An airbag warning light indicates an issue with the airbag. It may mean that the system cannot deploy the airbag, or it may indicate failure to reset the airbag properly after deployment. If the light stays on while the car runs, a professional should examine the system.
A mechanic can run a diagnostic test on the airbag's electronic control unit to find the problem's source. The light may indicate some form of computer problem or an issue with the airbags themselves. Clearing the electronic control unit is necessary before technicians can turn off the light, which is a service that various companies provide. CarsDirect.com recommends avoiding driving while the light is on, as this indicates the airbag's inability to deploy during a crash.