SM:
You have a charging problem with your vehicle. the battery is losing power and the charging system is not recharging it properly. Once you get that fixed you will have to reset the airbag light independently.
This website gives you the procedure for diagnosing and resetting airbag lights. Although it’s a pay site ($14.95/day), it’s a lot cheaper than going to the dealer
http://www.airbagsolutions.com/