There should be an air bag disable switch usually situated in the door jamb driver side hing side check if its in off position.
Don't be tempted to carry children in front seat bag on or off. I personally think it should be law all are carried in rear seats up to an age where they wouldn't sustain inury from an air bag.
Reason: A airbag exits with such force it could injur a young child so they are better to be travelling in the rear rather than front. Its probable warning when off if someone heavy sits on the seat. Then again it might be a permanently lit warning its off.
bob, February 2012
