Kia Optima: Seat Electrical / Heated Seats Only

Kia Optima DL3 2019-2020 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
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

1.

Check for continuity and measure the resistance between terminals.

Pin
Function
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%)
Driver
Passenger
High
2.87 kΩ
2.66 kΩ
Mid
4.25 kΩ
3.35 kΩ
Low
5.91 kΩ
5.00 kΩ

2.

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

1.

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

2.

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
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
...

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