Possible Causes

WARNING: This page is about a different car, the 2001 Dodge Viper and 2000 Dodge Viper. However, it is still accessible from the selected car via links, so may be relevant.

Airbag Lamp
Fused Ignition Switch Output Run/Start Circuit Open-To-Message Center
Message Center Airbag Lamp
Airbag Warning Lamp Driver Shorted-To-Battery
Airbag Warning Lamp Driver Short-To-Ground
Airbag Warning Lamp Driver Circuit Open
ACM, Warning Lamp Driver Open/Shorted