function Pin Function Ventilation+Heater Type Non-Heater Type Ventilation+Heater Type Non-Heater Type 1 IGN1 - 9 Illumination (+) 2 - - 10 - 3 - - 11 Illumination (-) 4 Ground - 12 - 5 - 13 Steering heater mode - 6 - 14 Steering heater indicator - 7 LIN - 15 Driver mode switch (CW) 8 Ground 16 Driver mode switch (CCW) [Heater Type] Pin Function Pin Function 1 Heater indicator (High)_RH 13 Heater mode_RH 2 Heater indicator (Mid)_RH 14 - 3 Heater indicator (Low)_RH 15 - 4 - 16 Ground 5 Driver mode switch (CW) 17 - 6 Driver mode switch (CCW) 18 Illumination (-) 7 Steering heater mode 19 - 8 Steering heater indicator 20 Illumination (+) 9 Heater mode_LH 21 - 10 Heater indicator (High)_LH 22 - 11 Heater indicator (Mid)_LH 23 - 12 Heater indicator (Low)_LH 24 - [Rear Seat] [Safety Type] Pin Function Pin Function 1 Ground (Illumination -) 5 Ground 2 Door lock switch 6 Door lock indicator 3 Door unlock switch 7 Safety power window 4 Battery + (Illumination +) 8 - [Manual Type] Pin Function Pin Function 1 Ground 7 Driver window down 2 Seat warmer (High) 8 Window enble 3 Window down motor 9 Ground (Illumination -) 4 Seat warmer (Low) 10 Driver window up 5 Window up motor 11 Battery + (Illumination +) 6 Seat warmer switch 12 Battery (+) Repair procedures Inspection [Front Seat] 1.

Other information:

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