Hyundai Elantra HD: Air bag warning light
This warning light will illuminate for approximately 6 seconds each time you turn the ignition switch to the ON position.
This light also comes on when the SRS is not working properly. If the AIR BAG warning light does not come on, or continuously remains on after operating for about 6 seconds when you turned the ignition switch to the ON position or started the engine, or if it comes on while driving, have the SRS inspected by an authorized Hyundai dealer.