Kia Optima DL3 Quiz
Body Electrical System

Heated seats only

In this manual: Body Electrical System
General Information — 8Advanced Driver Assistance System (ADAS) — 21Maintenance — 27Engine Mechanical System — 45Engine Electrical System — 11Emission Control System — 11Engine Control System/Fuel System — 25Automatic Transmission — 20Drive Shaft and Axle — 7Suspension System — 22Steering — 7Restraints — 11Brake System — 22Body (Interior and Exterior) — 116Body Electrical System — 90Heating, Ventilation, and Air Conditioning — 32
11steps
~66min
3/5difficulty
Done 0 of 11

Components and Component Location

Components

Front Seat Heater

1. Front seat back heater
2. Front seat cushion heater		 3. Front seat heater/ventilation unit

Rear Seat Heater

1. Rear seat heater unit
2. Rear seat back heater		 3. Rear seat cushion heater.

Circuit 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 Latch
6 - 20 Illumination (-)
7 Driver heater indicator (high) 21 Passenger heater indicator (high)
8 Driver heater indicator (medium) 22 Passenger heater indicator (medium)
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 (Ventilated seat)

Pin Function
Connector A Connector B
1 Driver heater ground (-) Driver fan 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) Latch
8 ECU (ground) IGN1
9 Driver Fan Speed
10 Passenger Fan Speed
11 Illumination (-)
12 Driver NTC (-)
13 Passenger NTC (-)
14 -
15 -
16 -
17 -
18 -
19 -
20 IGN2
21 -
22 NTC Driver (+)
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 continuity and measure the resistance between the terminals.

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

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

  2. Turn on the seat heater after connecting the connector, then check the thermostat by measuring the seat surface temperature.

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

Rear Seat Heater

  1. Check continuity and measure the resistance between the 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. Turn on the seat heater after connecting the connector, then check the thermostat by measuring the seat surface temperature.

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

Removal

Front Seat Heater Unit

  1. Remove the front passenger seat assembly.

    (Refer to Body - "Front Seat Assembly")

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

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

Rear Seat Heater Unit

  1. Disconnect the negative battery cable.

  2. Remove the rear seat cushion assembly.

    (See 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.

Test yourself

A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.