Didnt drive van for 3 days and the battery went low/ Got a jump amd now the air bag light is on?

What couyld caused this?

 

If the battery died in 3 days and nothing was left on, you probably should get the battery tested/replaced. It is well known that cars these days will show many problems with a simple electrical problem like the battery being bad.

 

Guess i forgot to mention. The battery has been replaced.

 

You may want to ck the system for a draw. Make sure the glove box lite is not on. And you will need a starscan to reset the code.