Hyundai Elantra: Speed sensing door lock system (if equipped) - Door locks - Features of your vehicle - Hyundai Elantra HD 2006Ц2010 Owners ManualHyundai Elantra: Speed sensing door lock system (if equipped)

When the speed of the vehicle is above approximately 12 MPH (20 km/h) for 1 second, it will automatically lock all doors. For activation of this feature, contact an authorized Hyundai dealer.