The airbag light in your vehicle comes on when there is a malfunction in the airbag supplemental restraint system, or SRS. This system must be checked by a professional mechanic. Many times, when the airbag is malfunctioning, the only remedy is to replace the entire unit. Replacement of the unit will ensure that the airbag does not deploy prematurely (or not at all) during a car accident. Once the airbag has been replaced, you need to reset the airbag light module.
Open the fuse panel cover in the driver's side footwell by pulling down on it by hand.
Locate the yellow connector plugged into the fuse panel. This is the SRS power connector.
Pull the connector out of the fuse panel.
Unbend a paper clip and insert one end into each of the terminals on the end of the SRS plug.
Turn the ignition to the "On" position but do not start the vehicle. The two terminals on the airbag power connector will be connected via the paper clip. When power is supplied to the connected terminals ("jumping the terminals"), the airbag light will reset. The voltage is low enough that you don't need to be worried about an electrical shock.
Reconnect the SRS power connector to the fuse panel.