Kia Optima: Headrest
The rear seat(s) is equipped with headrests in the outboard seating positions for the occupant's safety and comfort.
The headrest not only provides comfort for passengers, but also helps protect the head and neck in the event of a collision.
WARNING

Adjusting the height up and down
To raise the headrest, pull it up to the desired position (1). To lower the headrest, push and hold the release button (2) on the headrest support and lower the headrest to the desired position (3).

Removal
To remove the headrest, raise it as far as it can go then press the release button (1) while pulling the headrest upward (2). To reinstall the headrest, put the headrest poles (3) into the holes while pressing the release button (1). Then adjust it to the appropriate height.
WARNING
Make sure the headrest locks in position after adjusting it to properly protect the occupants.
Folding the rear seat
Seat warmer (if equipped)Immobilizer system (if equipped)
Your vehicle may be equipped with an electronic engine immobilizer system to
reduce the risk of unauthorized vehicle use.
Your immobilizer system is comprised of a small transponder in the ignition ...
Purge Control Solenoid Valve (PCSV). Specifications
Specification
Item
Specification
Coil Resistance (Ω)
19.0 ~ 22.0 [20°C(68°F)]
...
Installation
[Front Seat]
1.
Install the connectors and air
ventilation control unit.
2.
Install the air ventilation duct
and blower.
3.
Install the seat back cover ...