Kia Optima: Auto door lock/unlock feature (if equipped)

Impact sensing door unlock system (if equipped)

All doors will automatically unlock when an impact causes the air bags to deploy. ...

Speed sensing door lock system (if equipped)

All doors will be automatically locked after the vehicle speed exceeds 15 km/h (9.3 mi/h). And all doors will be automatically unlocked when you turn the engine off or when you remove the ignition ...

See also:

Removal
[Bank 1 / Intake] 1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2. Remove the OTS (A). 3. Disco ...

Schedule 1 - Severe Maintenance
I: Inspect and, if necessary, adjust, correct, clean or replace. R: Replace or change. ...

To Reset at a Slower Speed
1. Press the COAST/SET switch and hold it. While the switch is pressed, the vehicle speed will gradually decrease. 2. When the desired speed is obtained, release the COAST/SET switch. ✽ N ...