Central Door Locking System
This system controls the passenger door locks from the driver's door lock. When the driver's door lock is locked, the passenger door locks are automatically locked. If a rear door is open when the door lock interior button is pressed, the door will be locked after it is closed.
If a front door is open when the door lock interior button is pressed, hold the outside door handle in the raised position. After the door is closed, its lock will be locked. All door locks are automatically unlocked when the driver's door is unlocked with the key or with the driver's door lock interior button.

When the driver's door is unlocked using the door lock interior button, all door locks are automatically unlocked.
Test yourself
A quick Hyundai Accent quiz: every answer comes with an explanation and a link to the manual page.